CHECK POWER SUPPLY CM.

1) Disconnect the connector from ECM.

2) Depress the brake pedal (AT model) or clutch pedal (MT model), and push the push button ignition switch.

3) Using a tester, measure the voltage between the power supply CM and chassis ground.

Connector & terminal

(B420) No. 39 (+) — Chassis ground (−):

QUESTION

Does the voltage change from less than 1 V → +B-2 V or more?

Yes No

Perform fault diagnosis for the engine system.

Replace the power supply CM.