DTC B1142:14 [TELEMATICS COMMUNICATION UNIT (TYPE-B)]

id1602a7015700

Outline

System malfunction location

Telematics communication unit power supply circuit (IG1) malfunction

Detection condition

•  The telematics communication unit detects an open circuit or a short to ground in the power supply circuit (IG1) for 10 s or more.

Fail-safe

Not applicable

Possible cause

•  IG1 relay malfunction

•  DTCs are stored in the start stop unit.

•  DTCs are stored in the PCM.

•  Battery malfunction

•  Generator malfunction

•  Telematics communication unit connector or terminal malfunction

•  Short to ground or open circuit in telematics communication unit IG1 relay circuit

•  Telematics communication unit malfunction

System malfunction location	Telematics communication unit power supply circuit (IG1) malfunction
Detection condition	• The telematics communication unit detects an open circuit or a short to ground in the power supply circuit (IG1) for 10 s or more.
Fail-safe	Not applicable
Possible cause	• IG1 relay malfunction • DTCs are stored in the start stop unit. • DTCs are stored in the PCM. • Battery malfunction • Generator malfunction • Telematics communication unit connector or terminal malfunction • Short to ground or open circuit in telematics communication unit IG1 relay circuit • Telematics communication unit malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT IG1 RELAY FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [RELAY INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(Refer to the [RELAY LOCATION] in the workshop manual)

2

INSPECT START STOP UNIT FOR MALFUNCTION

•  Perform the DTC inspection for the start stop unit.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is a DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(Refer to the [DTC TABLE [START STOP UNIT]] in the workshop manual)

No

Go to the next step.

3

INSPECT PCM FOR MALFUNCTION

•  Perform the DTC inspection for the PCM.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is a DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(Refer to the [DTC TABLE [PCM (SKYACTIV-G)]] in the workshop manual)

(Refer to the [DTC TABLE [PCM (SKYACTIV-D)]] in the workshop manual)

No

Go to the next step.

4

INSPECT BATTERY FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [BATTERY INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(Refer to the [BATTERY RECHARGING] in the workshop manual)

(Refer to the [BATTERY REMOVAL/INSTALLATION] in the workshop manual)

5

INSPECT GENERATOR FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [GENERATOR INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(Refer to the [GENERATOR REMOVAL/INSTALLATION] in the workshop manual)

6

INSPECT TELEMATICS COMMUNICATION UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

7

INSPECT TELEMATICS COMMUNICATION UNIT IG1 RELAY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

•  Inspect the applicable circuit for a short to ground and open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Switch the ignition ON (engine off or on) and wait for 10 s or more.

•  Perform the DTC inspection for the telematics communication unit.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the telematics communication unit, then go to the next step.
(Refer to the [TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION] in the workshop manual)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

•  Perform the DTC inspection.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT IG1 RELAY FOR MALFUNCTION • Inspect the applicable part. (Refer to the [RELAY INSPECTION] in the workshop manual) • Is the part normal?	Yes	Go to the next step.
1		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [RELAY LOCATION] in the workshop manual)
2	INSPECT START STOP UNIT FOR MALFUNCTION • Perform the DTC inspection for the start stop unit. (Refer to the [DTC INSPECTION] in the workshop manual) • Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [START STOP UNIT]] in the workshop manual)
2		No	Go to the next step.
3	INSPECT PCM FOR MALFUNCTION • Perform the DTC inspection for the PCM. (Refer to the [DTC INSPECTION] in the workshop manual) • Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [PCM (SKYACTIV-G)]] in the workshop manual) (Refer to the [DTC TABLE [PCM (SKYACTIV-D)]] in the workshop manual)
3		No	Go to the next step.
4	INSPECT BATTERY FOR MALFUNCTION • Inspect the applicable part. (Refer to the [BATTERY INSPECTION] in the workshop manual) • Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [BATTERY RECHARGING] in the workshop manual) (Refer to the [BATTERY REMOVAL/INSTALLATION] in the workshop manual)
5	INSPECT GENERATOR FOR MALFUNCTION • Inspect the applicable part. (Refer to the [GENERATOR INSPECTION] in the workshop manual) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [GENERATOR REMOVAL/INSTALLATION] in the workshop manual)
6	INSPECT TELEMATICS COMMUNICATION UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) • Are the connector and terminal normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT TELEMATICS COMMUNICATION UNIT IG1 RELAY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the applicable circuit for a short to ground and open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Switch the ignition ON (engine off or on) and wait for 10 s or more. • Perform the DTC inspection for the telematics communication unit. (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the telematics communication unit, then go to the next step. (Refer to the [TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION] in the workshop manual)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (Refer to the [DTC INSPECTION] in the workshop manual) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.