Last night, just as I was pulling to my driveway, I got the dreaded Engine System fault, parking brake fault, dsc not available and the car went immediately to limp mode. I shut the car off and restarted immediately but that did not resolve the problem. On the second time, it did. I was able to pull it in the garage.

I did the requisite research and the 3 main reasons for this problem ordered in most likely scenario are:

- Throttle body
- Throttle Position Sensor (TPS - bolted onto the throttle body)
- Dirty throttle body

I pulled the codes using my IDS/SDD setup but there was so much noise I could not tell if there was a related code to the TPS. I shall try again tonite.

By using deductive reasoning, coupled with plenty of reading on this forum, it appears that the most likely culprit for this failure is the TPS sensor. Since this is not a part that Jaguar sells separately, people have expressed that a suitable replacement for the TPS is Denso 198500-3300 which appears to be available on ebay.

A replacement (new) throttle body appears to be in the neighborhood of $900 (checked Gaudin Jaguar which is where I get most, if not, all my Jaguar parts for this car).

Simple question: Can someone confirm using this Denso sensor on their X350 XJR and verify that indeed this solves the problem?

I shall post more information as it becomes available

 

I would just fit the TPS and it should solve the problem for ?$100-150.

If not the TB is available in the UK 102 GBP!

JustJagsUK.com - Jaguar S-Type, X350 Throttle Body - V8 (C2C20540)

 

Thank you meirion1. The throttle body in your link is for naturally aspirated engines. Mine is the supercharged engine and I believe it is a bit more pricier.

 

If your TPS has packed it in you should get the code P2135...

The Denso 198500-3300 is the correct TPS for our cars, also used on the later model S-Type and X-Type throttle bodies. The TPS is the same so don't be put off if the seller says it's for an X-Type....

The aftermarket ones have been used by several members here on the forum, good feedback so far.

I myself had the P2135 and I ended up replacing the whole throttle body with a spare that I bought a couple of years back, because I knew it was a case of when not if...

So a search here on the forum for "P2135" or "198500-3300" you'll find lots of threads on the topic.

 

This problem on our 2004 VDP (not supercharged) was the electrical connector at the back side of the throttle body. The structure of the plug apparently fails due to engine heat. Others have encountered the same problem. I am not sure if the connection is similar on the supercharged models, but it would not hurt to check this out.

Good luck,
Jim

 

That code combination almost certainly indicates a likely Throttle Body issue, though it couldn't hurt to make sure your battery is providing the "full monty" as well. If you only saw those 3 codes and nothing else, I tend to agree with the majority that it points to the TB. As far as the battery? Couldn't hurt to check.

 

The battery is less than a year old and fully charged. This is my daily driver on which I put 50 miles a day minimum.

I ordered a TB from SNG Barratt and I thought the price was quite reasonable! I am going to skip the trial-n-error routine and just replace the whole damn thing. I will be checking the electrical connections and retrofit as needed.

 

yes the guys are most likely correct, when either of the tps pins lose contact the code throws, be careful because the female side of the connection is brittle and will break easily. These are common issues with both SC and N/A x350,because they share the same connection types on the throttle bodies except the SC throttle body is at the rear of the engine mounted onto the pressure plate, and the N/A has the throttle body mounted to the front of the intake to the left of the egr valve. You can squeeze the clamping pins that connect to the throttle just to make them snug, you should be fine. Until next time happen wrenching.

 

So in my attempt to get to the throttle body, I realized that the connector that is connected to the motor section of the throttle body (2 pin connector) had been disintegrated some time back - either by heat or by the po. The TPS connector itself looks fine.

My question is if anyone knows of a source or a part number for this connector. I'd rather get a new one and splice it in especially if I will be replacing the throttle body itself.... see pictures below:

 

I repaired my connector which had disintigrated in a similar manner using J&B Weld. I believe this stopped our 2004 VDP from going into the limp mode on an increasingly frequent basis. At least it has not happened since I did the repair (about a year). I believe that someone on the forum has spliced in a replacement plug although I do not know the source of the part.

You might try this repair before replacing the throttle body as I believe a number have found the plug to actually be the issue. Your throttle body looks pretty clean in the photo.

Good luck,
Jim Harris

 

The connectors are available as spare parts from Toyota

https://www.jaguarforums.com/forum/x...%24%24-133600/

 

Thanks Cambo. However, I am looking at the 2-wire pigtail that connects to the motor side of the throttle body. If I can get an equivalent lead to this pigtail as the one you shared for the 4-wire pigtail, I will be set!

 

This is FYI: From another thread, there was a claim that this connector will fit the 2 wire connector on the throttle body. I just received mine but it turns out it will not fit as is. I may cut slits in the pigtail and see if that works.

 

I did manage to connect the two wire pigtail on the TBS motor connector. It is an extremely tight fit but the electrical connections work as designed. It does not click in place so most likely either heat shrink or electrical tape will have to be employed to further secure the pigtail to the connector. I shall actually cut and splice this connector to my vehicle tomorrow...

 

I heat shrinked mine years ago after having to replace the lower coolant return line below the supercharger. It will work just fine, As a note the connector is part of the ecu harness, so I purchased a entire harness for x350 off ebay and now I have a supply of female connectors for everything from 02 sensors, to tb, to knock sensors etc. Also the 02 sensor connector will break also so be prepared in that event. All in all glad it worked out, until next time happy wrenching !

 

I cut the old connector and spliced in (soldered) the new connector. I put a few miles and everything seems to be in order thus far.





The old connector is snipped off





Wires to the connector are being soldered. Do not crimp. Soldering is the way to go especially in the TBS connector





Heat shrink the connections





Done

 

Good work, hope this solves the problem.

I had to chuckle when you said "solder, do not crimp" there's polarised opinions on this, a number of race car builders down here will only crimp (using Deutsch connectors) they reckon that soldered joints will eventually fail due to heat & vibration...

Don't want to start that argument here. I think solder will be fine, but a high-quality crimp would also be an option...

 

FWIW, I purchased on of these connectors and put it in my spare parts pile to be used when needed and I am confirming that this is a *perfect* fit for the TPS 4-wire connector to the throttle body

 

Just had my two tire TB plug fall apart last night. I was driving home and got the STD. engine systems fault and when I was poking around it decided to unplug the connectors to the TB and the two wire connector crumbled. So in my search for a replacement connector I stumbled upon this thread and found it useful. I also found another possible option other than the plug Lagonia ended up using. I'm going to order some and thought other may have some interest.

SouthBay Fuel Injectors

 

It looks like it is time to replace the throttle body for sure. A little over 1000 miles after fixing the electrical problem described in this thread, the car went into limp mode twice on my 25 mile trek from work to home. I had to not only turn off the car but remove the key from the ignition and re-insert it before I could start the car w/o the limp mode immediately kicking in. I got her home. I do have the spare throttle body but it looks like a couple of weeks out before I can get to it. Oh, P0121 code seemed to be the most relevant code recorded.

Now, do I drive my 77 Cadillac or 06 Solstice to work? Ah, gas is cheap, might drive the Caddy for a few days....