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Jeep Wrangler Engine Troubles

17 messages,  Last post on Oct 24, 2011 at 10:49 AM

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What is this discussion about? Jeep Wrangler, Engine, SUV

Messages Page 2 of 2

#9 of 17 1993YJ, w/2000TJ motor DTC ??? by kidstoys

Oct 17, 2010 (2:42 pm)

Hi I have a 1993 Jeep Wrangler with a 2000 year 6 cylinder motor, Automatic transmission, California emissions. The wiring harness is formed from both years and ebay purchases. I narrowed down my wiring problem to the shut down relay. It is on prior to starting. Then it stays off once the key goes to the start position. The circuit does not re-energize until a couple of seconds after the key is released, and the engine stops running. I'm sure it is PCM related as the PCM controls the shut down relay. I attached a DTC ODB tester. Found codes for O2 Sensors. Added relays for the sensors cleared codes. That error code is gone. On one occasion I checked DTC codes and found a “P1686” no response from SKIM code. Cleared the code at the time and it has not returned since. The wiring harness contains no Security Key Immobilizer Module (SKIM) or Air Bag Control Module. Vehicle starts runs a few seconds and shuts off. Currently no ODB error codes show up during this cycle.
The P1686 code relates to the SKIM it is an added option.
Does anyone know if a DRB III unit can reprogram the PCM for SKIM does not exist? Are there any aftermarket ODB units that can do the same type of programming? Are there any other options to get around this error condition?

#10 of 17 Re: 1993YJ, w/2000TJ motor DTC ??? [kidstoys] by mac24

Oct 18, 2010 (9:50 am)

Replying to: kidstoys (Oct 17, 2010 2:42 pm)
Does anyone know if a DRB III unit can reprogram the PCM for SKIM does not exist? Are there any aftermarket ODB units that can do the same type of programming? Are there any other options to get around this error condition?
 
No, unfortunately it can't. All diagnostic paths eventually lead to 'Faulty SKIM - Replace' or 'Faulty PCM - Replace'.
 
While there are solutions for other vehicle's PCMs, such as EFi Live, there's nothing I know of for the Wrangler; there's just not the market for it.
 
The most practical solution is to install a SKIM in the harness by the column, and tape a matching PassKey to it (or install a cylinder to match the key and use it as normal).
The lack of an airbag module will continue to throw a code but won't cause any drivability problems.

#11 of 17 Re: 1993YJ, w/2000TJ motor DTC ??? [mac24] by kidstoys

Oct 18, 2010 (4:03 pm)

Replying to: mac24 (Oct 18, 2010 9:50 am)
Thanks Mac, Good answer... I also got to thinking that if the Security Key Immobilization Module was an option on the 2000 year Jeep. Maybe I could purchase a new PCM and have it programmed with all of the rest of the Jeep's features and leave out the SKIM's as an optional feature. It looks like 2000 was the first year the SKIM's was used. Possible ???

#12 of 17 Re: 1993YJ, w/2000TJ motor DTC ??? [kidstoys] by mac24

Oct 19, 2010 (9:20 am)

Replying to: kidstoys (Oct 18, 2010 4:03 pm)
No, the SKIS (Sentry Key Immobilizer System) was an option from '98 on; I have it on my '99.
The reason I suggested adding a SKIM + key was that it might be easier and cheaper to find than a PCM. However, it would still have to be matched to the PCM with a DRBIII.
 
A new PCM is an option, as is one from a '97 before the SKIS was introduced.
The only problem with a '97 is that it's OBD system is unique to that year, kind of an OBD 1.5.

#13 of 17 Re: 1993YJ, w/2000TJ motor DTC ??? [mac24] by kidstoys

Oct 20, 2010 (1:22 pm)

Replying to: mac24 (Oct 19, 2010 9:20 am)
Let say the least expensive way to get around my staying running issue is to install the SKIS system. What vehicles, years would I have to choose from that have the SKIM (Security Key Immobilizer Module) compatible with the PCM (Power Control Module) that I have from the 2000TJ ??
 
Shy of changing out my 1993 steering column how would I set up the module antenna and key to work together? I haven't seen the wiring diagram for the antenna. The wiring diagram that I have shows the module with connections to the data set ,ground, and PCM.
 
I may get a better idea of what I'm dealing with once I get into taking one out of a vehicle at an auto recyclers yard. I hope to get lucky and get a system supplied with two ignition keys. But, if you have an idea on compatibility that would be very helpful in my search.
 
Thanks for your time...and replies

#14 of 17 Re: 1993YJ, w/2000TJ motor DTC ??? [kidstoys] by mac24

Oct 22, 2010 (9:01 am)

Replying to: kidstoys (Oct 20, 2010 1:22 pm)
The SKIM plugs in to the harness on the column, which means you'd need the body harness if you don't already have it. A SKIM different to the original needs to be authorized by the PCM which is accomplished with a DRBIII.
I don't think the year of the SKIM matters but I'm not 100% sure of that.
 
Maybe another PCM (secondhand) would be easier if you can get one from a vehicle without SKIS as original equipment?

#15 of 17 Re: 1993YJ, w/2000TJ motor DTC ??? [mac24] by kidstoys

Dec 01, 2010 (8:13 pm)

Replying to: mac24 (Oct 22, 2010 9:01 am)
mac24, Thanks for your help. I finally have the 1993 Jeep YJ running with the 2000 Jeep TJ 4L motor, auto transmission, transfer case and a few other items in it. The only major hitch was the PCM from the 2000 was indeed looking for the SKIM module. The least expensive and sure cure was to send the PMC to Auto Computer Exchange in Florida. After making a phone call to their shop I drafted up a note with an explanation of my predicament. Boxed up the PCM along with the note and sent them their way. The $150 charge saved a lot of guess work and searching for something that may or may not work. They reprogrammed the PCM to not scan for the SKIM module. I just received the updated PCM unit back (about one week turnaround). Once installed the 1993 fired right up and stayed running as it should.
  
     Today I was in ordering some other parts at my local Jeep dealership and I went over the story with the counter person. He said the dealer parts department uses the same place for PMC reprogramming.
 
www.autocomputerexchange.com/Home

#16 of 17 Re: 1993YJ, w/2000TJ motor DTC ??? [kidstoys] by mac24

Dec 02, 2010 (6:56 am)

Replying to: kidstoys (Dec 01, 2010 8:13 pm)
He said the dealer parts department uses the same place for PMC reprogramming..............www.autocomputerexchange.com/Home
 
Good find! It's funny that the dealer uses them too.
Speaks volumes for where Jeep is now at.

#17 of 17 93 wrangler stalls when stoping by musicalley

Oct 24, 2011 (10:49 am)

My Daughter just bought a 1993 Wrangler..6 cly and auto trans. When she pulls up to a stop at times the engine stalls ( shuts down ) and check engine light at times but not always will light up. She has taken it in 3 times...no computer codes are showing up. Any ideas would be great Thanks,

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