Read here about ASD relay. What is it, how to diagnose and how to fix it to make the engine work again. Not only for Jeep owners.. The ASD relay is VERY important to the Jeep. When it powers up, it supplies power to the fuel pump and the ignition system (coil) The PCM grounds one of the 4 wires when it sees a RPM signal from the Crank sensor. Quick test: Swap relay with similar one, see if problem is fixed. Another test: Key on, ASD relay removed.
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APPLIES TO: This Auto Shut Down (ASD) relay circuit wiring diagram applies to the following vehicles: 1993, 1994, 1995 4.0L Jeep Grand Cherokee. ASD relay troubleshooting notes: The auto shut down (ASD) relay gets power from fuse #6 (15 Amp) and fuse #2 (20 Amp) of the Power Distribution Center (PDC). The PCM activates the ASD relay and the fuel pump relay at the exact same time and thru' the.. When it started cutting out more frequently, I wired in a switch to energize the ASD relay manually and it worked fine for a few months. After that, I noticed the fuel pump relay clicking the same as the ASD and then a followed by the A/C clutch relay a couple weeks later.
![[DIAGRAM] 2001 Jeep Grand Cherokee Asd Relay Wiring Diagram MYDIAGRAM](https://www.2carpros.com/images/question_images/14997/original.gif "[DIAGRAM] 2001 Jeep Grand Cherokee Asd Relay Wiring Diagram MYDIAGRAM")
