CHECK WIRING HARNESS.

1) Disconnect the ECM connector (B135 or 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 — (B135) No. 21:

Diesel engine model

(B420) No. 39 — (B134) No. 27:

QUESTION

Is there continuity?

Yes No

Repair or replace the open circuit of harness.