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Home >> Chevrolet >> 2003 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0506 Or P0507: Idle Control System >> Diagnostic Procedures

Diagnostic Procedures

  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. Start the engine. With a scan tool, command the engine speed up to 1500 RPM, down to 500 RPM, and up to 1500 RPM. Exit the RPM control function. Does the engine speed correspond, within 100 RPM, with each command? If yes, see DIAGNOSTIC AIDS . If no, go to next step.
  3. Is the engine RPM 100 RPM greater than the desired RPM? If yes, go to next step. If no, go to step  5.
  4. Inspect for vacuum leaks, excessive deposits in the throttle body, or a faulty PCV valve. Did you complete the repair? If yes, go to step  6.
  5. Inspect for energy draining load on the engine, such as ones caused by transmission conditions. Did you complete the repair? If yes, go to next step.
  6. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  7. Observe the stored information and Capture Info. with a scan tool. Does the scan tool indicated any DTCs set that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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