Fail Safe caused by TPS?

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Fail Safe caused by TPS?

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Fail Safe caused by TPS? - 2/21/2008 10:37:26 PM

CarBizIndio

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Joined: 2/21/2008
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The 1999 Jag I have has no check engine light on. It will go in to fail safe mode if more then %75 throttle is applied. I think it is the TPS because I can trigger fail safe mode with the vehicle turned off and key on while I depress the throttle. My question is what is the most common link to the fail safe problem? And how often do the tps sensor's go bad and also is there a factory repair manual I can down load off the Internet for free?

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RE: Fail Safe caused by TPS? - 2/22/2008 10:44:40 AM

CarBizIndio

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Joined: 2/21/2008
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I checked TPS % with the engine off and key on and it seemed to be fluctuating from 2% up to 8% so I think I'll change the sensor and cross my fingers.

(in reply to CarBizIndio)

Post #: 2

RE: Fail Safe caused by TPS? - 2/22/2008 1:30:46 PM

FactoryJaguarTech

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Be careful as TPS is a calibrated part to your throttle body. Not normally serviced seperatly. Did you have codes? If fail safe engien mode is illuminated, it will give you a code.

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RE: Fail Safe caused by TPS? - 2/22/2008 3:20:01 PM

CarBizIndio

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Well I didn't want to hear about the calibration thing. I try to avoid the dealer as much as possible, can a snap on scanner calibrate the tps? I have no check engine light on so I didn't search for a code. Does the computer have to get flashed to calibrate the computer or is there a easy procedure?

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RE: Fail Safe caused by TPS? - 2/22/2008 4:41:00 PM

jag_genius

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you might need a throttle body.. i think snap on will get a code. but no description

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RE: Fail Safe caused by TPS? - 2/22/2008 4:41:40 PM

FactoryJaguarTech

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I dont mean a calibration via software. It is bolted to the throttle body in a set position.

Just because CEL is not on doesnt mean there will be no codes. If you have a snapon scan tool you may be able to read codes. Try and read them when failsafe engine mode is showing on the cluster. Do not turn key off, just read the codes. Let me know what they are.

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RE: Fail Safe caused by TPS? - 2/22/2008 4:50:16 PM

CarBizIndio

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Dealer said I cant get the tps by its self I have to get the whole throttle body. Looks like I'm going to send it to the dealer for a diagnosis before I spend the big bucks.

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Post #: 7

RE: Fail Safe caused by TPS? - 2/22/2008 4:51:34 PM

CarBizIndio

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Joined: 2/21/2008
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If I get a used throttle body is there any programing involved?

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Post #: 8

RE: Fail Safe caused by TPS? - 2/22/2008 5:01:42 PM

CarBizIndio

Posts: 40
Joined: 2/21/2008
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Codes
P0121

Pending
P0121
P1000
P1637

Sounds like a throttle body to me. What's your thoughts?

Thanks.