2001 XJR Sporadic Shifting Funny Business
#1
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Hey All,
Got a funny issue with my '01 XJR with 82k on it that comes and goes, seemingly at will. I've researched some of the more common issues for the transmission and I can't make heads or tails of the issues that I'm seeing. I'm curious if it's something totally unrelated that this is an odd side effect.
Has anyone had similar symptoms? If so, I'd appreciate your feedback!
Got a funny issue with my '01 XJR with 82k on it that comes and goes, seemingly at will. I've researched some of the more common issues for the transmission and I can't make heads or tails of the issues that I'm seeing. I'm curious if it's something totally unrelated that this is an odd side effect.
- A couple months ago I'd felt a weird 1-2 shift where it surged a few times coming into the shift point. 2-3 was a bigger surge, maybe a couple hundred RPM, though enough to make it obvious. Going around a corner later that day, it felt like a torque converter clutch not engaging properly and the 'transmission fault' light came on. Pull into a parking lot, turn it off and on again, and voila - problem gone. I've had the same torque converter feeling come up two other times in the last couple months.
- I was getting on the expressway a couple weeks ago and punched it coming out of the corner onto the entrance ramp - the nothing happened. It seemed like the transmission was completely disengaged from any gear. Pull over, shut it off and turn it on again and it resumed like nothing happened.
- Then there was the one time about a month ago when I was pulling into a parking space - I went to put it in reverse (as I back in all the time) and it seemed as if the shifter cable was not even connected - it wouldn't engage reverse, then wouldn't engage any forward gear. Shut it off, turn it on, and again it resumed like nothing had happened.
Has anyone had similar symptoms? If so, I'd appreciate your feedback!
#2
#3
#5
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New batteries are junk these days
13.5 volts with a running alternator is the lower limit , the standard place to measure is the B + post on the alternator as there are variables on the way to the battery post
You have 2 throttle position sensors on the V8
one for the engine ECU and one for the transmission ECU
Both ECU's must coordinate with each other
There have been history of fluids leaking into the on the transmission body connector from above
There are 2 sensitive transmission input and output speed sensor wire paths through it to the transmission ECU
13.5 volts with a running alternator is the lower limit , the standard place to measure is the B + post on the alternator as there are variables on the way to the battery post
You have 2 throttle position sensors on the V8
one for the engine ECU and one for the transmission ECU
Both ECU's must coordinate with each other
There have been history of fluids leaking into the on the transmission body connector from above
There are 2 sensitive transmission input and output speed sensor wire paths through it to the transmission ECU
Last edited by Parker 2; 04-15-2021 at 12:14 AM.
#6
![Default](/forum/images/icons/icon1.gif)
Hey All,
Got a funny issue with my '01 XJR with 82k on it that comes and goes, seemingly at will. I've researched some of the more common issues for the transmission and I can't make heads or tails of the issues that I'm seeing. I'm curious if it's something totally unrelated that this is an odd side effect.
Has anyone had similar symptoms? If so, I'd appreciate your feedback!
Got a funny issue with my '01 XJR with 82k on it that comes and goes, seemingly at will. I've researched some of the more common issues for the transmission and I can't make heads or tails of the issues that I'm seeing. I'm curious if it's something totally unrelated that this is an odd side effect.
- A couple months ago I'd felt a weird 1-2 shift where it surged a few times coming into the shift point. 2-3 was a bigger surge, maybe a couple hundred RPM, though enough to make it obvious. Going around a corner later that day, it felt like a torque converter clutch not engaging properly and the 'transmission fault' light came on. Pull into a parking lot, turn it off and on again, and voila - problem gone. I've had the same torque converter feeling come up two other times in the last couple months.
- I was getting on the expressway a couple weeks ago and punched it coming out of the corner onto the entrance ramp - the nothing happened. It seemed like the transmission was completely disengaged from any gear. Pull over, shut it off and turn it on again and it resumed like nothing happened.
- Then there was the one time about a month ago when I was pulling into a parking space - I went to put it in reverse (as I back in all the time) and it seemed as if the shifter cable was not even connected - it wouldn't engage reverse, then wouldn't engage any forward gear. Shut it off, turn it on, and again it resumed like nothing had happened.
Has anyone had similar symptoms? If so, I'd appreciate your feedback!
#7
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@Parker 2 - Interesting that you mention two TPS sensors, definitely something worth checking out. If I pop off the connectors, should the resistance be the same for both sensors?
@xalty @Parker 2 - You both might be onto something with the connector - I'll have to check into how to access it to verify.
@brian2891 - Was your transmission physically leaking that you could see? The only thing that I've seen leak on this car was some seal on the engine when it gets cold out (I'd seen the same exact thing on my '03 under similar conditions and wasn't concerned about it).
@xalty @Parker 2 - You both might be onto something with the connector - I'll have to check into how to access it to verify.
@brian2891 - Was your transmission physically leaking that you could see? The only thing that I've seen leak on this car was some seal on the engine when it gets cold out (I'd seen the same exact thing on my '03 under similar conditions and wasn't concerned about it).
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#8
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See page 59 lower right corner for TPS 1 and TPS 2
http://www.jagrepair.com/images/Auto.../jagxj2001.pdf![Icon Dance Disco](https://www.jaguarforums.com/forum/images/smilies/icon_dance-disco.gif)
The 2 TPS sensors will be close but not exact as you very slowly open the throttle butterfly
You should not see a spike to zero volts
The output signal should be 0.50 volts dc at the idle stop on wire brown and wire green ( the middle 2 wires on the connector that has to remain connected )
You can do this test with the engine not running but the key in the run position
http://www.jagrepair.com/images/Auto.../jagxj2001.pdf
![Icon Dance Disco](https://www.jaguarforums.com/forum/images/smilies/icon_dance-disco.gif)
The 2 TPS sensors will be close but not exact as you very slowly open the throttle butterfly
You should not see a spike to zero volts
The output signal should be 0.50 volts dc at the idle stop on wire brown and wire green ( the middle 2 wires on the connector that has to remain connected )
You can do this test with the engine not running but the key in the run position
Last edited by Parker 2; 04-16-2021 at 02:43 PM.
#9
#10
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@brian2891 - Was your transmission physically leaking that you could see? The only thing that I've seen leak on this car was some seal on the engine when it gets cold out (I'd seen the same exact thing on my '03 under similar conditions and wasn't concerned about it).[/QUOTE]
No, I didn't see the leak and never found any indication of a leak on my garage floor, so I was very surprised to find that the transmission fluid was very low!
No, I didn't see the leak and never found any indication of a leak on my garage floor, so I was very surprised to find that the transmission fluid was very low!
#12
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Appreciate everyone's feedback here! I'd ended up picking up one of the dipsticks from eBay (turned out to be a piece of trash - rubber end that curled around when it hit the pan), marked the hash marks on a piece of solid core copper wire, saw that I was a bit low on fluid. Quick trip over to the local Merc dealer and they had me squared away for around $160 out the door for the fluid, filter, seal, connector and locking pin. I usually source parts from Terry's Jag as they're reasonable and have great service, but $115 for the filter, seal and pin was too much. The car is shifting perfectly again and very happy I took the time to do the trans job.
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