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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (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 2002 Buick Regal, 2002 Buick Century, 2001 Buick Regal, and 2001 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 the TCC. When the solenoid is commanded off, the PCM senses high voltage. When the solenoid is commanded on, the PCM senses low voltage.

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

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