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It's in the "Limp Home" mode?

Tiny
KIM BARTRON
  • MEMBER
  • 1994 JAGUAR XJ12
  • V12
  • 2WD
  • AUTOMATIC
I recently repaired a 1994 jaguar xj12, I put a new primary coil on then I had to replace defective mufflers that were blown out. The owner let the car set for 6 years with this problem. After I did this I went to return the car, when it went 1 mile it died. I brought it back, Iwent through the steps to diognose the problem and found that the primary fuel pump was not putting out the right amount of pressure. I then put a new pump in and it ran fine in park for 2 hours. Ireved it up, I shut it off and started it right back up, I put it in gear and drove about 3 blocks and it died. I believe it sent the false message from the trans that it was heating up. It didn't go far enough to even get hot. I believe that it sent a false message that it needed to go into the" limp home mode ". How can I override these codes?
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Thursday, November 18th, 2010 AT 6:16 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
When the vehicle goe into limp mode, it is due to a fault in the system and you need to retrieve the trouble code to diagnose and rectify the fault. There are no overriding means if there is a fault in system.

RETRIEVING CODES
4.0L
When a system fault has been detected, trouble codes can be retrieved. Vehicle must be stationary. With ignition switch in OFF position, wait 5 seconds and then turn ignition switch to position II. DO NOT start engine. Press and hold Vehicle Condition Monitor (VCM) button, located on VCM/trip computer display panel. VCM/trip computer display panel is located below tachometer and speedometer.

Applicable trouble code will be displayed on display panel. When engine is started, trouble code will be deleted from written display, but CHECK
ENGINE light will remain on.

6.0L
When a system fault has been detected, trouble codes can be retrieved. Vehicle must be stationary. With ignition switch in OFF position, wait 5 seconds and then turn ignition switch to position II. DO NOT start engine. Trouble codes will be displayed on trip computer display. When engine is started, trouble code will be deleted from written display, but CHECK ENGINE light will remain on.
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Thursday, November 18th, 2010 AT 7:41 PM

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