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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Engine Control System Self-Diagnostics - 3.8L) >> Diagnostic Tests >> DTC P0506: Idle Control System - Low Rpm >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  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 more than 100 RPM more than or less than the Desired RPM? If yes, go to next step. If no, go to step  5.
  4. Inspect for the following conditions:
    • Excessive deposits in the throttle body
    • A faulty Positive Crankcase Ventilation (PCV) valve

    After repairs, go to step  6.

  5. Inspect for the following conditions:
    • Excessive deposits in the throttle body.
    • Energy draining load on the engine, such as drains caused by transmission conditions.

    After repairs, go to next step.

  6. Use the scan tool in order to clear the DTCs. Operate the vehicle within the Failure Record conditions. Does the DTC reset? If yes, go to step  2. If no, go to next step.
  7. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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