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Home >> Pontiac >> 1988 >> Firebird Base, 5.0 E, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 1987-88 Computerized Engine Controls >> Chart C8A - 200-4R Torque Converter Clutch Diagnosis >> 200-4R Torque Converter Clutch (TCC) Diagnosis (2 Of 2) >> Diagnostic Aids

Diagnostic Aids

A road test may be necessary to verify customer complaint. If the "SCAN" tester indicates TCC is turning "ON" and "OFF" erratically, check the state of the 4th gear switch to be sure it is not changing states under a steady throttle position. If the switch is changing, check connections and wire routing carefully. Also if 4th gear switch is always open, the TCC may engage as soon as sufficient oil pressure is reached.

Fig 1: Flow Chart C8A (2 of 2), TCC Electrical Diagnosis
G7129
NOTE: Checks made in this chart will not prevent the TCC from working, but will affect engagement or disengagement points.
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