ok , so i have to ask does this apply to the x350 - x358 as well ?

https://www.jaguarforums.com/forum/s...ection-176446/

 

I gather P2135 changed meanings depending on the type of PCM (PanPAG or pre-PanPAG). In case it's the acc pedal, I'd be tempted to do another hard reset and then turn ignition on (pos II but I think not start) and gently move the acc pedal full travel and back a few times so the PCM can learn how it behaves.

Easy so maybe worth trying.

 

The battery disconnect/reconnect procedure gets a little more involved as the models have developed over the years. There's also minor differences in the steps between different models.

The X350 Workshop Manual battery reconnect procedure is:

1. Start the engine and allow to idle until the engine reaches normal operating temperature.

2. Switch the engine off.

3. Restart the engine and allow to idle for approximately two minutes (this will allow the ECM to learn the idle values).

4. Apply and hold the brake pedal, select drive and allow the engine to idle for a further two minutes.

5. Drive the vehicle for approximately five miles/eight kilometers of varied driving to enable the ECM to complete it's learning strategy.

6. Reset the audio unit and climate control assembly to original settings to avoid customer complaint.

7. Reset the door window motors.

Notable differences between this sequence and some other Jaguar model procedures are the inclusion of (1) and the lack of throttle travel limit setting.

Done correctly, a disconnect/reconnect (or hard reset) alone cannot induce faults but a coincidental failure of a sensor is not impossible or unknown.

Graham

 

From Jaguar Publication JTP 941/2, (X350) Page 5, Effects of Battery Disconnection;

CAUTION:
Before disconnecting the battery, ensure the ignition is turned off for at least 15 seconds. The battery should never be disconnected with the ignition switched on since this will not allow modules to shut down correctly and will result in fault codes being stored and spurious faults being induced. Ensure a minimum interval of 20 seconds from battery disconnection to battery reconnection.

When reconnecting a battery cable, ensure that the operation is carried out in one clean connection to avoid unwanted electrical ‘spikes’ in the system.

Re-calibrate Throttle Pedal
After battery reconnection, the engine management system must ‘re-learn’ the limits of throttle pedal travel. This is to ensure correct adaptive settings are stored for kickdown operation. Re-programming is done with the ignition switch in position II as follows:

• Slowly press the accelerator pedal fully through the kickdown detent to the floor. Release the pedal and repeat the action.

 

I never thought to ask the OP if the ignition was off when he disconnected the battery. An important point.

Perhaps starting over with a hard reset and then recalibrating his throttle pedal will get him back to square one once all the ground points are checked.

 

I keep finding reference to relay number 12 or 11 for the throttle valve... but my front relay fuse center only has 8 relays in it...any one know which relay is actually for the throttle valve on my 05 xj8 vdp???? fuse 24 is for the throttle, but there is no current there??

 

ground points good... no voltage at fuse 24. ?? odd. car runs with it out?? anyone know which relay in the front fusebox feeds current to the f24 fuse??

 

Throttle motor relay is #12 in the front power distribution box.

 

If this can help:

 

Sorry, I don´t understand. You disconnected negative cable from battery and touched the positive cable (was connected to battery ?) If yes, I think that it is not good idea. All ECUs got +12V on the ground.

 

Can't matter as there's no circuit. Think about it!

 

Any updates No Support?

 

No positive progress yet. All pin tests are coming back ok.. the wiring appears good, the voltages are identical.

 

thanks for all your help... after a new accelerator pedal, a new battery, and a new throttlebody... all is well with my motorcar... wooooohooooo. now only the black touchscreen to deal with.

 

Anybody ever think of taking their car to a factory service center? Or a good independent mechanic? They have knowledge and tools to solve the problem, complicated and delicate Jags can only be maintained/repaired by very few owners.

 

Jags are not delicate nor are they overly complicated from my perspective. If you have the tools and can read service manuals/ electrical schematics, you can do anything on a Jag. To your point, you have to have the tools. This is no different than any other trade and you can teach yourself.

The good folks on this forum are the minority of Jag owners. They have a few things in common. DIY (either because they love it or can't afford to have a dealer do it), love of Jaguars and camaraderie.

If you can fix a chevy, you can fix a jag. My opinion.

I don't let anyone do something I can do myself including home construction, home wiring, plumbing, home painting, appliance repair, car repair, car washes, house cleaning, laundry, grocery shopping. Just the way I was raised I guess.

My first car was a used 64 Chevy Impala SS. I think I got in in 1974. It died one day and I went to my Dad for help. He told me to figure it out myself as the problem could only be fuel/ air/ electrical, but he did help me get a charge on the battery.

It took me two weeks to to figure out that the problem was the alternator.

 

You just described me. If I can do it, I do it. If not, I try to learn it before I pay someone to do something, especially simpler stuff. Many people are lazy today and not willing to put in a bit of time to learn stuff so they pay for it. Their choice.

 

Way back when in the UK I told my father that I was going to rebuild my Ford Cortina 2000 engine. He told me that I could not do that.

I did. Ever since then I do as you do Sean on everything. I even repaired cameras to sell on Ebay and I taught my self by braking a few in the process.

What really gets me is that some people that I know cannot even change a circuit braker in their house main circuit braker panel or similar simple house jobs.

 

Sean if you click on hard reset in SDD in just walks you through the battery disconnect procedure. I would have done it again a couple times before I threw new parts at it. But its fixed now.....................

 

Brutal I agree (post 25) but I think you meant to address this to no support. He was the one having the issue.