CHECK SHORT CIRCUIT IN RADIATOR FAN RELAY CONTROL CIRCUIT.

1) Turn the ignition switch to OFF.

2) Remove the main fan relay and sub fan relay. (Model with A/C)

3) Disconnect the test mode connector.

4) Turn the ignition switch to ON.

5) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B136) No. 18 (+) — Chassis ground (−):

(B136) No. 29 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Repair the battery short circuit in radiator fan relay control circuit. After repair, replace the ECM.