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Old 01-12-2019, 09:28 AM   #1 (permalink)
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1995 wrangler 2.5

Got a issue where it will not start unless I jumper the ADS relay.
I have a new CPS and checked power to the coil and the CPS and all is good with relay plugged in. But the jeep will not make a spark and no start up.
But if I jumper the ADS relay 87 to 30 it will spark and start right up.
I know its something simple but where do I start?
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Old 01-12-2019, 11:49 AM   #2 (permalink)
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Have you tried to plug your horn relay into the asd relay spot? You could have a bad relay.

Also check fuses in that panel and under the drivers dash. Report back
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Old 01-12-2019, 12:34 PM   #3 (permalink)
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Yeah I swapped around relays and all fuses are good.
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Old 01-12-2019, 12:46 PM   #4 (permalink)
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No crank? or crank/no start?

Auto or manual
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Old 01-12-2019, 12:48 PM   #5 (permalink)
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it will crank..... Just no start no spark... fing auto.
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Old 01-12-2019, 01:45 PM   #6 (permalink)
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Test the Cam sensor in the distributor with a volt meter (google for test procedure) I'd bet that is the issue. The distributor must be removed and disassembled to swap, but can be tested at the plug IIRC.

You have tried cranking with a shot of ether, right?
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Old 01-12-2019, 04:53 PM   #7 (permalink)
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Is it an all the time thing or intermittent? The 2.5 PCM was bad about burning up capacitors in it. There are 3 of them, very easy to replace. Its a cheap $10 fix, and it works great. Many threads on various forums about it.
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Old 01-12-2019, 05:11 PM   #8 (permalink)
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Quote:
Originally Posted by engnmonkey View Post
Test the Cam sensor in the distributor with a volt meter (google for test procedure) I'd bet that is the issue. The distributor must be removed and disassembled to swap, but can be tested at the plug IIRC.

You have tried cranking with a shot of ether, right?
You dont have to take the dist out to change the cam sensor.....

Pop the cap and then pull the rotor and cam sensor comes right out,..
Its not the fuel issue. Its spark... or lack of spark.


to answer the other question It just started this. shut down one day and no start the next.

Last edited by Merace19; 01-12-2019 at 05:11 PM.
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Old 01-12-2019, 08:36 PM   #9 (permalink)
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Quote:
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it will crank..... Just no start no spark... fing auto.
I have nothing to add, but i have a complete 92 2.5L engine harness, ecm, AX5, or a dakota bell "kit" for a ax15 swap.
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Old 01-13-2019, 06:02 AM   #10 (permalink)
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If the cam sensor was bad, it still wouldn't start with the relay jumped.

I would look for some sort of aftermarket alarm tapped into the ASD relay control circuit or for an open circuit between the relay and the PCM (which grounds it) and ignition on power.
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Old 01-13-2019, 06:31 AM   #11 (permalink)
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Yeah that was my next step. I am a little under the weather right now and brain not processing the wiring and connectors ...

I had someone turn the key to the on spot and the ASD relay trips and immediately trips back. I read that it should trip and hold for 2 seconds before tripping IF it does not see the cam sensor picking up rotation of the dist.

So not sure what that is telling me right now. again brain no functtinofwn...:ma ssey:

Anyone have the pin out for the connector to tthe PCM and the ASM relay so I can check for resistance and continuity?
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Old 01-13-2019, 01:37 PM   #12 (permalink)
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Ok I got to feeling better and went out and messed with some stuff.
I took the connector off the ECM and looked it over good.. It was clean and no issues inside.
I was switching the ASD relay with the horn and got nothing.

BUT when I switched the Fuel pump with the horn BLAM it would crank like normal.

Prior to all this this, the pump would come on like normal for a few seconds and the line had plenty of pressure. I am not sure what would make the ASD relay disengage with the fuel pump relay. I am not going to swap them back around for now. Dont want to jinx it.. May do it after a week or so of normal driving to make sure its not gonna do it again.
Might have been a coincidence that when I pulled the ECM connector it fixed the issue or something else...
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Old 01-13-2019, 02:48 PM   #13 (permalink)
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Not sure if this is related to your issue, but these CPUs had a chronic failure that would cause extended crank to start the motor. IIRC there are like 4 or 6 capacitors on the circuit board that need replaced. The parts cost a few dollars and it is an easy home fix. There are plenty of how-tos out there.
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Old 02-08-2019, 10:50 AM   #14 (permalink)
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figured it out. It was the sensor in the dist that was issue.
I did not change it, just the wires were stretched tight around the dist and I pulled the connector apart and re-run the wires. After that it would crank up no problem. So either there was a short in wire or the connector did not have a good connection.
Run great too... ALL the testing was pointing to the CPS or camshaft position sensor.. But I wanted to be sure before buying anything..
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