Auto Shutdown Relay

Auto Shutdown (ASD) relay is located in Power Distribution Center (PDC). PDC is located on right side of engine compartment, next to battery. For ASD relay location within PDC, refer to PDC cover label.

ASD relay supplies battery voltage to fuel pump, fuel injectors, generator field winding, HO2S heater element and ignition coil(s). Relay contacts are normally open.

Power is supplied to relay coil when ignition is turned on. PCM controls ground circuit, which energizes relay coil and closes relay contacts.

PCM will only ground relay when ignition switch is in RUN or START positions, and activity is sensed through CMP sensor and CKP sensor. If PCM senses RPM signal has stopped, it will remove ground from relay coil, which will cause contacts to open and remove power from circuit.