XJ40 ( XJ81 ) 1986 - 1994

XJ40 Transmission warning light

 
  #1  
Old 03-28-2019, 09:32 PM
Junior Member
Thread Starter
Join Date: Mar 2019
Location: Brisbane
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default XJ40 Transmission warning light

Hi,
I have had 4 beautiful Jags in my life and the latest is an XJR 100 from new but I have just been gifted the most immaculate XJ40 and the amber transmission light keeps coming on thus dropping the car into LHM. The transmission was rebuilt 6 months ago. The light will go out if left overnight and then reappears about 15-20 klm after start up. The designated fuse is ok.
Any ideas?
Rod Steley
 
  #2  
Old 03-29-2019, 06:04 AM
GGG's Avatar
GGG
GGG is online now
Join Date: Dec 2011
Location: Durham, UK
Posts: 109,133
Received 10,336 Likes on 8,494 Posts
Default

Originally Posted by rod Steley View Post
..... I have just been gifted the most immaculate XJ40 and the amber transmission light keeps coming on thus dropping the car into LHM. .....
Welcome to the forum Rod,

I've moved your question from XK8/XKR to XJ40 forum. Members here with the same model will be able to help.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham
 
  #3  
Old 03-29-2019, 08:43 AM
Join Date: Feb 2014
Location: The Beautiful Mid-South, U.S.A.
Posts: 16,692
Received 7,757 Likes on 4,332 Posts
Default

Originally Posted by rod Steley View Post
The transmission was rebuilt 6 months ago. The light will go out if left overnight and then reappears about 15-20 klm after start up. The designated fuse is ok.
Any ideas?
Hi Rod,

Welcome to the Jaguar Forums, and congratulations on your new immaculate XJ40! Please let us know the year and engine since these details can make a significant difference in the answers to your questions.

Since you have an amber transmission light, I'm going to assume you have a 4.0L model with the ZF 4HP24 electronically-controlled transmission. The most common cause of the transmission lamp and Limp Home Mode seems to be oil contamination on the electrical connector for the Throttle Position Sensor. The TPS is mounted on the underside of the Throttle Body, and its short harness connects to the main engine harness via a connector that is usually mounted on a bracket attached to the intake manifold elbow just to the left of the TB.

Disconnect the connector and flush the terminals in both halves with zero-residue electronic cleaner and allow them to dry or use compressed air. Reconnect and see if the problem is resolved. If not, you may need to remove the TB, pry the cover off of the TPS, or if it won't come off, drill small holes in two corners of the cover so you can insert the "straw" spray nozzle of the electronic cleaner can and flush all the accumulated oil and gunk out of the TPS.

If that still does not resolve your LHM, I'll offer more diagnostics once you let us know the year and engine of your car.

P.S. When you get a chance, how about posting some photos of the car so the rest of us can drool over them!

Cheers,

Don
 

Last edited by Don B; 03-29-2019 at 08:23 PM.
The following 2 users liked this post by Don B:
Lawrence (03-29-2019), MountainMan (04-04-2019)
  #4  
Old 03-29-2019, 10:33 AM
Senior Member
Join Date: Aug 2012
Location: LA
Posts: 580
Likes: 0
Received 143 Likes on 105 Posts
Default

Originally Posted by Don B View Post
Hi Rod,

Welcome to the Jaguar Forums, and congratulations on your new immaculate XJ40! Please let us know the year and engine since these details can make a significant difference in the answers to your questions.

Since you have an amber transmission light, I'm going to assume you have a 4.0L model with the ZF 4HP24 electronically-controlled transmission. The most common cause of the transmission lamp and Limp Home Mode is oil contamination on the electrical connector for the Throttle Position Sensor. The TPS is mounted on the underside of the Throttle Body, and its short harness connects to the main engine bay harness via a connector that is usually mounted on a bracket attached to the intake manifold elbow just to the left of the TB.

Disconnect the connector and flush the terminals in both halves with zero-residue electronic cleaner and allow them to dry or use compressed air. Reconnect and see if the problem is resolved. If not, you may need to remove the TB, pry the cover off of the TPS, or if it won't come off, drill small holes in two corners of the cover so you can insert the "straw" spray nozzle of the electronic cleaner can and flush all the accumulated oil and gunk out of the TPS.

If that still does not resolve your LHM, I'll offer more diagnostics once you let us know the year and engine of your car.

Cheers,

Don
yep. Once cleaned and reset, let us know if it happens again. We can then move on to the next step
 
  #5  
Old 05-08-2019, 06:05 AM
Member
Join Date: Dec 2012
Location: San Antonio Tx USA
Posts: 89
Received 7 Likes on 6 Posts
Default

I had this same issue on a 93 XJ6 with 80k miles on it. Cleaning the Throttle Position Sensor resolved the issue.
 
The following users liked this post:
Lawrence (05-08-2019)
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mhannaoui
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
11
03-04-2019 09:11 PM
paulysold
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
13
02-18-2019 03:40 PM
beulahjag
S-Type / S type R Supercharged V8 ( X200 )
0
02-04-2019 12:10 PM
Andi2610
XF and XFR ( X250 )
3
02-01-2019 06:23 PM
Clive Harris
XK / XKR ( X150 )
5
02-01-2019 07:23 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: XJ40 Transmission warning light


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: