Hi Everyone,

My 01 XJR recently returned from six months in storage and I have been battling a number of issues.

The car started and drove fine initially however after some time idling, the restricted performance light came up on the dash and it started running very rich. Eventually the engine stalled and the car has refused to start since. I presume this was just a dirty MAF as my garage is very dusty.

I've cleaned the MAF, replaced the plugs, pressed the inertia switch, adjusted the shift cable, charged the battery (this is one year old), done a hard reset and cleared the codes.

The car cranks but does not start. The only symptoms I can observe are a P1517 P/N Safety Code and a P1230 Fuel Pump Relay Malfunction. Immobiliser seems fine. The only weird issue I can see is that the shifter does not illuminate in any position. P normally glows red. The red LED on the shifter illuminates when locking and unlocking the doors. The engine does not crank when the shifter is moved to neutral. The restricted performance message is still on the dash despite the hard reset. I presume this will clear once the car starts.

I can jump the fuel pump relays and make the pumps run however they do not run with the ignition on, only momentarily whilst cranking.

I have cleaned the microswitches inside the shifter. I cannot think what else it might be. The issue has been present for the past month and I am at a loss as to the next step. Any advice would be greatly appreciated.

 

Obviously I can only guess, but I am thinking along those lines:
There should also be a "switch" on the transmission, which reads, in which gear the transmission is. Which means, there could not only be an issue in the J-gate but also with that "switch" on the transmission, which seems to be called "rotary switch" - and here is more about that:

https://www.jaguarforums.com/forum/x...oblems-192893/

So I am thinking along the line: If your Jag is in P, but "thinks" it is not, you obviously will not be able to start the XJR, as it starts only in P or maybe in N as well...

 

Thanks Peter. I will take off the rotary switch tomorrow and have it tested. I’m thinking that this is the issue as the reverse lights are also not working. I can’t see any issues with the J gate and it seems to be functioning correctly.

 

This 01517 - It does look like the rotary switch is playing up. The current state - ECU has inhibited fuel supply.

 

Thanks for your response Sean.

The supercharged cars use the Mercedes gearbox which does not have a rotary switch. I've swapped the top section of the J gate for one from the wrecker but there is still no illumination on the shifter and I am getting the same P1517 code. Apparently the XJR only uses the shifter mechanism itself to determine what gear it is in.

I am at a loss as to what it could be.

 

Well, here is a case of MICE being the culprids...:
https://www.jaguarforums.com/forum/x...n-code-193654/

and another link, where they basically suggest the some - just without mice:
https://www.autocodes.com/p1517_jaguar.html
Neutral position switch damaged or harness damaged or electrical contact issue.

So it would be a matter of confirming that the lever in the P position actually does transmit the signal of it being there (in P) to where the signal is supposed to go...

 

If the illumination module is toast the car wont start, have you realigned the linear switch?

 

Just to the right of the rotary switch, there’s a rectangular black box. This box has some adjustment available. It is possible to remove the black box and clean all the brass. Time and patience are key when going up against something this fragile.

 

all you need to do is ground the PNP wire going from the ECM, then you will get injector pulse back and the car will start. throw a dual linear switch at it problem solved