CHECK INPUT VOLTAGE OF ECM.

1) Turn the ignition switch to OFF.

2) Connect the connector to starter relay.

3) Disconnect the connectors from the ECM.

4) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B136) No. 32 (+) — Chassis ground (−):

(B136) No. 20 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Replace the ECM.

Repair the open or ground short circuit of harness between ECM and starter relay.