Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN DIAGNOSIS

Check the CAN diagnosis results from CONSULT to see that the CAN communication circuit 1 has no malfunction.

Is the CAN communication circuit 1 normal?

YES

GO TO STEP 2 .

NO

Check and repair CAN communication circuit 1.

CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the 12V battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
  - CAN gateway
  - Harness connector B39 and fuse block (J/B) side connector
Is the inspection result normal?

YES

GO TO STEP 3 .

NO

Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the connector of CAN gateway.

Check the continuity between the CAN gateway harness connector terminals.

CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M24	4	6	Existed
	10	12	Existed

Is the inspection result normal?

YES

GO TO STEP 5 .

GO TO STEP 4 .

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Disconnect the fuse block (J/B) harness connector M133.

Check the continuity between the CAN gateway harness connector and the fuse block (J/B) harness connector.

CAN gateway harness connector		Fuse block (J/B) harness connector		Continuity
Connector No.	Terminal No.	Connector No.	Terminal No.	Continuity
M24	4	M133	13C	Existed
M24	10	M133	2C	Existed

Is the inspection result normal?

YES

Replace the fuse block (J/B).

Repair the harness between the CAN gateway harness connector M24 and the fuse block (J/B) harness connector M133.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Disconnect all the unit connectors on CAN communication circuit 2.

Check the continuity between the CAN gateway harness connector terminals.

CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M24	4	10	Not existed

Is the inspection result normal?

YES

GO TO STEP 6 .

Check the harness and repair or replace the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the CAN gateway harness connector and the ground.

CAN gateway harness connector		Ground	Continuity
Connector No.	Terminal No.
M24	4		Not existed
	10		Not existed

Is the inspection result normal?

YES

GO TO STEP 7 .

Check the harness and repair or replace the root cause.

CHECK CAN GATEWAY TERMINATION CIRCUIT

Remove the CAN gateway.

Check the resistance between the CAN gateway terminals.

CAN gateway		Resistance (Ω)
Terminal No.
4	10	Approx. 108 - 132
6	12	Approx. 108 - 132

Is the measurement value within the specification?

YES

GO TO STEP 8 .

Replace the CAN gateway.

CHECK SYMPTOM

Connect all the connectors. Check if the symptoms described in the "Symptom (Results from interview with customer) " are reproduced.

Inspection result

Reproduced

GO TO STEP 9 .

Non - reproduced

Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.

CHECK UNIT REPRODUCTION

Perform the reproduction test as per the following procedure for each unit.
1. Turn the ignition switch OFF.
2. Disconnect the 12V battery cable from the negative terminal.
3. Disconnect one of the unit connectors of CAN communication circuit 2.
  NOTE:
  CAN gateway has two termination circuits. Check other units first.
4. Connect the 12V battery cable to the negative terminal. Check if the symptoms described in the "Symptom (Results from interview with customer) " are reproduced.
  NOTE:
  Although unit-related error symptoms occur, do not confuse them with other symptoms.
Inspection result

Reproduced

Connect the connector. Check other units as per the above procedure.

Non - reproduced

Replace the unit whose connector was disconnected.