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Engine Controls - System/component Tests - 7.4L: Specifications GMC C3500 HD

Testing & Diagnostics 1 illustration

Torque Converter Clutch (TCC) Solenoid

See MISCELLANEOUS ECM/PCM/VCM CONTROLS .

Disconnect harness connector to TCC solenoid. Measure resistance between TCC solenoid terminals. (Scheme 130) Solenoid resistance should be greater than 20 ohms.

Scheme 130

Scheme 130: Torque Converter Clutch (TCC) Solenoid

Scheme 130: Torque Converter Clutch (TCC) Solenoid

Note. Some solenoids have an internal pressure switch in series with solenoid winding and will not show continuity until transmission hydraulic pressure is applied.