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Home >> Dodge and Ram >> 1995 >> Caravan Base, 2.5 K >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 2.5L >> Fuel System >> Auto Shutdown (ASD) Relay
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Auto Shutdown (ASD) Relay

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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