| CHECK POWER SUPPLY CM. |
|
1) Disconnect the connector from ECM. 2) Depress the brake pedal, and press 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 → 2 V or more? | |
| Yes | No |
|
Perform fault diagnosis for the engine system. |
Replace the power supply CM. |
