Diagnosis Procedure

1.CHECK NETWORK-DTC

Check the CAN diagnosis results from M.U.T.-III SE to see that the chassis CAN communication 3 circuit have no malfunction.

Are the chassis CAN communication 3 circuit normal?

Check and repair chassis CAN communication 3 circuit.

2.CONNECTOR INSPECTION

Turn the ignition switch OFF.
Disconnect the battery cable from the negative terminal.
Disconnect all the control unit connectors on chassis CAN communication 2 circuit.
Check the terminals and connectors for damage, bend and loose connection.

Is the inspection result normal?

Repair the terminal and connector.

3.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Check the continuity between the chassis control module harness connector and ABS actuator and electric unit (control unit) harness connector.

Chassis control module harness connector		ABS actuator and electric unit (control unit) harness connector		Continuity
Connector No.	Terminal No.	Connector No.	Terminal No.
B36	7	E125	19	Existed
	19		5	Existed

Is the inspection result normal?

Check the harness and repair or replace the root cause.

4.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

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

Chassis control module harness connector			Continuity
Connector No.	Terminal No.
B36	7	19	Not existed

Is the inspection result normal?

Check the harness and repair or replace the root cause.

5.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

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

Chassis control module harness connector		Ground	Continuity
Connector No.	Terminal No.
B36	7		Not existed
	19		Not existed

Is the inspection result normal?

Check the harness and repair or replace (if shield line is short) the root cause.

6.CHECK CHASSIS CONTROL MODULE AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) TERMINATION CIRCUIT

Remove the chassis control module and the ABS actuator and electric unit (control unit).
Check the resistance between the chassis control module terminals.
Chassis control module Resistance (Ω)
Terminal No.
7 19 Approx. 108 – 132
Check the resistance between the ABS actuator and electric unit (control unit) terminals.
ABS actuator and electric unit (control unit) Resistance (Ω)
Terminal No.
19 5 Approx. 108 – 132

Is the measurement value within the specification?

Replace the chassis control module and/or the ABS actuator and electric unit (control unit).

7.CHECK SYMPTOM

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

Inspection result

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

8.CHECK UNIT REPRODUCTION

Perform the reproduction test as per the following procedure for each unit.

Turn the ignition switch OFF.
Disconnect the battery cable from the negative terminal.
Disconnect one of the unit connectors of chassis CAN communication 2 circuit.
note Chassis control module and ABS actuator and electric unit (control unit) have a termination circuits. Check other units first.
Connect the 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

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

: Replace the unit whose connector was disconnected.