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Chart C8 - Torque Converter Clutch: Notes

The purpose of automatic transmission/transaxle Torque Converter Clutch (TCC) feature is to eliminate power loss of torque converter stage when vehicle is in cruise condition. Fused battery ignition is supplied to TCC solenoid through brake switch, and transmission 3rd gear apply switch. The ECM will engage TCC by grounding circuit No. 422 to energize solenoid. TCC will engage when vehicle speed is greater than 30 MPH, engine at normal operating temperatures greater than 158°F (70°C), throttle position sensor output not changing (indicating a steady road speed), transmission 3rd gear switch closed, and brake switch closed.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Light off confirms that the transmission 3rd gear apply switch is open.
  2. At 30 MPH transmission/transaxle 3rd gear switch should close. Test light will come on and confirm battery supply and closed brake switch.
  3. Grounding ALDL "test" terminal with engine off should energize the TCC solenoid. This test checks capability of ECM to control solenoid.
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