Urgent,help!Failsafe engine mode, traction ,ASC
#1
#3
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Location: Crossroads of America
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Vincent,
First of all, please tell us the year, model and engine of your Jaguar.
Secondly, as Jeff asks, do you know what diagnostic fault codes (DTCs) the shop found that prompted them to suggest a new battery and MAFS? Does the shop have a diagnostic system capable of reading proprietary Jaguar codes? I ask because standard OBDII scanners can only read the Powertrain (P-prefix) codes, but codes that can cause Traction Control and Automatic Stability Control to be disabled are often Chassis (C-prefix), Body (B-prefix) and Network (U-prefix) codes.
If you will post all the codes here and we'll do our best to help.
Cheers,
Don
First of all, please tell us the year, model and engine of your Jaguar.
Secondly, as Jeff asks, do you know what diagnostic fault codes (DTCs) the shop found that prompted them to suggest a new battery and MAFS? Does the shop have a diagnostic system capable of reading proprietary Jaguar codes? I ask because standard OBDII scanners can only read the Powertrain (P-prefix) codes, but codes that can cause Traction Control and Automatic Stability Control to be disabled are often Chassis (C-prefix), Body (B-prefix) and Network (U-prefix) codes.
If you will post all the codes here and we'll do our best to help.
Cheers,
Don
Last edited by Don B; 03-28-2018 at 08:36 PM.
#4
See page 101 :Blue wire 0.50 volts DC at idle going toward 5.0 on throttle up . The Green wire should read the same as a comparison as there are 2 TPSs on the same connector .
No need to run the engine just key on before start and twist the throttle for single person operation
http://www.jagrepair.com/images/Auto.../jagxj2000.pdf
The ABS and TC could be as simple as cleaning the face of the wheel sensors as the signal gets clouded over with debris
No need to run the engine just key on before start and twist the throttle for single person operation
http://www.jagrepair.com/images/Auto.../jagxj2000.pdf
The ABS and TC could be as simple as cleaning the face of the wheel sensors as the signal gets clouded over with debris
Last edited by Lady Penelope; 03-28-2018 at 09:12 PM.
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Don B (03-29-2018)
#5
Vincent,
First of all, please tell us the year, model and engine of your Jaguar.
Secondly, as Jeff asks, do you know what diagnostic fault codes (DTCs) the shop found that prompted them to suggest a new battery and MAFS? Does the shop have a diagnostic system capable of reading proprietary Jaguar codes? I ask because standard OBDII scanners can only read the Powertrain (P-prefix) codes, but codes that can cause Traction Control and Automatic Stability Control to be disabled are often Chassis (C-prefix), Body (B-prefix) and Network (U-prefix) codes.
If you will post all the codes here and we'll do our best to help.
Cheers,
Don
First of all, please tell us the year, model and engine of your Jaguar.
Secondly, as Jeff asks, do you know what diagnostic fault codes (DTCs) the shop found that prompted them to suggest a new battery and MAFS? Does the shop have a diagnostic system capable of reading proprietary Jaguar codes? I ask because standard OBDII scanners can only read the Powertrain (P-prefix) codes, but codes that can cause Traction Control and Automatic Stability Control to be disabled are often Chassis (C-prefix), Body (B-prefix) and Network (U-prefix) codes.
If you will post all the codes here and we'll do our best to help.
Cheers,
Don
#6
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Lady Penelope (03-29-2018)
#7
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Don B (04-05-2018)
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#8
Just for kicks, try turning on the ignition fully without starting the engine and then depress the accelerator through its full range 30 or 40 times.
Maybe there is a corrosion spot in the TPS?
See if doing that improves anything. If it doesn’t work at least it didn’t cost anything to try. If it does improve things then it points to your problem.
Maybe there is a corrosion spot in the TPS?
See if doing that improves anything. If it doesn’t work at least it didn’t cost anything to try. If it does improve things then it points to your problem.
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Don B (04-01-2018)
#9
Yep , Nailed it with that suggestion with the exception of effects of vibration and heat effects which is not accounted for , including in my suggestion .
You can read the codes for free at the auto parts store with the exception of the ABS / TC . Be sure to have them reset the codes to see it they reappear latter in the week .
You can read the codes for free at the auto parts store with the exception of the ABS / TC . Be sure to have them reset the codes to see it they reappear latter in the week .
Last edited by Lady Penelope; 03-29-2018 at 11:32 AM.
#10
Don't believe the MAF will give you Failsafe -- will give you the CEL. How is it running?
Do exercise the pedal to clean the sensor ... best to invest the $30 bucks for a simple code reader. It can sometimes take a few times to get all the codes cleared -- it's a strange OB system.
It could be a bad MAF ... hear of them failing. Have owned 100's of cars in the past 20 years -- have never had to replace one. I own a business with many vehicles.
I would install battery/ clear all codes and see what comes back first
Do exercise the pedal to clean the sensor ... best to invest the $30 bucks for a simple code reader. It can sometimes take a few times to get all the codes cleared -- it's a strange OB system.
It could be a bad MAF ... hear of them failing. Have owned 100's of cars in the past 20 years -- have never had to replace one. I own a business with many vehicles.
I would install battery/ clear all codes and see what comes back first
The following users liked this post:
Don B (04-01-2018)
#11
The following 2 users liked this post by vincent661983:
Don B (04-05-2018),
Lady Penelope (04-01-2018)
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