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98 Cherokee 4.0 automatic. Came in with a P0123 and a couple of 700 codes. I should have kept documentation on those but I didn't. Changed out a bad TPS test drove and cleared codes. 2 hours after the customer picks it up he returns. It is running rough and does not want to shift. We now have codes P0122, Tps signal low. P0123, TPS signal High. And 89 description unavailable. I have never seen a 2 digit code from Obd II.

 

Diag. on the codes say do the high first. Followed procedure to the point of replacing the PCM. I did with no changes. The low side proves the same TPS and circuit wiring and replaces the TCM. Which I am now reluctant to do. I believe what ever is causing this Mystery 89 code is the source of my problem.

 

Tech support for my OTC scanner say its a Chrysler code. Local Chrysler techs say not one of theirs. Any Ideas out there?

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Posted

98 Cherokee 4.0 automatic. Came in with a P0123 and a couple of 700 codes. I should have kept documentation on those but I didn't. Changed out a bad TPS test drove and cleared codes. 2 hours after the customer picks it up he returns. It is running rough and does not want to shift. We now have codes P0122, Tps signal low. P0123, TPS signal High. And 89 description unavailable. I have never seen a 2 digit code from Obd II.

 

Diag. on the codes say do the high first. Followed procedure to the point of replacing the PCM. I did with no changes. The low side proves the same TPS and circuit wiring and replaces the TCM. Which I am now reluctant to do. I believe what ever is causing this Mystery 89 code is the source of my problem.

 

Tech support for my OTC scanner say its a Chrysler code. Local Chrysler techs say not one of theirs. Any Ideas out there?

It's a glitch, not a real code or anything that I know of or found. Try clearing codes and see if it returns. Chances are it won't. Hope that helps. Gonz

Posted

All the wiring proves out . No short to ground, power or each other. Good continuity. Good ground on all components. Solid 5 volts at TPS. 0.6v at idle from sensor 4.7 volt at WOT. No voltage drop from signal at PCM or TCM. And signal is clean and linear with a scope. Still I have codes for High and Low voltage. And this 89. I think there is a valid fault that is not being interpreted correctly by the scanner or PCM.

Posted

Try unplugging the Clock spring in the steering column for the Air Bag. It is an known issue on these Models that the Clock spring can affect the Ground for the TPS Circuit and it causes all kinds of drivability issues including P0122 & P0123 Codes.

 

I know it sounds stupid but just try it and report back to us and let us know what the outcome is.

 

Thanks

Posted

Try unplugging the Clock spring in the steering column for the Air Bag. It is an known issue on these Models that the Clock spring can affect the Ground for the TPS Circuit and it causes all kinds of drivability issues including P0122 & P0123 Codes.

 

I know it sounds stupid but just try it and report back to us and let us know what the outcome is.

 

Thanks

 

Second this, if you have thoroughly tested everything else.

Posted

Sorry. Borrowed another scanner came up with a P1694. Changed out the TCM and It shifts now but still sputterrs with P0123 as the only code coming up. Had to push it aside for a bit and will be back on it today.

Posted (edited)

Turns out that the tech. temped the TCM into place. Once properly installed and grounded the repair was complete. 89 was a code the scanner could not interpret. P1694 also leading to the TCM. Hopefully this helps some one else down the road.

Edited by cdhowell
Posted

I've seen 2 other cars before with modules not completely tightened down that was causing issues. Temping as a tech to partially put a car back together to verify repairs before completely reassembling...

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  • Have you checked out Joe's Latest Blog?

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      It always amazes me when I hear about a technician who quits one repair shop to go work at another shop for less money. I know you have heard of this too, and you’ve probably asked yourself, “Can this be true? And Why?” The answer rests within the culture of the company. More specifically, the boss, manager, or a toxic work environment literally pushed the technician out the door.
      While money and benefits tend to attract people to a company, it won’t keep them there. When a technician begins to look over the fence for greener grass, that is usually a sign that something is wrong within the workplace. It also means that his or her heart is probably already gone. If the issue is not resolved, no amount of money will keep that technician for the long term. The heart is always the first to leave. The last thing that leaves is the technician’s toolbox.
      Shop owners: Focus more on employee retention than acquisition. This is not to say that you should not be constantly recruiting. You should. What it does means is that once you hire someone, your job isn’t over, that’s when it begins. Get to know your technicians. Build strong relationships. Have frequent one-on-ones. Engage in meaningful conversation. Find what truly motivates your technicians. You may be surprised that while money is a motivator, it’s usually not the prime motivator.
      One last thing; the cost of technician turnover can be financially devastating. It also affects shop morale. Do all you can to create a workplace where technicians feel they are respected, recognized, and know that their work contributes to the overall success of the company. This will lead to improved morale and team spirit. Remember, when you see a technician’s toolbox rolling out of the bay on its way to another shop, the heart was most likely gone long before that.
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