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 MANUALSPONTIAC1994FIREBIRD TRANS AM GT, 2D COUPEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 5.7LECM/PCM CODE CHARTSCODE 67, A/C PRESSURE SENSORNOTES
1994 Pontiac Firebird Trans Am GT, 2D Coupe
Code 67, A/C Pressure Sensor: Notes
1994 Pontiac Firebird Trans Am GT, 2D CoupeSECTION Notes
PCM determines when A/C clutch is engaged by monitoring A/C status line. If A/C pressure does not increase by at least 4 psi when A/C clutch is turned on, Code 67 will set.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Code 67 will set if PCM does not detect a A/C pressure change when A/C clutch has been cycled.
- If relay power feed is intermittent, A/C clutch status terminal may not detect voltage when A/C is commanded on.
- Check A/M electrical harness for problems. If A/C clutch status line becomes intermittently open or shorted while compressor is on, PCM will be wrongly detecting A/C clutch going on and off. When this occurs and clutch remains engaged, PCM will not detect pressure change and a Code 67 will be set.
- If A/C compressor clutch status circuit is intermittently open or shorted while compressor is on, PCM will wrongly detect compressor cycling on and off, but PCM will detect no pressure change and a Code 67 will set.
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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.