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.

1985 Chevrolet Forward Control 6.2 J, StandardFACTORY OEM SERVICE PROCEDURE

Code 14 - Coolant Sensor Shorted

Code 14 means the ECM has seen low resistance of the coolant sensor circuit as high engine temperature, or low voltage at ECM term. "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.
NOTE: Coolant sensor IS NOT connected during this test.
Checks for ground between ECM and coolant sensor. Test light to battery positive will be "OFF" in an ungrounded circuit.

Fig 1: Code 14, Coolant Sensor Shorted

Factory Service Tools

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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.