CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM and engine coolant temperature sensor.

3) Measure the resistance between ECM and chassis ground.

Connector & terminal

(B137) No. 11 — Chassis ground:

QUESTION

Is the resistance 1 MΩ or more?

Yes No

Replace the engine coolant temperature sensor.

Repair short circuit in harness to ground between ECM and engine coolant temperature sensor connector.