Torque Converter: Testing and Inspection
TORQUE CONVERTER CLUTCH TESTNOTE: This test should be performed on the road. If performed on the hoist the technician may not feel the torque converter clutch solenoid engage.
NOTE: The torque converter clutch solenoid is labeled "CCO" on the transmission tester overlay.
CAUTION: Do not depress torque converter clutch switch with transmission in gear and the vehicle at a stop. Damage to torque converter clutch may result.
NOTE: Engine coolant temperature must be above 128° and below 240° F. This temperature can be obtained after approximately 15 minutes of highway driving. Since most converter clutch shifts are difficult to feel, a tachometer and/or vacuum gauge must be connected to engine.
1. Accelerate vehicle to 88km/h (55 mph) and allow vehicle to upshift into third gear. Hold speed steady and depress the torque converter clutch switch. Does the torque converter (7902) engage? Does the engine rpm drop? Did the torque converter clutch solenoid activate/deactivate?