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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 666 (Cruise Control System) >> Diagnostic Information & Procedures >> DTC P0568: Set/Coast Switch ON For Longer Than 90 Seconds >> Circuit Description

Circuit Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The cruise control Set/Coast switch is an input to the Throttle Actuator Control (TAC) module. The cruise control information is supplied to the PCM via serial data. This input allows the PCM and TAC module to control and hold a requested speed. The cruise control Set/Coast switch sends a ignition positive voltage signal to the TAC module when the momentary switch is applied. This DTC sets if the TAC module senses a voltage on the Set/Coast switch signal circuit when the voltage is not expected.

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