CHECK ECM SIGNAL.

1) Start the engine.

2) Measure the voltage between ECM connector and chassis ground.

Connector & terminal

Non-turbo model

(B135) No. 25 (+) — Chassis ground (−):

Turbo model

(B136) No. 22 (+) — Chassis ground (−):

QUESTION

Is the voltage 0 ←→ 14 V or more?

Yes No

Inspect the ECM.