VPWR3 Check Power to PCM Relay
- Key OFF.
- Remove the PCM (ENGINE CONT.) relay.
- Key ON.
- Measure the voltage between the PWR wires at the PCM relay and ground.
- Are the voltages greater than 10 volts?
YES -- GO to VPWR4. VPWR4 Check Ground at PCM Relay
NO -- CHECK the 25A ENGINE CONT. fuse.
If OK, SERVICE the PWR wire(s) in question.