Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2003 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0724: Brake Switch Circuit - High Input >> Diagnostic Procedure

Diagnostic Procedure

  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
    2. WARNING: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. See appropriate AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.
    NOTE: Before clearing the DTC, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the PCM.
  2. Install a scan tool. Turn ignition ON, with engine OFF. Record the DTC Failure Records. Clear the DTC. Select TCC Brake Switch on the scan tool. Disconnect the brake switch connector from the brake switch. Did the TCC Brake Switch status on the scan tool change from Closed to Open? If yes, go to next step. If no, go to step  5.
  3. Inspect the brake switch for proper adjustment. Adjust the brake switch as necessary. See ADJUSTMENTS in DISC - CORVETTE article in BRAKES. Did the brake switch require adjustment? If yes, go to step  7. If no, go to next step.
  4. Replace brake switch. See ADJUSTMENTS in DISC - CORVETTE article in BRAKES. Did you complete the replacement? If yes, go to step  7.
  5. Test the brake switch signal circuit (CKT 420) for a short to power. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  6. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - CORVETTE article. Did you complete the replacement? If yes, go to next step.
  7. Perform the following procedure in order to verify the repair:
    • Select DTC.
    • Select Clear Info.
    • Turn ignition ON, with engine OFF.
    • Apply and release the brake pedal.
    • Verify that the scan tool TCC Brake Switch status indicates Open, 0 volts, for 2 seconds.
    • Select Specific DTC.
    • Enter DTC P0724.

    Has the test run and passed? If yes, go to next step. If no, go to step  2.

  8. With the scan tool, observe the stored information, capture info, and DTC Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
scientia non olet · About Mike's Workshop Manuals