XJ error code P0340

[kyphonii]

Update
It still stops after a few minutes if in Park but hasn't stopped when driving for 20 minutes.
Ive only done a few small trips but what is it ???

also runs rough when you restart.

Found the clunk, rear gearbox mount.

[kyphonii]

Ok it only stops if it’s idling


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[awg]

Originally Posted by kyphonii

Ok it only stops if it’s idling


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If you can maintain the motor using the pedal, that probably means the IAC is dirty or malfunctioning, as it is the primary device that controls idle

[kyphonii]

Whats involved with replacement of the PCM ECU on a 2001 XJ
What year models will work and what are the look outs to replacing the unit


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[awg]

Originally Posted by kyphonii

Whats involved with replacement of the PCM ECU on a 2001 XJ
What year models will work and what are the look outs to replacing the unit


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I would only consider a '98 or later, preferably the same part num that is on the PCM, which will be 56041 and 3 big numbers..you can see it without removing the plastic case

As I understand it, the later models immoboliser works by your ignition switch sending a matching VIN code to the PCM, so that means either the PCM must have the VIN reflashed, or you need the Ignition switch and key from the seller ( I see they are often sold this way in Oz ebay, gumtree etc)

seek clarification on the this, I am not 100% sure

this means your ignition key will no longer match door keys

[relwell]

Harness connectors/pins all in good condition?

[kyphonii]

Originally Posted by relwell

Harness connectors/pins all in good condition?

As best I can see,
I’ll do a more detailed examination but wiggling all connections doesn’t cause a issue.


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