XJ6 ecu in my '96 xjs 4.0
#1
XJ6 ecu in my '96 xjs 4.0
I have been having the high/erratic idle problem for some time and decided to try swapping the ecu. A local friend had one from an old XJ6 so I plugged it in. Result, smooth idle and smooth running. The only issue has been a P1199 (Fuel Level Input Current Low) when the fuel level got down about 1/4 tank. I reset it with my el cheapo Elm327 and Dash Command on my iPad.
I think I've seen some posts that said you can't use an XJ6 ecu in an XJS.
So far I've seen a significant improvement and no ill effects. I don't consider the P1199 a big deal as I can reset it with DashCommand or a full tank of gas.
I think I've seen some posts that said you can't use an XJ6 ecu in an XJS.
So far I've seen a significant improvement and no ill effects. I don't consider the P1199 a big deal as I can reset it with DashCommand or a full tank of gas.
#2
P1199
In diagnosing a problem with my '95 XJS, I used an ECM from a '95 XJ6. It ran well but I too got a CEL and the code P1199 (low fuel). My XJS ECM has never commented on the fuel level signal/voltage and the electrical schematics do not show any relationship between the ECM and the fuel level sensor or anti-slosh module. Can anyone explain why this happens?
#3
I have been having the high/erratic idle problem for some time and decided to try swapping the ecu. A local friend had one from an XJ6 so I plugged it in. Result, smooth idle and smooth running. The only issue has been a P1199 (Fuel Level Input Current Low) when the fuel level got down about 1/4 tank. I reset it with my el cheapo Elm327 and Dash Command on my iPad.
I think I've seen some posts that said you can't use an XJ6 ecu in an XJS.
So far I've seen a significant improvement and no ill effects. I don't consider the P1199 a big deal as I can reset it with DashCommand or a full tank of gas.
I think I've seen some posts that said you can't use an XJ6 ecu in an XJS.
So far I've seen a significant improvement and no ill effects. I don't consider the P1199 a big deal as I can reset it with DashCommand or a full tank of gas.
#4
I'm guessing it's because the fuel tank sizes are different, so the sensor shows different resistant levels.
Here's the expected resistance levels for the XJS (from the 500+ page workshop manual):
All you gotta do is find the expected levels for the X300, and somehow change the resistance so that they match up.
I couldn't find the X300 workshop manual online. I got my XJS manual from JagDocs, The Source for Jaguar Documentation! . This might work for you, only costs about $10 for the PDF download: X300 Workshop Manual [Jaguar X300 XJ6 XJ12 XJR]
Padre
#5
Fool the sensor?
I'm guessing it's because the fuel tank sizes are different, so the sensor shows different resistant levels.
Here's the expected resistance levels for the XJS (from the 500+ page workshop manual):
All you gotta do is find the expected levels for the X300, and somehow change the resistance so that they match up.
I couldn't find the X300 workshop manual online. I got my XJS manual from JagDocs, The Source for Jaguar Documentation! . This might work for you, only costs about $10 for the PDF download: X300 Workshop Manual [Jaguar X300 XJ6 XJ12 XJR]
Padre
I'm guessing it's because the fuel tank sizes are different, so the sensor shows different resistant levels.
Here's the expected resistance levels for the XJS (from the 500+ page workshop manual):
All you gotta do is find the expected levels for the X300, and somehow change the resistance so that they match up.
I couldn't find the X300 workshop manual online. I got my XJS manual from JagDocs, The Source for Jaguar Documentation! . This might work for you, only costs about $10 for the PDF download: X300 Workshop Manual [Jaguar X300 XJ6 XJ12 XJR]
Padre
#6
I have been having the high/erratic idle problem for some time and decided to try swapping the ecu. A local friend had one from an old XJ6 so I plugged it in. Result, smooth idle and smooth running. The only issue has been a P1199 (Fuel Level Input Current Low) when the fuel level got down about 1/4 tank. I reset it with my el cheapo Elm327 and Dash Command on my iPad.
I think I've seen some posts that said you can't use an XJ6 ecu in an XJS.
So far I've seen a significant improvement and no ill effects. I don't consider the P1199 a big deal as I can reset it with DashCommand or a full tank of gas.
I think I've seen some posts that said you can't use an XJ6 ecu in an XJS.
So far I've seen a significant improvement and no ill effects. I don't consider the P1199 a big deal as I can reset it with DashCommand or a full tank of gas.
I wonder if you could just switch out the XJ6 fuel sensor to fool the ECU. Might not give 100% correct readings on the guage but if it shuts off the light would be worth it.
#7
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#8
#9
I think just swapping sensors would mess up the gas gauge. I want to change the feed to the ECU without changing the circuit to the gauge.
#10
Here are some discussions that may be helpful:
https://sites.google.com/site/shanno...our-fuel-gauge
how can I make a 90 ohm sender work with a 30 ohm fuel guage? | The H.A.M.B.
This interests me because I'm about to do a swap that may involve a lot of fiddling.
Padre
#11
#12
#13
More than likely a simple reset would fix the problem but a PDU is required and the dealer wants $150 to do it.
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