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 MANUALSPONTIAC19846000 STEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGR SYSTEM - V6 DIESEL (CALIF)SYSTEM TESTINGTCC CHECK - 200-R4 TRANSMISSION
1984 Pontiac 6000 STE
TCC Check - 200-R4 Transmission
1984 Pontiac 6000 STESECTION TCC Check - 200-R4 Transmission
ECM output to the transmission for TCC engagement occurs when: VSS signal is more than a given speed, MVS signal is more than a given throttle opening and governor switch is closed.
- This test checks for 12 volts at transmission TCC connector. Test light should not be "ON." If the light was "ON," there is either a short to 12 volts or a faulty ECM.
- This test checks for TCC engagement signal to transmission. Light should be "ON" above TCC engagement speed.
- This test checks for TCC engagement signal at ECM. Results will indicate an open or faulty ECM. If light flashes, ECM is trying to engage TCC but is shorted in wire or solenoid. The ECM has a short protection circuit that will protect TCC engage signal by cutting TCC signal "OFF" when short is detected.
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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.