Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic detects an inoperative relay. The ignition relay, or main relay, is controlled by the powertrain control module (PCM). The PCM provides a ground for the relays coil anytime the ignition switch is ON. The MAIN relay supplies ignition positive voltage to many engine control systems and components. The following components receive power from the relay:
- The ignition coils
- The heated oxygen sensors (HO2S)
- The evaporative emission (EVAP) control system solenoids
- The camshaft and crankshaft position sensors
- The PCM