CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))]

Step	Inspection	Action
1	INSPECT IF COMMUNICATION BETWEEN M-MDS AND PCM IS POSSIBLE • Connect the M-MDS (IDS) to the DLC-2. • Switch the ignition ON. • Perform vehicle identification. • Can the vehicle be identified?	Yes	Go to the next step.
No	Go to Step 5 as a malfunction in the HS-CAN circuit has occurred.
2	INSPECT MODULE FOR INABILITY TO COMMUNICATE DUE TO CAN MALFUNCTION • Implement the network test using the M-MDS (IDS). (See NETWORK TEST [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].) • Is there a module indicating a malfunction?	Yes	Go to Step 14 as a malfunction in the CAN circuit has occurred.
No	Go to the next step.
3	INSPECT FOR SHORT TO POWER SUPPLY IN HS-CAN OR CAN_H SIDE OF MS-CAN • Measure the voltage between the following terminals: ― Between DLC-2 terminal F (CAN_H side of HS CAN) and body ground ― Between DLC-2 terminal L (CAN_H side of MS CAN) and body ground Note • Determination by the voltage value is difficult, refer to "HS-CAN signal waveform" or "MS-CAN signal waveform", and determine by comparing the normal value of the signal waveform with the measured value. • Is B+ voltage measured between any of the terminals? Note • If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured. If a constant voltage other than B+ is measured, refer to "HS-CAN signal waveform" or "MS-CAN signal waveform", and if it can be verified that the signal waveform has the same features as the signal waveform which occurs during a short to power supply, proceed to Yes.	Yes	A short to power supply in the HS-CAN or the CAN_H side of the MS-CAN has occurred. Determine the location of the short to power supply according to the diagnosis procedure for determining the location of a short to power supply. (See DETERMINING SHORT TO POWER SUPPLY LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].) (See DETERMINING SHORT TO POWER SUPPLY LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
No	Go to the next step.
4	INSPECT FOR SHORT TO GROUND IN CAN_L SIDE OF HS-CAN OR MS-CAN • Measure the voltage between the following terminals: ― Between DLC-2 terminal E (CAN_L side of HS-CAN) and ground ― Between DLC-2 terminal K (CAN_L side of MS-CAN) and ground Note • Determination by the voltage value is difficult, refer to "HS-CAN signal waveform" or "MS-CAN signal waveform", and determine by comparing the normal value of the signal waveform with the measured value. • Is the voltage measured as 0 V?	Yes	A short to ground on the CAN_L side of the HS-CAN or MS-CAN has occurred. Determine the location of the short to ground according to the diagnosis procedure for determining the location of a short to ground. (See DETERMINING SHORT TO GROUND LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].) (See DETERMINING SHORT TO GROUND LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
No	The current CAN circuit is normal, return to FOREWARD, and go to the next step of the CAN malfunction diagnosis in the troubleshooting procedure. (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))]"/>.)
5	VERIFY IF VEHICLE UNDER DIAGNOSIS IS EQUIPPED WITH ADVANCED PUSH START SYSTEM. • Is the vehicle equipped with the advanced push start system?	Yes	Go to the next step.
No	Go to Step 7.
6	VERIFY IF ADVANCED PUSH START SYSTEM HAS MALFUNCTION • Switch the ignition ON. • Can the ignition be switched ON?	Yes	Go to the next step.
No	A malfunction in the advanced push start system has occurred. Perform diagnosis according to the symptom troubleshooting.
7	INSPECT FOR MALFUNCTION IN M-MDS • Connect the M-MDS (IDS) to a normal vehicle and implement vehicle identification. • Can the vehicle be identified?	Yes	Go to the next step.
No	A malfunction in the M-MDS (IDS) can be considered. Repair the M-MDS (IDS).
8	INSPECT HS-CAN CIRCUIT FOR SHORT TO POWER SUPPLY • Measure the voltage between the following terminals: ― Between DLC-2 terminal F (CAN_H side) and body ground ― Between DLC-2 terminal E (CAN_L side) and body ground Note • Determination by the voltage value is difficult, refer to "HS-CAN signal waveform", and determine by comparing the normal value of the HS-CAN signal waveform with the measured value. • Is B+ voltage measured between any of the terminals? Note • If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured. If a constant voltage other than B+ is measured, refer to "MS-CAN signal waveform", and if it can be verified that the signal waveform has the same features as the signal waveform which occurs during a short circuit to power supply, proceed to Yes.	Yes	A short to power supply in the CAN_H side or CAN_L of HS-CAN has occurred. Determine the location of the short to power supply according to the diagnosis procedure for determining the location of a short to power supply. (See DETERMINING SHORT TO POWER SUPPLY LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
No	Go to the next step.
9	INSPECT HS-CAN CIRCUIT FOR OPEN CIRCUIT • Measure the voltage between the following terminals: ― Between DLC-2 terminal F (CAN_H side) and body ground ― Between DLC-2 terminal E (CAN_L side) and body ground Note • Determination by the voltage value is difficult, refer to "HS-CAN signal waveform", and determine by comparing the normal value of the HS-CAN signal waveform with the measured value. • Is the voltage between both terminals (CAN_H side and CAN_L side) equal?	Yes	Go to Step 13 as a short to ground or a short between circuits has occurred in the HS-CAN.
No	Go to the next step.
10	VERIFY IF VEHICLE UNDER DIAGNOSIS IS EQUIPPED WITH IMMOBILIZER SYSTEM • Is the vehicle equipped with the immobilizer system?	Yes	Go to the next step.
No	Go to Step 12.
11	DETERMINE IF OPEN CIRCUIT LOCATION IN HS-CAN CIRCUIT IS BETWEEN DLC AND BRANCH E OR ELSEWHERE • Start the engine. • Can the engine be started?	Yes	Go to Step 12.
No	An open circuit has occurred between the PCM and branch E in the HS-CAN. Determine the location of the open circuit according to the diagnosis procedure for determining the location of an open circuit. (See DETERMINING OPEN CIRCUIT LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
12	DETERMINE IF OPEN CIRCUIT LOCATION IN HS-CAN CIRCUIT IS BETWEEN DLC AND BRANCH E OR ELSEWHERE • Switch the ignition ON. • Verify if the check engine light in the instrument cluster illuminates. • Start the engine. • Verify if the check engine light turns off. • Does the check engine light turn off?	Yes	An open circuit between DLC-2 and branch E has occurred. Repair or replace the wiring harness for an open circuit, then return to Step 1.
No	An open circuit has occurred between the PCM and branch E in the HS-CAN. Determine the location of the open circuit according to the diagnosis procedure for determining the location of an open circuit. (See DETERMINING OPEN CIRCUIT LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
13	VERIFY MALFUNCTION OCCURED IN HS-CAN CIRCUIT • Measure the voltage between the following terminals: ― Between DLC-2 terminal F (CAN_H side) and body ground ― Between DLC-2 terminal E (CAN_L side) and body ground Note • Determination by the voltage value is difficult, refer to "HS-CAN signal waveform", and determine by comparing the normal value of the HS-CAN signal waveform with the measured value. • Is the voltage between both terminals (CAN_H side and CAN_L side) 0 V?	Yes	A short to ground in CAN_H side of HS-CAN has occurred. Determine the location of the short to ground according to the diagnosis procedure for determining the location of a short to ground. (See DETERMINING SHORT TO GROUND LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
No	A short between circuits in the CAN_H side and the CAN_L side of HS-CAN has occurred. Determine the location of the short between circuits according to the diagnosis procedure for determining the location of a short between circuits. (See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
14	DETERMINE CAN COMMUNICATION SPECIFICATION IN WHICH MALFUNCTION OCCURS • Refer to the CAN communication specification quick reference table and verify the CAN communication specification (HS-CAN or MS-CAN) that is connected to the module which is indicating a malfunction. (See CAN communication specification quick reference table.) • Is the module that is indicating a malfunction HS-CAN?	Yes	An open circuit in the HS-CAN has occurred. Determine the location of the open circuit according to the diagnosis procedure for determining the location of an open circuit. (See DETERMINING OPEN CIRCUIT LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
No	Go to the next step.
15	INSPECT FOR SHORT TO POWER SUPPLY IN CAN_L SIDE OF MS-CAN • Measure voltage between DLC-2 terminal K (CAN_L side) and body ground. Note • Determination by the voltage value is difficult, refer to "MS-CAN signal waveform", and determine by comparing the normal value of the MS-CAN signal waveform with the measured value. • Can B+ voltage be measured? Note • If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured. If a constant voltage other than B+ is measured, refer to "MS-CAN signal waveform", and if it can be verified that the signal waveform has the same features as the signal waveform which occurs during a short circuit to power supply, proceed to Yes.	Yes	A short to power supply in the CAN_L side of the MS-CAN has occurred. Determine the location of the short to power supply according to the diagnosis procedure for determining the location of a short to power supply. (See DETERMINING SHORT TO POWER SUPPLY LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
No	Go to the next step.
16	INSPECT FOR OPEN CIRCUIT IN MS-CAN • Measure the voltage between the following terminals: ― Between DLC-2 terminal L (CAN_H side) and body ground ― Between DLC-2 terminal K (CAN_L side) and body ground Note • Determination by the voltage value is difficult, refer to "MS-CAN signal waveform", and determine by comparing the normal value of the MS-CAN signal waveform with the measured value. • Is the voltage between both terminals (CAN_H side and CAN_L side) equal?	Yes	Go to the next step.
No	Open circuit in MS-CAN has occurred. Determine the location of the open circuit according to the diagnosis procedure for determining the location of an open circuit. (See DETERMINING OPEN CIRCUIT LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
17	VERIFY MALFUNCTION OCCURRED IN MS-CAN • Measure the voltage between the following terminals: ― Between DLC-2 terminal L (CAN_H side) and body ground ― Between DLC-2 terminal K (CAN_L side) and body ground Note • Determination by the voltage value is difficult, refer to "MS-CAN signal waveform", and determine by comparing the normal value of the MS-CAN signal waveform with the measured value. • Is the voltage between both terminals (CAN_H side and CAN_L side) equal?	Yes	A short to ground in the CAN_H side of the MS-CAN has occurred. Determine the location of the short to ground according to the diagnosis procedure for determining the location of a short to ground. (See DETERMINING SHORT TO GROUND LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
No	A short between circuits on the CAN_H side and CAN_L side of MS-CAN has occurred. Determine the location of the short between circuits according to the diagnosis procedure for determining the location of a short between circuits. (See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

Step

Inspection

Action

INSPECT IF COMMUNICATION BETWEEN M-MDS AND PCM IS POSSIBLE

• Connect the M-MDS (IDS) to the DLC-2.

• Switch the ignition ON.

• Perform vehicle identification.

• Can the vehicle be identified?

Yes

Go to the next step.

Go to Step 5 as a malfunction in the HS-CAN circuit has occurred.

INSPECT MODULE FOR INABILITY TO COMMUNICATE DUE TO CAN MALFUNCTION

• Implement the network test using the M-MDS (IDS).

(See NETWORK TEST [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

• Is there a module indicating a malfunction?

Yes

Go to Step 14 as a malfunction in the CAN circuit has occurred.

Go to the next step.

INSPECT FOR SHORT TO POWER SUPPLY IN HS-CAN OR CAN_H SIDE OF MS-CAN

• Measure the voltage between the following terminals:

― Between DLC-2 terminal F (CAN_H side of HS CAN) and body ground

― Between DLC-2 terminal L (CAN_H side of MS CAN) and body ground

Note

• Determination by the voltage value is difficult, refer to "HS-CAN signal waveform" or "MS-CAN signal waveform", and determine by comparing the normal value of the signal waveform with the measured value.

• Is B+ voltage measured between any of the terminals?

Note

• If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured. If a constant voltage other than B+ is measured, refer to "HS-CAN signal waveform" or "MS-CAN signal waveform", and if it can be verified that the signal waveform has the same features as the signal waveform which occurs during a short to power supply, proceed to Yes.

Yes

A short to power supply in the HS-CAN or the CAN_H side of the MS-CAN has occurred.

Determine the location of the short to power supply according to the diagnosis procedure for determining the location of a short to power supply.

(See DETERMINING SHORT TO POWER SUPPLY LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

(See DETERMINING SHORT TO POWER SUPPLY LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

Go to the next step.

INSPECT FOR SHORT TO GROUND IN CAN_L SIDE OF HS-CAN OR MS-CAN

• Measure the voltage between the following terminals:

― Between DLC-2 terminal E (CAN_L side of HS-CAN) and ground

― Between DLC-2 terminal K (CAN_L side of MS-CAN) and ground

Note

• Is the voltage measured as 0 V?

Yes

A short to ground on the CAN_L side of the HS-CAN or MS-CAN has occurred.

Determine the location of the short to ground according to the diagnosis procedure for determining the location of a short to ground.

(See DETERMINING SHORT TO GROUND LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

(See DETERMINING SHORT TO GROUND LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

The current CAN circuit is normal, return to FOREWARD, and go to the next step of the CAN malfunction diagnosis in the troubleshooting procedure.

(See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))]"/>.)

VERIFY IF VEHICLE UNDER DIAGNOSIS IS EQUIPPED WITH ADVANCED PUSH START SYSTEM.

• Is the vehicle equipped with the advanced push start system?

Yes

Go to the next step.

Go to Step 7.

VERIFY IF ADVANCED PUSH START SYSTEM HAS MALFUNCTION

• Switch the ignition ON.

• Can the ignition be switched ON?

Yes

Go to the next step.

A malfunction in the advanced push start system has occurred.

Perform diagnosis according to the symptom troubleshooting.

INSPECT FOR MALFUNCTION IN M-MDS

• Connect the M-MDS (IDS) to a normal vehicle and implement vehicle identification.

• Can the vehicle be identified?

Yes

Go to the next step.

A malfunction in the M-MDS (IDS) can be considered.

Repair the M-MDS (IDS).

INSPECT HS-CAN CIRCUIT FOR SHORT TO POWER SUPPLY

• Measure the voltage between the following terminals:

― Between DLC-2 terminal F (CAN_H side) and body ground

― Between DLC-2 terminal E (CAN_L side) and body ground

Note

• Determination by the voltage value is difficult, refer to "HS-CAN signal waveform", and determine by comparing the normal value of the HS-CAN signal waveform with the measured value.

• Is B+ voltage measured between any of the terminals?

Note

• If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured. If a constant voltage other than B+ is measured, refer to "MS-CAN signal waveform", and if it can be verified that the signal waveform has the same features as the signal waveform which occurs during a short circuit to power supply, proceed to Yes.

Yes

A short to power supply in the CAN_H side or CAN_L of HS-CAN has occurred.

Determine the location of the short to power supply according to the diagnosis procedure for determining the location of a short to power supply.

(See DETERMINING SHORT TO POWER SUPPLY LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

Go to the next step.

INSPECT HS-CAN CIRCUIT FOR OPEN CIRCUIT

• Measure the voltage between the following terminals:

― Between DLC-2 terminal F (CAN_H side) and body ground

― Between DLC-2 terminal E (CAN_L side) and body ground

Note

• Determination by the voltage value is difficult, refer to "HS-CAN signal waveform", and determine by comparing the normal value of the HS-CAN signal waveform with the measured value.

• Is the voltage between both terminals (CAN_H side and CAN_L side) equal?

Yes

Go to Step 13 as a short to ground or a short between circuits has occurred in the HS-CAN.

Go to the next step.

VERIFY IF VEHICLE UNDER DIAGNOSIS IS EQUIPPED WITH IMMOBILIZER SYSTEM

• Is the vehicle equipped with the immobilizer system?

Yes

Go to the next step.

Go to Step 12.

DETERMINE IF OPEN CIRCUIT LOCATION IN HS-CAN CIRCUIT IS BETWEEN DLC AND BRANCH E OR ELSEWHERE

• Start the engine.

• Can the engine be started?

Yes

Go to Step 12.

An open circuit has occurred between the PCM and branch E in the HS-CAN.

Determine the location of the open circuit according to the diagnosis procedure for determining the location of an open circuit.

(See DETERMINING OPEN CIRCUIT LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

DETERMINE IF OPEN CIRCUIT LOCATION IN HS-CAN CIRCUIT IS BETWEEN DLC AND BRANCH E OR ELSEWHERE

• Switch the ignition ON.

• Verify if the check engine light in the instrument cluster illuminates.

• Start the engine.

• Verify if the check engine light turns off.

• Does the check engine light turn off?

Yes

An open circuit between DLC-2 and branch E has occurred.

Repair or replace the wiring harness for an open circuit, then return to Step 1.

An open circuit has occurred between the PCM and branch E in the HS-CAN.

Determine the location of the open circuit according to the diagnosis procedure for determining the location of an open circuit.

(See DETERMINING OPEN CIRCUIT LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

VERIFY MALFUNCTION OCCURED IN HS-CAN CIRCUIT

• Measure the voltage between the following terminals:

― Between DLC-2 terminal F (CAN_H side) and body ground

― Between DLC-2 terminal E (CAN_L side) and body ground

Note

• Determination by the voltage value is difficult, refer to "HS-CAN signal waveform", and determine by comparing the normal value of the HS-CAN signal waveform with the measured value.

• Is the voltage between both terminals (CAN_H side and CAN_L side) 0 V?

Yes

A short to ground in CAN_H side of HS-CAN has occurred.

Determine the location of the short to ground according to the diagnosis procedure for determining the location of a short to ground.

(See DETERMINING SHORT TO GROUND LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

A short between circuits in the CAN_H side and the CAN_L side of HS-CAN has occurred.

Determine the location of the short between circuits according to the diagnosis procedure for determining the location of a short between circuits.

(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

DETERMINE CAN COMMUNICATION SPECIFICATION IN WHICH MALFUNCTION OCCURS

• Refer to the CAN communication specification quick reference table and verify the CAN communication specification (HS-CAN or MS-CAN) that is connected to the module which is indicating a malfunction.

(See CAN communication specification quick reference table.)

• Is the module that is indicating a malfunction HS-CAN?

Yes

An open circuit in the HS-CAN has occurred.

Determine the location of the open circuit according to the diagnosis procedure for determining the location of an open circuit.

(See DETERMINING OPEN CIRCUIT LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

Go to the next step.

INSPECT FOR SHORT TO POWER SUPPLY IN CAN_L SIDE OF MS-CAN

• Measure voltage between DLC-2 terminal K (CAN_L side) and body ground.

Note

• Determination by the voltage value is difficult, refer to "MS-CAN signal waveform", and determine by comparing the normal value of the MS-CAN signal waveform with the measured value.

• Can B+ voltage be measured?

Note

Yes

A short to power supply in the CAN_L side of the MS-CAN has occurred.

Determine the location of the short to power supply according to the diagnosis procedure for determining the location of a short to power supply.

(See DETERMINING SHORT TO POWER SUPPLY LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

Go to the next step.

INSPECT FOR OPEN CIRCUIT IN MS-CAN

• Measure the voltage between the following terminals:

― Between DLC-2 terminal L (CAN_H side) and body ground

― Between DLC-2 terminal K (CAN_L side) and body ground

Note

• Determination by the voltage value is difficult, refer to "MS-CAN signal waveform", and determine by comparing the normal value of the MS-CAN signal waveform with the measured value.

• Is the voltage between both terminals (CAN_H side and CAN_L side) equal?

Yes

Go to the next step.

Open circuit in MS-CAN has occurred.

Determine the location of the open circuit according to the diagnosis procedure for determining the location of an open circuit.

(See DETERMINING OPEN CIRCUIT LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

VERIFY MALFUNCTION OCCURRED IN MS-CAN

• Measure the voltage between the following terminals:

― Between DLC-2 terminal L (CAN_H side) and body ground

― Between DLC-2 terminal K (CAN_L side) and body ground

Note

• Determination by the voltage value is difficult, refer to "MS-CAN signal waveform", and determine by comparing the normal value of the MS-CAN signal waveform with the measured value.

• Is the voltage between both terminals (CAN_H side and CAN_L side) equal?

Yes

A short to ground in the CAN_H side of the MS-CAN has occurred.

Determine the location of the short to ground according to the diagnosis procedure for determining the location of a short to ground.

(See DETERMINING SHORT TO GROUND LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

A short between circuits on the CAN_H side and CAN_L side of MS-CAN has occurred.

Determine the location of the short between circuits according to the diagnosis procedure for determining the location of a short between circuits.

(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)

CAN communication related module (M-MDS display)	CAN communication specification
PCM (PCM)	×
TCM (TCM)	×
EHPAS control module (EPS)	×
DSC HU/CM (ABS) (with DSC)	×
ABS HU/CM (ABS) (with ABS)	×
BCM (BCM)	×
Rear vehicle monitoring control module (RH) (RVM)	×
SAS control module (RCM)	×
Keyless control module (RKE)	×
AFS control module (AFS)	×
Instrument cluster (IC)	×
Multi information display/information display (MID)		×
Bluetooth unit		×
Climate control unit (EATC)		×
Audio unit (ACU)		×

CAN communication related module (M-MDS display)

CAN communication specification

HS-CAN

MS-CAN

PCM (PCM)

TCM (TCM)

EHPAS control module (EPS)

DSC HU/CM (ABS) (with DSC)

ABS HU/CM (ABS) (with ABS)

BCM (BCM)

Rear vehicle monitoring control module (RH) (RVM)

SAS control module (RCM)

Keyless control module (RKE)

AFS control module (AFS)

Instrument cluster (IC)

Multi information display/information display (MID)

Bluetooth unit

Climate control unit (EATC)

Audio unit (ACU)

CAN circuit condition	CAN communication specification	Special Features
Normal	CAN_H	-
• Connection terminal: DLC-2: terminal F (+) ↔ body ground ( -) • Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
CAN_L	-
• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
Short to power supply on CAN_H side	CAN_H	• B+ constant voltage. Note • If a short to power supply other than B+ power supply occurs, it shows the voltage of the shorted power supply.
• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - ) • Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range
CAN_L	• Waveform with maximum voltage at B+. Note • If a short to ground other than the B+ power supply occurs, it shows a waveform with the maximum voltage of the shorted power supply voltage.
• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - ) • Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range
Short to power supply on CAN_L side	CAN_H	• B+ constant voltage. Note • If a short to power supply other than B+ power supply occurs, it shows the voltage of the shorted power supply.
CAN_L	• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - ) • CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - ) • 2 V/DIV (Y), 5 ms/DIV (X), DC range
Short to ground on CAN_H side	CAN_H	CAN_H side, CAN_L side: 0 V constant voltage.
CAN_L	• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - ) • CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
Short to ground on CAN_L side	CAN_H	Waveform with the minimum voltage at 0 V.
• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
CAN_L	Voltage is 0 V.
• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
Short between circuits	CAN_H	CAN_H side, CAN_L side: Approx. 2.5 V constant voltage
CAN_L	• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - ) • CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
Open circuit on CAN_H side (Open circuit between PCM and instrument cluster)	CAN_H	• As indicated by a, a waveform which is the same as the signal waveform on the CAN_L side may display. • The maximum voltage is higher than normal.
• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
CAN_L	The minimum voltage is lower than normal.
• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
Open circuit on CAN_L side (Open circuit between PCM and instrument cluster)	CAN_H	Maximum voltage is higher than normal.
• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
CAN_L	As indicated by b, a waveform which is the same as the signal waveform on the CAN_H side may display.
• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
Open circuit on CAN_H side (Open circuit other than between PCM and instrument cluster)	CAN_H	• Minimum voltage is the same as the minimum voltage on the CAN_L side. • It shows a waveform with a constant voltage range and cycle as indicated by c.
• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
CAN_L	• Minimum voltage is lower than normal. • It shows a waveform with a constant voltage range and cycle as indicated by c.
• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
Open circuit on CAN_L side (Open circuit other than between PCM and instrument cluster)	CAN_H	• Maximum voltage is higher than normal. • It shows a waveform with a constant voltage range and cycle as indicated by c.
• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 200 µs/DIV (X), DC range
CAN_L	• The maximum voltage is the same as the maximum voltage on the CAN_H side. • It shows a waveform with a constant voltage range and cycle as indicated by c.
• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

CAN circuit condition

CAN communication specification

Special Features

Signal waveform (reference)

Normal

CAN_H

• Connection terminal: DLC-2: terminal F (+) ↔ body ground ( -)

• Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

CAN_L

• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

Short to power supply on CAN_H side

CAN_H

• B+ constant voltage.

Note

• If a short to power supply other than B+ power supply occurs, it shows the voltage of the shorted power supply.

• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - )

• Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range

CAN_L

• Waveform with maximum voltage at B+.

Note

• If a short to ground other than the B+ power supply occurs, it shows a waveform with the maximum voltage of the shorted power supply voltage.

• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - )

• Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range

Short to power supply on CAN_L side

CAN_H

• B+ constant voltage.

Note

• If a short to power supply other than B+ power supply occurs, it shows the voltage of the shorted power supply.

CAN_L

• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - )

• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - )

• 2 V/DIV (Y), 5 ms/DIV (X), DC range

Short to ground on CAN_H side

CAN_H

CAN_H side, CAN_L side: 0 V constant voltage.

CAN_L

• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - )

• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 5 ms/DIV (X), DC range

Short to ground on CAN_L side

CAN_H

Waveform with the minimum voltage at 0 V.

• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 5 ms/DIV (X), DC range

CAN_L

Voltage is 0 V.

• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 5 ms/DIV (X), DC range

Short between circuits

CAN_H

CAN_H side, CAN_L side: Approx. 2.5 V constant voltage

CAN_L

• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - )

• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 5 ms/DIV (X), DC range

Open circuit on CAN_H side

(Open circuit between PCM and instrument cluster)

CAN_H

• As indicated by a, a waveform which is the same as the signal waveform on the CAN_L side may display.

• The maximum voltage is higher than normal.

• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

CAN_L

The minimum voltage is lower than normal.

• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

Open circuit on CAN_L side

(Open circuit between PCM and instrument cluster)

CAN_H

Maximum voltage is higher than normal.

• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

CAN_L

As indicated by b, a waveform which is the same as the signal waveform on the CAN_H side may display.

• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

Open circuit on CAN_H side

(Open circuit other than between PCM and instrument cluster)

CAN_H

• Minimum voltage is the same as the minimum voltage on the CAN_L side.

• It shows a waveform with a constant voltage range and cycle as indicated by c.

• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

CAN_L

• Minimum voltage is lower than normal.

• It shows a waveform with a constant voltage range and cycle as indicated by c.

• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

Open circuit on CAN_L side

(Open circuit other than between PCM and instrument cluster)

CAN_H

• Maximum voltage is higher than normal.

• It shows a waveform with a constant voltage range and cycle as indicated by c.

• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

CAN_L

• The maximum voltage is the same as the maximum voltage on the CAN_H side.

• It shows a waveform with a constant voltage range and cycle as indicated by c.

• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 200 µs/DIV (X), DC range

CAN circuit condition	CAN communication specification	Special Features
Normal	CAN_H	-
• Connection terminal: DLC-2: terminal L (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
CAN_L	-
• Connection terminal: DLC-2: terminal K (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
Short to power supply on CAN_H side	CAN_H	• B+ constant voltage. Note • If a short to power supply other than B+ power supply occurs, it shows the voltage of the shorted power supply.
• Connection terminal: DLC-2: terminal L (+) ↔ Body ground ( - ) • Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range
CAN_L	• Waveform with maximum voltage at B+. Note • If a short to ground other than the B+ power supply occurs, it shows a waveform with the maximum voltage of the shorted power supply voltage.
• Connection terminal: DLC-2: terminal K (+) ↔ Body ground ( - ) • Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range
Short to power supply on CAN_L side	CAN_H	• B+ constant voltage. Note • If a short to power supply other than B+ power supply occurs, it shows the voltage of the shorted power supply.
CAN_L	• CAN_H side: DLC-2: terminal L (+) ↔ Body ground ( - ) • CAN_L side: DLC-2: terminal K (+) ↔ Body ground ( - ) • 2 V/DIV (Y), 5 ms/DIV (X), DC range
Short to ground on CAN_H side	CAN_H	CAN_H side, CAN_L side: 0 V constant voltage.
CAN_L	• CAN_H side: DLC-2: terminal L (+) ↔ Body ground ( - ) • CAN_L side: DLC-2: terminal K (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
Short to ground on CAN_L side	CAN_H	Waveform with the minimum voltage at 0 V.
• CAN_H side: DLC-2: terminal L (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
CAN_L	Voltage is 0 V.
• CAN_L side: DLC-2: terminal K (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
Short between circuits	CAN_H	CAN_H side, CAN_L side: Approx. 2.5 V constant voltage.
CAN_L	• CAN_H side: DLC-2: terminal L (+) ↔ Body ground ( - ) • CAN_L side: DLC-2: terminal K (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
Open circuit on CAN_H side (Open circuit between multi information display/information display and instrument cluster)	CAN_H	• As indicated by d, a waveform which is the same as the signal waveform on the CAN_L side may display. • Maximum voltage is higher than normal.
• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
CAN_L	Minimum voltage is lower than normal.
• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
Open circuit on CAN_L side (Open circuit between multi information display/information display and instrument cluster)	CAN_H	Maximum voltage is higher than normal.
• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
CAN_L	• Minimum voltage is lower than normal. • As indicated by e, a waveform which is the same as the signal waveform on the CAN_H side may display.
• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 2 ms/DIV (X), DC range
Open circuit on CAN_H side (Open circuit other than between multi information display/information display and instrument cluster)	CAN_H	• Minimum voltage is the same as the minimum voltage on the CAN_L side. • It shows a waveform with a constant voltage range and cycle as indicated by f.
• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
CAN_L	• Minimum voltage is lower than normal. • It shows a waveform with a constant voltage range and cycle as indicated by f.
• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - ) • Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
Open circuit on CAN_L side (Open circuit other than between multi information display/information display and instrument cluster)	CAN_H	• Maximum voltage is higher than normal. • It shows a waveform with a constant voltage range and cycle as indicated by f.
• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
CAN_L	• Maximum voltage is the same as the maximum voltage on the CAN_H side. • It shows a waveform with a constant voltage range and cycle as indicated by f.
• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - ) • 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

CAN circuit condition

CAN communication specification

Special Features

Signal waveform (reference)

Normal

CAN_H

• Connection terminal: DLC-2: terminal L (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

CAN_L

• Connection terminal: DLC-2: terminal K (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Short to power supply on CAN_H side

CAN_H

• B+ constant voltage.

Note

• If a short to power supply other than B+ power supply occurs, it shows the voltage of the shorted power supply.

• Connection terminal: DLC-2: terminal L (+) ↔ Body ground ( - )

• Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range

CAN_L

• Waveform with maximum voltage at B+.

Note

• If a short to ground other than the B+ power supply occurs, it shows a waveform with the maximum voltage of the shorted power supply voltage.

• Connection terminal: DLC-2: terminal K (+) ↔ Body ground ( - )

• Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range

Short to power supply on CAN_L side

CAN_H

• B+ constant voltage.

Note

• If a short to power supply other than B+ power supply occurs, it shows the voltage of the shorted power supply.

CAN_L

• CAN_H side: DLC-2: terminal L (+) ↔ Body ground ( - )

• CAN_L side: DLC-2: terminal K (+) ↔ Body ground ( - )

• 2 V/DIV (Y), 5 ms/DIV (X), DC range

Short to ground on CAN_H side

CAN_H

CAN_H side, CAN_L side: 0 V constant voltage.

CAN_L

• CAN_H side: DLC-2: terminal L (+) ↔ Body ground ( - )

• CAN_L side: DLC-2: terminal K (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 5 ms/DIV (X), DC range

Short to ground on CAN_L side

CAN_H

Waveform with the minimum voltage at 0 V.

• CAN_H side: DLC-2: terminal L (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 5 ms/DIV (X), DC range

CAN_L

Voltage is 0 V.

• CAN_L side: DLC-2: terminal K (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 5 ms/DIV (X), DC range

Short between circuits

CAN_H

CAN_H side, CAN_L side: Approx. 2.5 V constant voltage.

CAN_L

• CAN_H side: DLC-2: terminal L (+) ↔ Body ground ( - )

• CAN_L side: DLC-2: terminal K (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 5 ms/DIV (X), DC range

Open circuit on CAN_H side

(Open circuit between multi information display/information display and instrument cluster)

CAN_H

• As indicated by d, a waveform which is the same as the signal waveform on the CAN_L side may display.

• Maximum voltage is higher than normal.

• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

CAN_L

Minimum voltage is lower than normal.

• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Open circuit on CAN_L side

(Open circuit between multi information display/information display and instrument cluster)

CAN_H

Maximum voltage is higher than normal.

• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

CAN_L

• Minimum voltage is lower than normal.

• As indicated by e, a waveform which is the same as the signal waveform on the CAN_H side may display.

• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 2 ms/DIV (X), DC range

Open circuit on CAN_H side

(Open circuit other than between multi information display/information display and instrument cluster)

CAN_H

• Minimum voltage is the same as the minimum voltage on the CAN_L side.

• It shows a waveform with a constant voltage range and cycle as indicated by f.

• Connection terminal: DLC-2: terminal F (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

CAN_L

• Minimum voltage is lower than normal.

• It shows a waveform with a constant voltage range and cycle as indicated by f.

• Connection terminal: DLC-2: terminal E (+) ↔ Body ground ( - )

• Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Open circuit on CAN_L side

(Open circuit other than between multi information display/information display and instrument cluster)

CAN_H

• Maximum voltage is higher than normal.

• It shows a waveform with a constant voltage range and cycle as indicated by f.

• CAN_H side: DLC-2: terminal F (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

CAN_L

• Maximum voltage is the same as the maximum voltage on the CAN_H side.

• It shows a waveform with a constant voltage range and cycle as indicated by f.

• CAN_L side: DLC-2: terminal E (+) ↔ Body ground ( - )

• 0.5 V/DIV (Y), 1 ms/DIV (X), DC range