hi everyone, I took my car to a repair shop that has a jaguar certified software, and I have the TPS out of range code, which is causing my hesitation on startups and acceleration. I just purchased a new TPS sensor and I personally installed it, but the guy at the shop told me that these sensors need to be positioned and need to be turned a certain way to work properly. He said said you need a jaguar computer in order to position it correctly. he said its not just a "plug in" sensor. Can anyone please advise if this information is correct? thank you.

 

Yes, you will have to have it set at a dealer. I also changed the TPS, but the idle went up to 1300rpm and couldn't fix it by myself. The only way to fix it is to bring the car to a dealer.

 

What about at a jaguar shop that has jaguar software?

 

Read the entire TSB and follow the instructions for THROTTLE ADAPTATION on Page 12 of the bulletin. It is not difficult and it has been done THOUSANDS of times by dealer employees. I have not needed to do this in a few years but if you have access to WDS or IDS then it can be done. If they have Jaguar certified software then I guess they don't know how to use it.

bob gauff

 

you dont need IDS or to go to the dealer. You pin the signal wires with a dvom and turn it(the TPS) to get a .6volt reading at idle. And yes you dont need the engine running or the throttle body on the car. Just the sensor hooked up and the key on, and throttle at the idle position. You can turn the TB over to access it easier

 

Brutal
You are thinking of the XJ40 TPS with slots to adjust. The X300 just has holes to mount it and the ECM is told where the idle setting is with the 'throttle adaptation' in vehicle configuration. WDS will ask if a NEW TPS has been fitted and you answer 'YES" and follow onscreen instructions.

bob gauff

 

Nope, ive done both ways. At work on ids(or pdu ) and ive also set up at home in the garage on my neighbors when i cleaned and repaired his stuck tb and replaced his tps. Yes its not slotted like the older ones but it does adjust as well since the holes are not "exact"

 

I guess I never tried to adjust because I used WDS/IDS at the dealer and I have WDS here at my shop. I just do the throttle adaptation.

bob gauff

 

Hey, thanks Brutal for that info...
I have been living with high idle for 6 months due to a reluctance to have to go to dealer for calibration.
Will give it a go at next service.
Thanks once again

 

dont confuse this with a throttle blade sticking from deposits and or a weak throttle return spring

 

yes, throttle body has been off several times, new stepper motor, swapped coolant temp sensor. Only thing I haven't touched is TPS due to needing recalibration. Now I know voltage needed, we can have a look at that too.
About the only thing I haven't touched.
Thanks again...even if it doesn't solve issue, it will eliminate 1 more possibility.

 

Brutal:
where do you get the adjustment you refer to? Maybe another TPS fits the application, becaisuse my TPS has NO play in the screw holes. I even thought about slotting the holes, but thanks to motorcarman, I got my WD working and got the idle straightened out.

 

Second on Brutal,

Can you explain further if your maybe using another TPS in the 1995-1996 XJ6? I cleaned my throttle body this weekend (it was horrible looking inside). I had to spray carb cleaner, let it sit, toothbrush and repead for about 30 minutes. Unfortunately I did not have the foresight to remove the TPS, and I think carb cleaner leaked down into it and effed somthing up. IT ran GREAT when I got done, but by the next day it just wont upshift out of 2nd gear. Starts and idles great, but it SCREAMS at nearly redline RPM at 60 or 70 mph. Get off the gas and then RPMs stay hight and drop very slowly. I checked the Throttle spring and everything physically works good, I think the sensor cannot tell though.

IF if buy a new TPS sensor online and install, am I screwed without the proper equipment? Do I HAVE to take it to the Jaguar Dealership or can I take it to a "local" mechanic? I tell you there is NO play in the TPS once it is mounted to the Throttle body. I am thinking maybe there is another TPS i could swap in?!?!? ONe I have says "Ford 70418A" on the TPS.

 

Here's a couple of shots of what's on my 1995 VdP;

 

Yes it is pretty much bolt on. But you can check signal voltage. And ive found i can not only tweek to bring in a tenth of a volt. But if youre off more than that you can drill the holes a little larger and get more of a range to adjust. But not only using ids for engine setup does it set tps, it also sets kickdown for trans and orientates all 02 sesnors and this is by far moreat issue.
On the shifting, yes the trans/ecu look a the tps for shifting and a code(if stored) can show in the tcm and ecu. The throttle return spring can look fine and be weak(just like bad xtype battery cable that everyone wants to replace alternators for) take the throttle cable tower off and wind the spring 1 turn more to increase tension. And you should take off the tps and clean the shaft and bore and hope you didnt get oil and cleaner down inside and ruin it.

 

Many thanks Brutal, fellas like you taking the time on here really help us garage mechanics out!

I tested the TPS with a voltmeter and it showed .5 up to nearly 5 volts from the left peg, and 4.85 down to .5 from the right peg. It seemed to work, but I dont think its working

I am going to buy a code reader this week and see if anything pops on that, there are no lights illuminated, but I hope there is codes.

I really think I got carb cleaner down in the TPS because I had to soak it so much and i had it sitting upright on my workbench. It must have gotten in there. Like I said starts and idles fine, goes ok up to about 40-50 mph then no torque convertor lockup and it just seems to stay in 2nd or 3rd gear and wont upshift into higher gear. Its got tons of getup and go, but the RPMs just scream and wont go down. Also RPMs stay up after I let off the gas.

Will see what the code reader shows and post it. I a warning to anyone cleaning Throttle body, turn it upside down or remove TPS sensor when cleaning!!!

 

The reading should be .6volts, and youre looking for drop out in the range from open circuit and for that you can watch the bargraph on the bottom of a fluke dvom or need a oscillascope

 

where should by 0.6 volts? its got 3 wires between which wires?

 

Thanks Brutal,
Have finally reduced idle from 1500to 800 rpm by tweaking tps as per your instuctions above.
Removed throttle body and slotted the mounting holes on tps with a jewellers file.
Set to get reading of 0.6v and replaced on car. Still idling fast. With car on hoist managed to loosen tps from below, (removing oil filter momentarily), then with engine idling (with oil filter back on), manipulated tps position til idle decreased to 800rpm, then switched off engine, removed oil filter again, tightened up tps screws. Now all is good (fingers crossed). I haven't rechecked voltage reading but got the required result with the manual adjustment. Thanks again, you have saved a trip to the Jag Doctors.

 

I appreciate your update and thanking Brutal . It's good for you and happy driving