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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1206 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P1574: Decrease In Non-Drive Wheel Speed, Or TCC Brake Switch Indicating Brakes With No Transition Of Stop Lamp Switch >> Circuit Description

Circuit Description

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

This diagnostic test functions on the assumption that sudden decrease in a non-drive, wheel speed must be caused by a brake application. Non-drive wheel speed and stop lamp switch status are supplied to the PCM through serial data from the Electronic Brake Control Module (EBCM). If there is a 4 km/h (2.5 mph) greater decrease of non-drive wheel speed in 0.4 seconds and a transition of the TCC or extended travel contacts of the TCC brake switch without a transition of the stop lamp brake switch, DTC P1574 is set.

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