Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1987FIREBIRD FORMULA, 5.0 H, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM5.0L FEEDBACK CARBURETOR TESTS W/CODESCODE 14 - COOLANT SENSOR SHORTED
1987 Pontiac Firebird Formula, 5.0 H, Automatic
Code 14 - Coolant Sensor Shorted
1987 Pontiac Firebird Formula, 5.0 H, AutomaticSECTION Code 14 - Coolant Sensor Shorted
Code 14 indicates the ECM has seen low resistance of the coolant sensor circuit as high engine temperature, or low voltage at ECM terminal "3", for a time longer than specified.
NOTE:
The following step numbers refer to the numbers in the accompanying flow chart(s).
- This test determines whether fault is in sensor or circuit. Normal circuit voltage is about 5 volts or Scanner should read very low (-10°C). A low voltage or high coolant temperature would indicate a faulty circuit or ECM.
- This test checks for grounded circuit between ECM and coolant sensor. Test light to battery positive will be off in an ungrounded circuit. Coolant sensor is not connected during the test.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.