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DTC P1574 Circuit Description This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused DTC Descriptor This diagnostic procedure supports the following DTC: DTC P1574 Stop Lamp Switch Circuit Conditions for Running the DTC DTCs P0502, P0503, P0719 and P0724 are not set. The engine speed is greater than 700 RPM. The Traction Control System (TCS) or the Antilock Brake System (ABS) are not active and The vehicle speed is greater than 48 km/h (30 mph) in order to enable the diagnostic. The diagnostic will disable when the wheel speed is less than 16 km/h (10 mph). Conditions for Setting the DTC The vehicle speed decreases by at least 4.2 km/h (2.6 mph) within 0.25 seconds. The PCM detects a TCC brake/cruise release switch transition. The PCM does not detect a stop lamp switch transition. Action Taken When the DTC Sets The PCM sets the stop lamp switch status to released. The PCM disables the operation of the Cruise Control System. Conditions for Clearing the DTC A history DTC will clear after 40 malfunction free warm-up cycles, if failures are not Does the DTC reset? Go to Step 2 System OK
2007 Hummer H3 2007 ACCESSORIES & EQUIPMENT Cruise Control - H3
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