CHECK HARNESS BETWEEN ECM AND POWER SUPPLY CM CONNECTOR.

1) Turn the ignition to OFF.

2) Disconnect the connectors from ECM and power supply CM.

3) Measure the resistance of harness between ECM and power supply CM.

Connector & terminal

Euro 4 model

(B135) No. 21 — (B420) No. 39:

Euro 5 model

(B136) No. 34 — (B420) No. 39:

QUESTION

Is the resistance less than 1 Ω?

Yes No

Repair the open circuit of harness between ECM and power supply CM connector.