Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
  - Data link connector
  - 3CH CAN gateway
Is the inspection result normal?

YES

GO TO 2.

NO

Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the connector of 3CH CAN gateway.

Check the continuity between the 3CH CAN gateway harness connector terminals.

3CH CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M6	3	11	Existed
	4	12	Existed

Is the inspection result normal?

YES

GO TO 3.

Check the harness and repair or replace the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the 3CH CAN gateway harness connector terminals.

3CH CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M6	3	4	Not existed

Is the inspection result normal?

YES

GO TO 4.

Check the harness and repair or replace the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the 3CH CAN gateway harness connector and the ground.

3CH CAN gateway harness connector		Ground	Continuity
Connector No.	Terminal No.
M6	3		Not existed
	4		Not existed

Is the inspection result normal?

YES

GO TO 5.

Check the harness and repair or replace the root cause.

CHECK 3CH CAN GATEWAY TERMINATION CIRCUIT

Remove the 3CH CAN gateway.

Check the resistance between the 3CH CAN gateway terminals.

3CH CAN gateway		Resistance (Ohm)
Terminal No.
3	4	Approx. 108 - 132
11	12	Approx. 108 - 132

Is the measurement value within the specification?

YES

Check CAN system type decision again.

YES

Error was detected in the diagnostic CAN communication circuit.

Replace the 3CH CAN gateway.