Auto Shut Down (ASD) Relay Wiring Diagram (1993-1995 4.0L Jeep Grand Cherokee).Key On Engine Running (but no vacuum applied to fuel pressure regulator): 39-41 PSI (2.7-2.9kg/cm²).Key On Engine Running: 31 PSI (2.2kg/cm²).The factory fuel pump specifications are:.If either sensor indicates no engine RPMs, the PCM will not activate the fuel pump relay past the 1-3 seconds initial run time.
As you're cranking the engine to get it started, the PCM maintains the fuel pump relay activated only if it receives a crankshaft and camshaft position sensor signal (that shows the engine cranking or running).The PCM activates the fuel pump relay for 1 to 3 seconds when the ignition switch is turned to the RUN position but the engine is not cranked or started.The PCM activates the fuel pump relay and the auto shut down (ASD) relay at the exact same time and thru' the same circuit (PNK wire).The fuel pump relay gets power from fuse #6 (15 Amp) of the Power Distribution Center (PDC).APPLIES TO: This fuel pump relay circuit wiring diagram applies to the following vehicles:
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