Diagnostic Procedure

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.

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.

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 ACCESSORIES & EQUIPMENT. 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.

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. Connect a test light from terminal "B" of the brake switch connector to ground. Does the test light illuminate? If yes, go to next step. If no, go to step 4.
Connect a fused jumper wire between terminal "A" and terminal "B" of the brake switch connector. Did the TCC Brake Switch status on the scan tool change from Open to Closed? If yes, go to step 7. If no, go to step 10.
Inspect the ENG IGN 1 fuse for an open. Is the fuse open? If yes, go to next step. If no, go to step 9.

NOTE: The condition that affects this circuit may exist in other connecting branches of the circuit. See WIRING DIAGRAMS .

Test the ignition 1 voltage circuit (CKT 339) of the brake switch for a short to ground. Did you find and correct the condition? If yes, go to step 12. If no, go to next step.
Test the TCC brake switch/cruise control release signal circuit (CKT 420) of the brake switch for a short to ground. Did you find and correct the condition? If yes, go to step 12. If no, go to step 11.
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 12. If no, go to next step.
Replace the brake switch. See ADJUSTMENTS in DISC - CORVETTE article in BRAKES. Did you complete the replacement? If yes, go to step 12.

NOTE: The condition that affects this circuit may exist in other connecting branches of the circuit. See WIRING DIAGRAMS .

Test the ignition 1 voltage circuit (CKT 339) of the brake switch for an open. Did you find and correct the condition? If yes, go to step 12.
Test the TCC brake switch/cruise control release signal circuit (CKT 420) of the brake switch for an open. Did you find and correct the condition? If yes, go to step 12. If no, go to next step.
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.
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 Closed, 12 volts, for 2 seconds.
- Select Specific DTC.
- Enter DTC P0719.
Has the test run and passed? If yes, go to next step. If no, go to step 2.
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.