code number 121 ap/tp sensor?

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Nov 8, 2005 | 05:18 PM

10secopcar

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From: Jones, OK

code number 121 ap/tp sensor?

we put a brand new delco tps on the car. cleared the code with snap on. but it only sets the code when at the track in staging lanes. dont understand y it only does it there or anywhere. i have a hard time believing a delco sensor is bad. but things do happen. any help is appreciated

Nov 8, 2005 | 06:50 PM

HumpinSS

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From: Waldorf, MD

what program are you using.

Nov 9, 2005 | 10:43 AM

10secopcar

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From: Jones, OK

LS1 edit and using the snap on to clear the code

Nov 9, 2005 | 12:05 PM

HumpinSS

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From: Waldorf, MD

under diagnostics is there a tps p0121 min and max map test. If so increase this value to 75 and 65

Nov 10, 2005 | 09:06 AM

10secopcar

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From: Jones, OK

so set the min to 75 and the max to 65 or switch them? so this is just a test parameter?

Nov 10, 2005 | 09:47 AM

HumpinSS

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From: Waldorf, MD

switch em and yes it is just a test parameter. Its the min and the max values the PCM uses to run the test TPS% vs engine rpm. With a cammed car they wont match anymore and you have to either desensitize the test (EFILive has tables for this) or change the test values (Edit and HPTuners)

Nov 11, 2005 | 11:58 AM

10secopcar

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From: Jones, OK

is it possible that having the cutout open is affecting this in some way? and when i change it seems how its just a test aprameter it wont affect anything else correct