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Home >> GMC >> 1996 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Engine Controls - Basic Testing - 2.5L) >> Fuel System >> Auto Shutdown (ASD) Relay

Auto Shutdown (ASD) Relay

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, 1995 Dodge Dakota, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If ASD relay is suspected of causing a fuel or ignition system malfunction, use Diagnostic Readout Box (DRB) to diagnose ASD relay. See appropriate TESTS W/CODES article below.

ASD relay provides battery voltage to alternator field winding, electric fuel pump, fuel injectors, ignition coil and oxygen sensor heating element. PCM controls ASD relay by switching ASD relay ground circuit on and off. ASD relay is located inside Power Distribution Center (PDC), which is located in engine compartment. See label on PDC cover for relay and fuse identification.

PCM determines engine speed and synchronizes injectors from distributor pick-up signal. If Crankshaft Position (CKP) signal is not received when ignition switch is in RUN or START position, PCM opens ASD relay ground circuit. ASD relay turns off battery voltage to alternator field winding, electric fuel pump, fuel injectors, ignition coil and O2S heating element.

If ASD relay has a suspected malfunction, replace with a known-good part and retest. If malfunction is still present, see appropriate TESTS W/CODES article below.

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