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1991 Chevy Lumina 3.1 Getting 4 different codes

Tiny
PITO2169
  • MEMBER
  • 1991 CHEVROLET LUMINA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
Hi my friend has a chevy lumina with theses codes 15 coolant temp signal low/ 22, tps signal low / 43, esc module or sensor problem / 53, system voltage high/ replaced alternator checked all wiring connection replaced esc module but when I scan car it says 25.5 volts with those codes ched batteryu voltage it was within spec and alt was charging also good the car runs a little rough like if it had afouled plug or timing was a little off. Any help would be appreciated I cant sleep at night think and guessing whats wrong plus my buddy thinks the mech tech school I went was a waste of time cause I couldnt figure ths out. Thanks for time and patience guys
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Thursday, January 15th, 2009 AT 5:22 PM

4 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
If you can scan the car in live data, see what the TPS and coolant temp is reading.

TPS at closed throttle should be.60 to <1.0V and at WOT should be below 5V at about 4.6 or so V.

Coolant temp should be close to thermostat regulating temp or 195 degres.

If the ECM has faulted either sensor the default value will be WOT in the case of the TPS and -40 in the case of coolant temp. Sensor.

If you have replaced the TPS, you must disconnect battery so TPS voltage at closed throttle can be reset in the ECM. The TPS should gradually go up from.6V to 4.6V as the throttle is depressed.

Failure of either sensor will cause the car to run rich.
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Friday, January 16th, 2009 AT 5:33 AM
Tiny
PITO2169
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  • 5 POSTS
What about the 53 code and the over voltage problem my scanner still says 25.5 but alternator is in perfect working order and the code for esc spark control module or sensor problem. Thanks again for your time and patience
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Friday, January 16th, 2009 AT 3:21 PM
Tiny
PITO2169
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  • 5 POSTS
What about the 53 code and the over voltage problem my scanner still says 25.5 but alternator is in perfect working order and the code for esc spark control module or sensor problem. Thanks again for your time and patience
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Sunday, January 18th, 2009 AT 6:48 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Have charging system tested at most autoparts stores for free. If system voltage is 13.5-14-5 the the ECM is most likely bad or wiring to it or alternator.
Also see if the autoparts store can scan in live data and read the system voltage.

Code 53 is set when voltage at ECM terminal B2 is greater than 17.1 volts for 2 seconds.
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Saturday, January 31st, 2009 AT 10:04 AM

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