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  #1  
Old October 31st, 2020, 17:06
jcfinkel jcfinkel is offline
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2001 XJ Sport 4.0 Crank no start Think I made it worse

Good Afternoon Hive!

I have searched the forum a bit and ran through a lot of checks. This is where I stand.

2001 XJ Sport 4.0L Automatic. My Nieces Car.

Driving slow speed in parking lot. Car dies. Crank, no start condition.

In my garage now. Cranks, no start. I can hear fuel pump prime. Fuel at Schrader valve on fuel rail. I used Starter fluid in throttle body while cranking, not even a stumble.

Screams no spark.

Replaced CPS no joy

Tested coil packs, got a fault in 3,4 coil, replaced coil packs, no joy

Checked all fuses & Relays no joy

Swapped a PCM from my 2000 XJ, no joy.

Here is the fun part, swapped 2001 PCM into my 2000 XJ, starts & Dies after 3 seconds (SKIMS right??) but looks like PCM out of 2001 XJ is not the no start issue! Yea!

Put original PCM back into my 2000 XJ, Starts & Dies after 3 seconds. I appear to have killed the SKIMS coding in the PCM?

So I now have 2 non running XJ's in my driveway......

ANY insight into EITHER XJ issue would be HUGE!!!!!
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  #2  
Old November 1st, 2020, 06:51
asymptonic asymptonic is offline
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Re: 2001 XJ Sport 4.0 Crank no start Think I made it worse

No codes?
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  #3  
Old November 1st, 2020, 07:13
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Tim_MN Tim_MN is offline
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Re: 2001 XJ Sport 4.0 Crank no start Think I made it worse

Do the fuel gauge and voltage gauge work or display properly during the no-start ?

Is or was the Check Engine Light ON ? What CEL trouble codes are present, or were recently observed ?

CPS = CRANKshaft Position Sensor ? You bought a genuine Jeep CPS and not a crappy Chinese clone CPS, right ? Have you inspected, tested the CAMshaft Pickup Sensor and related wire plug and wire harness ?


The anti-theft Sentry Key Immobilizer System SKIS/SKIM is comprised of the chip-in-key reader device (SKIM), the chipped keys, and the initialized PCM programming (SKIS). If you put a non-SKIS enabled PCM into a SKIM equipped Cherokee, the SKIM programming will LOCK UP the swapped in PCM because it thinks somebody is trying to bypass the chip-in-key to steal the Cherokee.

All 97-01 PCM's have the Sentry Key Immobilizer System present but the program is not active unless it is enabled with a DRB-III Scan Tool, or it is self-enabled by any PCM swap or PCM swap theft attempt.
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Quote:
Originally Posted by bimmerjeeper


Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.

Last edited by Tim_MN; November 1st, 2020 at 16:24.
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Old November 1st, 2020, 12:40
lawsoncl lawsoncl is offline
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Re: 2001 XJ Sport 4.0 Crank no start Think I made it worse

Try this?
https://itstillruns.com/reset-anti-t...e-7580947.html
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Old November 1st, 2020, 16:28
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Tim_MN Tim_MN is offline
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Re: 2001 XJ Sport 4.0 Crank no start Think I made it worse

IIRC those steps re-initialize the rolling code algorithm of the key-less entry module in the Cherokee to the keyfob remotes.

Changing the PCM ROM, enabling SKIS/SKIM, or unlocking a SKIS locked up PCM requires the use of a DRB-III Scan Tool.
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Quote:
Originally Posted by bimmerjeeper


Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.

Last edited by Tim_MN; November 18th, 2020 at 16:03.
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  #6  
Old November 2nd, 2020, 07:16
75SV1 75SV1 is offline
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Re: 2001 XJ Sport 4.0 Crank no start Think I made it worse

Did you check the injectors with a NOID light? See how they react. I had this issue with a 2000. The NOID light would flash when I let off the key. By someone's suggestion, I replaced the ignition key relay. Check NAPA's price. I remember $50.
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Old November 18th, 2020, 12:30
jcfinkel jcfinkel is offline
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Re: 2001 XJ Sport 4.0 Crank no start Think I made it worse

Thank you for the insight.

Turns out Nieces XJ needed a CAM synchro.

My XJ needed the PCM SKIM deleted.

Both jeeps back up and running.

Best

J
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