Throttle body problems?
#1
#2
This looks to be the same fault mine had when I purchased my STR .
first check the throttle position sensor plug for water ingress
. and for corroded or bent pins .
Also charge your battery . And hard reboot the car . these cars are fussy about power supply .
if you find water in the TPS plug you will need to carry out the TSB patch and/or silicone the two vents/slots and wire gaskets on the TPS plug as I did . also de-oxidise / clean and coat the pins and plug sockets with electro grease or WD40 . 4.5 years later with mine and no further problems .
mine had the TSB patch fitted , but some idiot had refitted the windscreen cowl screw , in which the TSB says to not refit that screw . as water drops through the white plastic screw thread strait on to the TPS plug .
so i removed the thread also and taped up the strut brace also as a safe guard .
first check the throttle position sensor plug for water ingress
. and for corroded or bent pins .
Also charge your battery . And hard reboot the car . these cars are fussy about power supply .
if you find water in the TPS plug you will need to carry out the TSB patch and/or silicone the two vents/slots and wire gaskets on the TPS plug as I did . also de-oxidise / clean and coat the pins and plug sockets with electro grease or WD40 . 4.5 years later with mine and no further problems .
mine had the TSB patch fitted , but some idiot had refitted the windscreen cowl screw , in which the TSB says to not refit that screw . as water drops through the white plastic screw thread strait on to the TPS plug .
so i removed the thread also and taped up the strut brace also as a safe guard .
Last edited by Datsports; 08-31-2018 at 08:22 PM.
#5
Please define "good shape".
These cars, especially 2003+, are very finicky about battery condition. For the parking brake and DSC faults, please see this thread. It's a scorecard of what fixed them. The faults typically appear together:
https://www.jaguarforums.com/forum/s...attery-193787/
A little more history, too, please. Did the P0121, DSC, and park brake faults all appear together? Any recent work done? Has the car been driven regularly or has it sat for a while? What is your typical drive pattern, long or short trips? Your shoe size? Ginger or Maryanne?
These cars, especially 2003+, are very finicky about battery condition. For the parking brake and DSC faults, please see this thread. It's a scorecard of what fixed them. The faults typically appear together:
https://www.jaguarforums.com/forum/s...attery-193787/
A little more history, too, please. Did the P0121, DSC, and park brake faults all appear together? Any recent work done? Has the car been driven regularly or has it sat for a while? What is your typical drive pattern, long or short trips? Your shoe size? Ginger or Maryanne?
#6
#7
Trending Topics
#8
#9
#10
As JagV8 asked, have you put the battery on a charger? Sorry to keep beating a dead horse, but what exactly did you do to test the battery? We've had many examples on the forum of batteries that show good with most load testers, but still let the voltage drop below a critical level during start. The general rule is you want to see at least 12.6V present BEFORE start. Below that, things get wonky. DSC and cruise control faults are the most common problems. 12.6V is quite high for a battery at rest, well above what most testers will call good.
If hesitant to throw a battery at it, and I don't blame you, try this: Put an automatic charger on the battery, at least overnight. Use something with at least 10A output, NOT a trickle charger. Keep the charger connected while you start the car and see if the faults clear. If so, low battery voltage was the culprit.
#12
#13
Have you fully.charged the battery and left the charger connected during engine start? If the car now.behaves, low prestart voltage was the problem. Won't cost a cent to try. If you don't have a charger, we will wait while you get one. For any electrical troubleshooting, rule #1 is always begin with a fully charged battery. I can't stress strongly enough how important that is.
Also, have you checked yet for water at the TPS connector, as previously suggested? Search the forum for P0121 and you will see many hits about water at the plug.
#14
Dear Guys,
By way of an update, here goes:
Bought new battery, installed it, engine started first time and revved nicely when accelerator pedal pushed, all codes erased and dash warning lights went out bar an apply handbrake warning. New battery appears to have sorted out the major problems. THANK YOU VERY MUCH.
Does anyone know what’s going on with the apply handbrake light?
By way of an update, here goes:
Bought new battery, installed it, engine started first time and revved nicely when accelerator pedal pushed, all codes erased and dash warning lights went out bar an apply handbrake warning. New battery appears to have sorted out the major problems. THANK YOU VERY MUCH.
Does anyone know what’s going on with the apply handbrake light?
#15
#18
It's the threads that stay at the top of the forum all the time. These are considered our "All Time Greatest Hits".
Look there to get a free copy of the shop manual too! (Called the JTIS)
But it's a great feeling to find such a complete and pretty cheap repair!
This forum has saved me thousands of dollars and it's a fun hobby too!
.
.
.
Look there to get a free copy of the shop manual too! (Called the JTIS)
But it's a great feeling to find such a complete and pretty cheap repair!
This forum has saved me thousands of dollars and it's a fun hobby too!
.
.
.
#19
#20
Glad it all worked out well for you.
Can we please get more details of your battery tester, such as brand and model? Did it have options for testing the battery in or out of the vehicle? In other words, connected or disconnected. My hunch is the easier connected option has too many variables to be accurate.
Can we please get more details of your battery tester, such as brand and model? Did it have options for testing the battery in or out of the vehicle? In other words, connected or disconnected. My hunch is the easier connected option has too many variables to be accurate.