Computer Controlled Shutdown

The PCM energizes the PCM power relay, by grounding the PCMRC circuit. After the ignition is in the OFF, ACC or LOCK position, the PCM stays powered up until the engine shutdown occurs and other conditions have been met.

The PCM initiates logic which will lead to powering down the PCM power relay. After this logic is initiated, the following conditions must be met for the PCM power relay to be depowered:

• The ignition is OFF.
• The gear selector position is in PARK.
• The EVAP leak check monitor is complete.
• The vehicle speed is below a calibrated threshold.
• The PCM power relay diagnostic is complete.
• The electric water pump is OFF.