Pontiac Fiero 1984-1988 Repair Guide

Automatic Transmission Converter Clutch (TCC) System

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OPERATION





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Fig. Fig. 1 Transaxle Converter Clutch (TCC) solenoid components

The transmission converter clutch system is designed to eliminate power loss by the torque converter slippage. This system increases fuel efficiency because a more effective coupling to the flywheel is achieved. The converter clutch is operated by an ECM controlled solenoid within the automatic transaxle. The solenoid will not engage until the proper amount of fluid pressure is achieved.

INSPECTION



  1. Install a tachometer.
  2.  
  3. Operate the vehicle until proper operating temperature.
  4.  
  5. Drive the vehicle at 50-55 mph (80-88 km/h) with light throttle.
  6.  
  7. Lightly touch the brake pedal and check for a slight bump when the TCC releases a slight increase in the engine RPM.
  8.  
  9. Release the brake and check for a re-apply of the converter clutch and a slight decrease in engine RPM.
  10.  


WARNING
Do not apply 12-volts of battery current to test the TCC solenoid. Accidentally crossed wires will destroy the internal diodes of the TCC solenoid.

REMOVAL & INSTALLATION





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Fig. Fig. 2 The valve body side cover must be removed to gain access to the TCC solenoid



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Fig. Fig. 3 The oxygen sensor is located in the exhaust cross-over pipe on 2.8L V6 engines

  1. Raise the vehicle and support with jackstands.
  2.  
  3. Disconnect the negative (-) battery cable.
  4.  
  5. Drain the transaxle fluid into a suitable drain pan. Refer to the "Transaxle Fluid Change" procedures in .
  6.  
  7. Remove the valve body side cover and drain excess fluid into the drain pan.
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  9. Disconnect the solenoid wires from the electrical connector and the pressure switch.
  10.  
  11. Remove the one solenoid attaching screw and pull the TCC solenoid out of the valve body.
  12.  

To install:

  1. Position a new O-ring seal onto the TCC solenoid. Lubricate the O-ring with Dexron®II and install the solenoid into the valve body. Tighten the one attaching screw and reconnect the electrical wires.
  2.  
  3. Install the valve body side cover with a new gasket and torque the bolts to 8 ft. lbs. (11 Nm).
  4.  
  5. Refill the transaxle with the proper amount of Dexron®II. Refer to the "Transaxle Fluid Change" procedures in .
  6.  
  7. Connect the negative (-) battery cable. Start the engine and wait till operating temperature has been reached. With the emergency brake applied, move the gear selector through the gears. Put the selector in PARK, check the fluid level and fill to proper level with engine running.
  8.  

 
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