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 and CAN communication circuit 2 have no malfunction.

Are the CAN communication 1 and CAN communication 2 circuits normal?

YES

GO TO STEP 2 .

NO

Check and repair CAN communication circuit 1 and/or CAN communication circuit 2.

CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the 12V battery cable from the negative terminal.
3. Check the terminals and connectors of the chassis control module for damage, bend and loose connection (unit side and connector side).
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 chassis control module.

Check the continuity between the chassis control module harness connector terminals.

Chassis control module harness connector			Continuity
Connector No.	Terminal No.
E22	11	19	Existed
	8	7	Existed

Is the inspection result normal?

YES

GO TO STEP 4 .

Check the harness and repair or replace the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Disconnect all the unit connectors on chassis communication circuit.

Check the continuity between the chassis control module harness connector terminals.

Chassis control module harness connector			Continuity
Connector No.	Terminal No.
E22	11	8	Not existed

Is the inspection result normal?

YES

GO TO STEP 5 .

Check the harness and repair or replace the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the chassis control module harness connector and the ground.

Chassis control module harness connector		Ground	Continuity
Connector No.	Terminal No.
E22	11		Not existed
	8		Not existed

Is the inspection result normal?

YES

GO TO STEP 6 .

Check the harness and repair or replace the root cause.

CHECK CHASSIS CONTROL MODULE TERMINATION CIRCUIT

Remove the chassis control module.

Check the resistance between the chassis control module terminals.

Chassis control module		Resistance (Ω)
Terminal No.
11	8	Approx. 108 - 132
19	7	Approx. 108 - 132

Is the measurement value within the specification?

YES

GO TO STEP 7 .

Replace the chassis control module.

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 8 .

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 chassis communication circuit.
  NOTE:
  Chassis control module 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.