Jeep Repair Problems? Ask a Mechanic for Answers ASAP
I would rec to check for power at the ignition coil and injectors when cranking the engine over. The Auto Shut Down relay supplies power to the ignition coil and injectors. If there is no power, there will be no injector pulse and there will be no spark from th ignition coil. The asd relay could be bad. Or the computer may not be energizing the relay. IF that is the case, the inputs to the computer may be bad (possible bad cam or crankshaft position sensor)
AUTOMATIC SHUTDOWN (ASD) RELAY
As one of its functions, the Automatic Shutdown (ASD) relay will supply battery voltage to the ignition coil. The ground circuit for the ASD relay is controlled by the Powertrain Control Module (PCM) . The PCM regulates ASD relay operation by switching the ground circuit on-and-off.
where is this asd located and can you send a picture, also is there a cam sensor as well as a crank case position sensor, and i am assuming that the pcm is located on the fire wall on the passager side is this correct
That is correct!
Here is a picture of both the ecm and the asd relay.
ok i am satisfied with that,
where is the cam sensor?
Well, yes... if the cam sensor is bad the computer will not recognize the engine rpm and there for it will not activate the ASD relay.
Just be sure to test it before replacing it.
You can use a voltmeter or a lab scope.
If you use a voltmeter, you can only check the voltage coming out of this sensor with the engine off not with the engine running. THis is recuse the voltmeter is simply not fast enough to check the output of the sensor. But you could still check for power and ground going into the sensor with the key on with your voltmeter.
Did you have any further questions?