SRT-4 L4-2.4L Turbo VIN S (2004)
Main Relay (Computer/Fuel System): Description and Operation
The ASD relay is located in the PDC. The inside top of the PDC cover has label showing relay and fuse identification.
The Automatic Shutdown (ASD) relay supplies battery voltage to the fuel injectors, electronic ignition coil and the heating elements in the oxygen
sensors.
A buss bar in the Power Distribution Center (PDC) supplies voltage to the solenoid side and contact side of the relay. The fuse also protects the power
circuit for the fuel pump relay and pump. The fuse is located in the PDC. Refer to the Wiring Diagrams for circuit information.
The PCM controls the ASD relay by switching the ground path for the solenoid side of the relay on and off. The PCM turns the ground path off when the
ignition switch is in the Off position. When the ignition switch is in On or Start, the PCM monitors the crankshaft and camshaft position sensor signals to
determine engine speed and ignition timing (coil dwell). If the PCM does not receive crankshaft and camshaft position sensor signals when the ignition
switch is in the Run position, it will de-energize the ASD relay.
