CHECK WIRING HARNESS.

1) Disconnect the ECM connector (B136) and power supply CM connector.

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

Connector & terminal

Turbo model

(B420) No. 39 (+) — (B136) No. 32 (−):

Non-turbo model

(B420) No. 39 (+) — (B136) No. 34 (−):

Diesel engine model

(B420) No. 39 (+) — (B134) No. 27 (−):

QUESTION

Is there continuity?

Yes No

Repair or replace the open circuit of harness.