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Home >> Pontiac >> 1989 >> Firebird Base, 5.0 E, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 5.0L/5.7L PFI Tests W/Codes >> Diagnosis & Testing >> Code 15: Coolant Temp Sensor Signal Volt High >> Notes

Code 15: Coolant Temp Sensor Signal Volt High: Notes

Coolant temperature is one of the inputs used to control fuel delivery, spark timing, idle speed, converter clutch, canister purge, air management (manual transmission), EGR and cooling fan.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Code 15 will set if signal voltage indicates coolant temperature is low for 3 seconds.
  2. This test simulates a Code 14. If the ECM recognizes the low signal voltage and the "Scan" tester reads 130°C or more, ECM and wiring are okay.
  3. This test will determine if circuit No. 410 is open. There should be 5 volts present at sensor connector if measured with a DVOM.
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