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Home >> Chevrolet >> 2004 >> Impala LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 545 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0571 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Sky. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Fix any Brake System related DTCs or symptoms before using this diagnostic.
  1. Ignition ON, perform the brake pedal position (BPP) sensor calibration procedure and verify the BPP is calibrated properly. Refer to Brake Pedal Position Sensor Calibration .
    • If the BPP will not calibrate properly, replace the BPP.
  2. Ignition ON, observe the BPP Circuit Signal parameter in the ECM while depressing the brake pedal.
    • If the parameter reads Applied, test the stop lamp switch signal circuit for an open/high resistance, a short to ground or a short to voltage. If the circuit tests normal, replace the ECM.
    • If the parameter reads Released, refer to Stop Lamps Malfunction .
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