Hi all,
Would be ever grateful for any help concerning a "slightly out of my leage problem" I'm having with my 96 4.0 AW4 XJ. Search gave me a few threads with similar issues but all of them ended before a solution was presented.
As far as I can tell I have no PCM activity whatsoever. No gauges or dash warning lights with ignition on, no OBD connectivity with scan tool or key trick, no 5 volt reference at sensors no sound of fuel pump priming and needless to say engine won't run.
What I do have is cranking all day long, volts to cigar lighter, interior and exterior lights, stereo and so on.
So far I've tried disconnecting the CPS (still no priming or gauges), checked all fuses and relays (you guessed it, all's fine and dandy) and reset the PCM (no dice).
Never fiddles with the PCM/ECU before so would love opinions on the next logical step.
1. The no gauges, dash warning lights and dead OBD excludes the ASD circuit as the culprit right?
2. Pinout readings of the PCM (if I can find a chart) would be the next step right? The logic would be to find out if the problem is before, in or after the PCM.
I figure there must be a 12V in, a few 5V outs and a number of ground?
3. Basically at this point I'm thinking the problem could be a broken wire somewhere, a faulty sensor, ignition switch or the PCM itself. Am I missing something crucial?
Any help hugely appreciated!
Would be ever grateful for any help concerning a "slightly out of my leage problem" I'm having with my 96 4.0 AW4 XJ. Search gave me a few threads with similar issues but all of them ended before a solution was presented.
As far as I can tell I have no PCM activity whatsoever. No gauges or dash warning lights with ignition on, no OBD connectivity with scan tool or key trick, no 5 volt reference at sensors no sound of fuel pump priming and needless to say engine won't run.
What I do have is cranking all day long, volts to cigar lighter, interior and exterior lights, stereo and so on.
So far I've tried disconnecting the CPS (still no priming or gauges), checked all fuses and relays (you guessed it, all's fine and dandy) and reset the PCM (no dice).
Never fiddles with the PCM/ECU before so would love opinions on the next logical step.
1. The no gauges, dash warning lights and dead OBD excludes the ASD circuit as the culprit right?
2. Pinout readings of the PCM (if I can find a chart) would be the next step right? The logic would be to find out if the problem is before, in or after the PCM.
I figure there must be a 12V in, a few 5V outs and a number of ground?
3. Basically at this point I'm thinking the problem could be a broken wire somewhere, a faulty sensor, ignition switch or the PCM itself. Am I missing something crucial?
Any help hugely appreciated!