Late model 2003 XJ8 Error codes P1121 and P1122
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Don B (09-26-2015)
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Hi RSpi,
I don't have the 2003 XJ DTC Summaries manual, but in case it's helpful, here's what the 2001 manual has to say about possible causes of P1121 and P1122:
The schematics show the PPS is grounded through the ECM, so in addition to RJ's recommendation to clean the TB connectors, it might be worth also cleaning the EMS bulkhead ground stud and wire terminals.
Cheers,
Don
I don't have the 2003 XJ DTC Summaries manual, but in case it's helpful, here's what the 2001 manual has to say about possible causes of P1121 and P1122:
The schematics show the PPS is grounded through the ECM, so in addition to RJ's recommendation to clean the TB connectors, it might be worth also cleaning the EMS bulkhead ground stud and wire terminals.
Cheers,
Don
Last edited by Don B; 09-26-2015 at 09:44 PM.
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I made the same assumption until I looked at the schematic. On the X308, the PPS is built into the TB assembly (along with the TPS), and it determines pedal position via the accelerator cable.
Cheers,
Don
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Well, we could still be using carburetors if not for the emission standards, I suppose
http://api.viglink.com/api/click?for...ansmission.pdf
Have a look starting at page 27.
It is important to note that this write up is for the AJ26 engine. The AJ27 is a true drive by wire and does NOT have the mechanical guard. I suppose Jaguar would say they have not made parts available due to the sensitive nature of the throttle control. And... you don't hear claims of "sudden acceleration" for these cars much, so they must have something right.
http://api.viglink.com/api/click?for...ansmission.pdf
Have a look starting at page 27.
It is important to note that this write up is for the AJ26 engine. The AJ27 is a true drive by wire and does NOT have the mechanical guard. I suppose Jaguar would say they have not made parts available due to the sensitive nature of the throttle control. And... you don't hear claims of "sudden acceleration" for these cars much, so they must have something right.
Last edited by sparkenzap; 09-28-2015 at 02:41 AM.
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Don B (09-29-2015)
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I could use some pictures and/or video showing how to clean the TPS connector(s). Today on the interstate I got the Failsafe Engine Mode twice, both times occurring when I had to cancel cruise control for traffic. Related to cruise control? Both times I was able to pull over and restart car with no issues. Both times the RPMs seemed to be locked in the 2000 range, uncontrollable with the pedal. The first time no CEL displayed, but after the second time CEL was lit. Once I got home (200 miles later) I was able to pull P1122, and that was the sole code.
When I do get the connectors off, is it safe to use MAF cleaner, or do I need contact cleaner specifically?
When I do get the connectors off, is it safe to use MAF cleaner, or do I need contact cleaner specifically?
Last edited by Presence; 03-20-2016 at 08:39 PM.
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