97 ZJ 4.0L Blowing ASD fuse - Jeep Garage - Jeep Forum

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Old 01-24-2016, 01:35 PM
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97 ZJ 4.0L Blowing ASD fuse

When started it will run for aprox 15 seconds and shut down. The 15a ASD relay coil circuit fuse will be blown. The first new fuse will sometimes get it going and sometimes it will blow again.

When the ASD fuse blows the compressor clutch will engage at all times with the ing / key in run.

When I found out the clutch was engaging at all times, when the fuse is blown, In a process of elimination, I disconnected the a/c control panel, pressure switches and clutch connector and plugged them back in one at a time with a new fuse and the engine running. The fuse did not blow.

No fuse has blown once it gets past 15 seconds of running time.

The last thing I did was pull the compressor relay ( to hopefully reduce the amp draw across the fuse ), put in a new fuse and it kept running. It has not blown the fuse again since pulling the clutch relay. This was like 4 days ago.

That's all the symptoms I've seen so far.

I looked at the wiring diagram and see that the ASD relay coil circuit is a straight shot from the PCM on the ground side and the 12v+ is spliced ( Splice S101 ) with the compressor clutch relay, fuel pump relay, pcm, bcm - all on the relay coil side & the duty cycle evap purge solenoid. The 12V+ side is fed by the power distribution center circuit F99 which is fed by the ignition switch in start and run which is fed by fuse #8 / 40A in the PDC.

What throws me is:
* Why the compressor clutch stays engaged at all times with the ingition in the run position when the ASD fuse is blown or removed.
* Why the fuse doesn't blow after 15 seconds of engine running time have passed.

New info. I was just informed that the fuse blew again. This time with the a/c relay still removed. And, as usual, after starting and with 10 seconds of run time.

Thanks

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Old 01-25-2016, 06:08 AM
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Re: 97 ZJ 4.0L Blowing ASD fuse

I donŽt know the ZJ, but just trying to think with you.
So is the same fuse, which is feeding the ASD relay coil, also feeding the compressor relay coil? That would sound strange at least, because when the fuse blows, then there is no more power to energize the compressor relay and the compressor clutch should be de-energized?
But since the fuse now still blows without the compressor relay installed, the problem should be somewhere else.
Any change to attach the wiring diagram, to better understand what can be going on?
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Old 01-26-2016, 07:08 PM
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Re: 97 ZJ 4.0L Blowing ASD fuse

I couldn't attach the diagram because I couldn't separate the pages in the pdf file. I was able to identify the circuit clearly and I ran it down. I didn't find any chaffed spots. No exposed wiring touching anywhere. No damage to insulation anywhere. I decided that one of the oxygen sensors may have been at fault so I changed both. That was yesterday. I put the clutch relay back in and, after multiple start ups, it hasn't blown a fuse yet. Lets cross our fingers.
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Old 01-27-2016, 12:53 PM
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Re: 97 ZJ 4.0L Blowing ASD fuse

If you would like to extract one page from a PDF file, you can use the free app "CutePDF writer". When installed, you just click on print and choose "CutePDF writer" as printer. You can then extract one page or several pages, as you like.
Regarding the O2 sensor heaters, are they in the same circuit as the ASD coil? I know that they are switched via the ASD relay contact, but that circuit has normally an other fuse.
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Old 01-28-2016, 01:52 PM
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Re: 97 ZJ 4.0L Blowing ASD fuse

I installed CutePDF but cannot find the file it's saving the doc to. I do not get a save as prompt when printing as their support page says.
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Old 01-28-2016, 05:15 PM
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Re: 97 ZJ 4.0L Blowing ASD fuse

EZG_8WL1.pdf
EZG_8WL2.pdf

I figured it out. I was missing the ghost writer program.

So it blew the fuse again. Nothing new was done since the O2 sensor change outs.

To be clear the fuse blowing is #20 - 20 amp - in the PDC ( circuit F5 )

What I see is fuse 20 - 20A in the PDC feeds a signal pin to the PCM and the ASD relay latch contacts. The ASD latch contacts feeds a separate PCM pin on circuit A142 and splices S128 & S129. S128 feeds the unswitched positive side of al 6 injectors and S129 feeds the ignition coil and both O2 sensors.

That's al I see that circuit feeding.

How do I attach the files so they are viewable in the post instead of just attached files?
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