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1986 Pontiac Fiero TEMP GAUGE

Tiny
SEASIDESEAHORSE
  • MEMBER
  • 1986 PONTIAC FIERO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 116,000 MILES
I have a problem with the Temp Sensor. I have replaced the temp sender but the tempature guage immediately goes past the red. The engine is not hot and the Temp light does not come on. I get a code 15
when checking the codes. The fan DOES go on when I turn on the A/C. Help!
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Wednesday, August 18th, 2010 AT 7:26 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
How about about the coolant temperature sensor also did you test the wires?
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Wednesday, August 18th, 2010 AT 8:11 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS


https://www.2carpros.com/forum/automotive_pictures/416332_1986_pontiac_fiero_code_15_part1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1986_pontiac_fiero_code_15_part2_1.jpg


Code 15 is for high signal voltage in the coolant temp sensor circuit.You most likely have a open from the sensor to the ecm.I posted a wire diagram and what the cause for that code is.Let me know what you find.
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Wednesday, August 18th, 2010 AT 8:15 PM

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