CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from the ECM.

3) Turn the ignition switch to ON.

4) Measure the voltage between electronic throttle control relay connector and chassis ground.

Connector & terminal

(B309) No. 3 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Repair the power supply short circuit of harness between ECM and electronic throttle control relay.