LEMON Manuals: Even more car manuals for everyone
Home >> Pontiac >> 1990 >> Firebird Formula, 5.0 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - V8 PFI >> Code 15: Coolant Temp Sensor Signal Volt High >> Notes

Code 15: Coolant Temp Sensor Signal Volt High: Notes

Coolant temperature is one input the ECM uses to control fuel delivery, spark timing, idle speed, converter clutch, canister purge, air management (man. trans.), 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 determines if circuit No. 410 is open. There should be 5 volts present at sensor connector if measured with a digital volt-ohmmeter.
scientia non olet · About LEMON Manuals