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Home >> Jeep >> 1994 >> Grand Cherokee Laredo, 4.0 S, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Basic Testing - 5.2L) >> Fuel System >> Fuel Pump Relay

Fuel Pump Relay

WARNING: This page is about a different variant/trim than selected.
NOTE: If fuel pump relay is suspected of causing a fuel or ignition system malfunction, use Diagnostic Readout Box (DRB) to diagnose pump relay. See TESTS W/CODES - 5.2L article in this section.

Fuel pump relay is controlled by PCM through the same ground circuit as ASD relay or through ASD relay. When PCM turns ASD relay ground circuit off, fuel pump relay ground circuit is also turned off. See AUTO SHUTDOWN (ASD) RELAY  .

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