LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2009 >> CTS V, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> DTC P0571 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connectors at the appropriate control modules listed below.
    • ECM X2
    • TCM
  2. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    • ECM terminal 52
    • TCM terminal 6
  3. Ignition ON, verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, connect the harness connector at the TCM.
  5. Connect a test lamp between the ECM signal circuit terminal 52 and ground.
  6. Ignition ON, verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the TCM.
  7. If all circuits test normal, replace the ECM.
scientia non olet · About LEMON Manuals