CHECK WIRING HARNESS.

1) Disconnect connector (B135) from the ECM.

2) Using a tester, check continuity between the power supply CM and ECM.

Connector & terminal

Turbo model

(B420) No. 31 — (B135) No. 3:

Non-turbo model

(B420) No. 31 — (B135) No. 34:

Diesel engine model

(B420) No. 31 — (B134) No. 35:

QUESTION

Is there continuity?

Yes No

Repair the open circuit in the harness.