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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 220 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P1860: TCC Pulse Width Modulated Solenoid Electrical Problem >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Ignition voltage is provided to the Torque Converter Clutch Pulse Width Modulation (TCC PWM) solenoid valve. The PCM controls the solenoid with a negative duty cycle to control application and release of TCC. When the solenoid is commanded OFF, PCM senses high voltage. When the solenoid is commanded ON, PCM senses low voltage.

DTC P1860 sets if PCM detects a voltage that is outside of calibration limits. DTC P1860 is a type "B" DTC.

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