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Diagnostic Procedure

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  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to DLC. Turn ignition on, engine off. Using scan tool, record freeze frame and failure records for reference, and then clear DTCs. Using scan tool, monitor brake switch parameter. Disconnect brake switch harness connector. If status on scan tool changes from CLOSED to OPEN, go to next step. If scan tool status does not change, go to step  4.
  3. Replace brake switch. See appropriate SHIFT INTERLOCK SYSTEMS article. After repairs, go to step  6.
  4. Check brake switch input circuit for short to voltage. Repair as necessary. After repairs, go to step  6. If circuit is okay, go to next step.
  5. Replace PCM. After replacement, program PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, go to next step.
  6. Using scan tool, clear DTCs. Turn ignition on, engine off. Apply and release brake pedal. Ensure TCC brake switch signal indicates zero volts for 2 seconds. Check for DTCs. If DTC P0724 does not return, system is okay. If DTC P0724 returns, repeat step  1.
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