Question about Jaguar XJ6

7 Answers

Car XJ40. Model Year 1992 When the engine is started, the gearbox light remains on. The car runs on safe mode and the gears do not change. The gearbox and torque converter have been overhauled. A transmission ECU bought on E-bay has replaced the old one. The problem remains the same.

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  • 2 more comments 
  • ddaby Mar 10, 2009

    The gearbox has been repaired by an expert who placed it on a test bench for 24 hrs and nothing wrong was found. he only shipped it back to Mauritius after being sure that there was nothing wrong with it. The wiring has been checked on the car. I have been told that there is a positive current in the kickdown when there should have been a negative current.

  • ddaby Mar 10, 2009

    All wires have been renewed and even the selector switch has been replaced.

  • ddaby Mar 10, 2009

    Before posting the problem, all the solutions suggested so far have already been tried with no satisfactory results

  • ddaby Mar 18, 2009

    My problem has not been solved

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7 Answers

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  • Jaguar Master
  • 19,396 Answers

Check the transmission range sensor, if you already serviced the torque converter and the ECU is fine, you may need to replace the gear box.

Ensure gear box fluid is at level.

Posted on Mar 10, 2009

  • 3 more comments 
  • Ginko
    Ginko Mar 10, 2009

    If there is a positive current in the kickdown when there should have been a negative, that is a wiring problem, evidently the wiring had not been tested and fixed completely.

  • Ginko
    Ginko Mar 10, 2009

    If you mean that you have +12 Volts on both sides of the kickdown switch, then that usually means that the switch is shorted inside (blown) replace the switch that costs a few dollars.

    If the switch is OK when tested, then you have a wiring problem, go back to my previous comment and have wirings done.

    Replace the switch first.


  • Ginko
    Ginko Mar 10, 2009

    If you have +12 Volts on both sides of the kickdown on all conditions, then it is not true that all the solutions had already been tried, that means that the switch is faulty, and you have not replaced the switch.

  • Ginko
    Ginko Mar 10, 2009

    Hi emissionwiz, can you confirm my theory, the user stated : " I have been told that there is a positive current in the kickdown when there should have been a negative current"

    I think that means that the switch does not open because it is shorted inside (had blown) , the user does not seem to take in consideration my comments, I do not know if he is not reciving the comments.


  • Ginko
    Ginko Mar 10, 2009

    Also if you already replaced the kickdown shift, and the kickdown still returns +12V on both ends on all conditions, then the switch had blown again, check kickdown wiring, and you may also need to replace the coil connected to the kickdown, that can cause the switch problem.

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  • Master
  • 10,515 Answers

The transmission might just be low on fluid. Check the fluid level when the fluid is warm and the engine is idling in park. If low, add fluid to top it off.

If it still slips and the light remains on, you need to take it to a transmission shop to have the transmission diagnosed.

Thanks.

Posted on Mar 18, 2009

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  • Master
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First... you need to find out what the codes are (even if the check engine light is not on)... cycle the key on and off three times ending with the key on. count the times the check engine light flashes and write them down. or if you live near autozone they will scan the codes for free.

after you have scanned the codes ... reset the computer so you are no longer in "limp home" mode. this is done by unhooking the battery for about ten minutes and then hooking it back up. a word of caution if the radio is of the anti-theft type make sure you have the code to reactivate the radio.

there is a TSB about that problem but it seems to be only in wet weather and i'm not certain that applies... let me know on that.

the next suspect would be a relay... i've looked through the diagram for all three fuse panels and have not located one tho there may be one in the fuse panel located in the engine compartment.

Robert

Posted on Mar 10, 2009

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  • Jaguar Master
  • 4,369 Answers

I would think you could have a repair shop run the fault codes and tell you what the issue is. It sounds like a failed sensor is putting it in safe mode.
eg.s
vehicle speed sensor
transmission sensor

Posted on Mar 10, 2009

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  • Master
  • 6,784 Answers

The problem is the eBay part. its not working correctly. I suggest purchasing a ECU from the dealership. this is best.

Posted on Mar 10, 2009

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  • Expert
  • 70 Answers

Hi,

well you can look at this manual for some help :)

www.arh.ee/jaguar/Xjs_help.doc

Hope this helps.

Posted on Mar 10, 2009

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  • Jaguar Master
  • 60,792 Answers

The most likely cause of this problem is the wiring harness to the gearbox case connector, pull the harness connector off at the box and look carefully for ben loose or corroded pins, corrosion will be green residue, if u don't find anything u will have to check the continuity of each wire from the gearbox to the ECU and make sure each wire is less that 3 ohms.

Posted on Mar 10, 2009

  • 1 more comment 
  • yadayada
    yadayada Mar 10, 2009

    could u provide the information about the wiring before I give advice?

  • yadayada
    yadayada Mar 10, 2009

    are u sure the caliration of the EPROM in the new ECU is the corect one for your car?

  • yadayada
    yadayada Mar 10, 2009

    hads a OBD 1 trouble code test been run on the ECU? has a live data been done with the factory scanner?

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