DTC U0001:88, U0073:00 [MULTIPLEX COMMUNICATION SYSTEM]

id0902e6395400

Caution

• Perform the following malfunction diagnosis according to the determination using the flowchart. (See DETERMINATION USING FLOWCHART [MULTIPLEX COMMUNICATION SYSTEM].)

Detection Condition

Caution

• If an open circuit is detected, push the connector in the connection direction to verify that there is no looseness or disconnection before disconnecting the related connector for inspection.

• When disconnecting the connector, verify that there is no damage, deformation, or corrosion of the connector terminals.

• When inspecting the DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.

• CAN system related wiring harness has a malfunction

• CAN system-related module has a malfunction

Possible Causes

• Open or short circuit in wiring harness

• Connector malfunction

• PCM malfunction

• ABS HU/CM malfunction (with ABS)

• DSC HU/CM malfunction (with DSC)

• BCM malfunction

• Keyless control module malfunction (with advanced keyless and start system)

• SAS control module malfunction

• EPS control module malfunction

• Theft-deterrent control module (with theft-deterrent system)

• Instrument cluster malfunction

Step

Inspection

Action

1

VERIFICATION BEFORE SERVICING

•  Are any DTCs, except the following, displayed?

―  U0001:88

―  U0073:00

Yes

Determine the malfunctioning part.

(See PROCEDURES FOR DETERMINING LOCATION OF MALFUNCTION (L.H.D) [MULTIPLEX COMMUNICATION SYSTEM].)

(See PROCEDURES FOR DETERMINING LOCATION OF MALFUNCTION (R.H.D) [MULTIPLEX COMMUNICATION SYSTEM].)

No

Go to the next step.

2

INSPECT DTCs OUTPUT FROM CONNECTOR

•  Inspect the terminal condition of the control module connector which output DTCs and the mid-connector.

•  Are the connector terminals normal without damage, deformation, corrosion, or disconnection?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

3

INSPECT POWER SUPPLY OF CONTROL MODULE OUTPUTTING DTCs

•  Refer to the terminal voltage table of the control module outputting DTCs and inspect the terminal voltage and fuse condition.

•  Is the power supply normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

4

INSPECT BODY GROUND CONDITION OF CONTROL MODULE OUTPUTTING DTCs

•  Inspect the body ground wires and ground point of the control module outputting DTCs.

•  Are the ground and ground point normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

5

INSPECT CAN SYSTEM RELATED WIRING HARNESS

•  Inspect the CAN system related wiring harness.

―  Short to ground

―  Short to power supply

―  Short circuit between twisted pair wiring harnesses

―  Open circuit

•  Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness, then go to the next step.

6

INSPECT CAN-RELATED MODULES OTHER THAN BCM

•  Remove only one of the CAN-related modules other than those related to the BCM.

•  Clear DTCs using the M-MDS.

•  Verify DTCs using the M-MDS.

•  Is DTCs displayed?

―  U0001:88

―  U0073:00

Yes

Install the removed, remove one of the other modules, then inspect all of the CAN-related modules using the same procedure.

After inspecting all of the modules, go to the next step.

No

Replace the removed module.

7

INSPECT DTCs

•  Remove the BCM, then connect all of the modules.

•  Clear DTCs using the M-MDS.

•  Verify DTCs using the M-MDS.

•  Is DTCs displayed?

―  U0001:88

―  U0073:00

Yes

Return to Step 2.

No

Replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

Step	Inspection		Action
1	VERIFICATION BEFORE SERVICING • Are any DTCs, except the following, displayed? ― U0001:88 ― U0073:00	Yes	Determine the malfunctioning part. (See PROCEDURES FOR DETERMINING LOCATION OF MALFUNCTION (L.H.D) [MULTIPLEX COMMUNICATION SYSTEM].) (See PROCEDURES FOR DETERMINING LOCATION OF MALFUNCTION (R.H.D) [MULTIPLEX COMMUNICATION SYSTEM].)
1		No	Go to the next step.
2	INSPECT DTCs OUTPUT FROM CONNECTOR • Inspect the terminal condition of the control module connector which output DTCs and the mid-connector. • Are the connector terminals normal without damage, deformation, corrosion, or disconnection?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 6.
3	INSPECT POWER SUPPLY OF CONTROL MODULE OUTPUTTING DTCs • Refer to the terminal voltage table of the control module outputting DTCs and inspect the terminal voltage and fuse condition. • Is the power supply normal?	Yes	Go to the next step.
3		No	Repair or replace the connector, then go to Step 6.
4	INSPECT BODY GROUND CONDITION OF CONTROL MODULE OUTPUTTING DTCs • Inspect the body ground wires and ground point of the control module outputting DTCs. • Are the ground and ground point normal?	Yes	Go to the next step.
4		No	Repair or replace the connector, then go to Step 6.
5	INSPECT CAN SYSTEM RELATED WIRING HARNESS • Inspect the CAN system related wiring harness. ― Short to ground ― Short to power supply ― Short circuit between twisted pair wiring harnesses ― Open circuit • Is the wiring harness normal?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness, then go to the next step.
6	INSPECT CAN-RELATED MODULES OTHER THAN BCM • Remove only one of the CAN-related modules other than those related to the BCM. • Clear DTCs using the M-MDS. • Verify DTCs using the M-MDS. • Is DTCs displayed? ― U0001:88 ― U0073:00	Yes	Install the removed, remove one of the other modules, then inspect all of the CAN-related modules using the same procedure. After inspecting all of the modules, go to the next step.
6		No	Replace the removed module.
7	INSPECT DTCs • Remove the BCM, then connect all of the modules. • Clear DTCs using the M-MDS. • Verify DTCs using the M-MDS. • Is DTCs displayed? ― U0001:88 ― U0073:00	Yes	Return to Step 2.
7		No	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)