Cherokee 4WD L6-4.0L VIN S (1998)
Automatic Shut Down (ASD) Relay: Description and Operation
General Information
SYSTEM OPERATION
Automatic Shutdown (ASD) Relay
As one of its functions, the ASD relay will supply battery voltage to the ignition coil. The ground circuit for the ASD relay is controlled by the
Powertrain Control Module (PCM). The PCM regulates ASD relay operation by switching the ground circuit on-and-off.