CAN COMMUNICATION CIRCUIT

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

YES>>GO TO 2.

NO>>Repair the terminal and connector.

Check the continuity between the data link connector terminals.

Data link connector			Continuity
Connector No.	Terminal No.
M24	6	14	Not existed

YES>>GO TO 3.

NO>>Check the harness and repair the root cause.

Check the continuity between the data link connector and the ground.

Data link connector		Ground	Continuity
Connector No.	Terminal No.
M24	6		Not existed
	14		Not existed

YES>>GO TO 4.

NO>>Check the harness and repair the root cause.

1. Remove the ECM and the IPDM E/R.
2. Check the resistance between the ECM terminals.
   
   
   

   ECM		Resistance (Ω)
   Terminal No.
   101	97	Approx. 108 – 132

   
   
3. Check the resistance between the IPDM E/R terminals.
   

   IPDM E/R		Resistance (Ω)
   Terminal No.
   40	39	Approx. 108 – 132

   
   

YES>>GO TO 5.

NO>>Replace the ECM and/or the IPDM E/R.

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

Reproduced>>GO TO 6.

Non‐reproduced>>Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.

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

1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect one of the unit connectors of CAN communication system.
   NOTE：
   ECM and IPDM E/R have a termination circuit. Check other units first.
   
4. 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.
   

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

Non‐reproduced>>Replace the unit whose connector was disconnected.