LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 81 (Engine Controls - Self-Diagnostics - 4.8L, 5.3L & 6.0L) >> Diagnostic Tests >> DTC P0506: Idle Control System - Low Rpm (With Electronic Throttle Control) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, and 2002 Chevrolet Tahoe. 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. Set the park brake, and block the drive wheels. Start the engine. Turn OFF all accessories. With the RPM control function of the scan tool, command the engine RPM to 1500 RPM, to 500 RPM, and back to 1500 RPM. Exit the RPM Control function. Did the engine speed stay within 100 RPM of the commanded RPM during the above test? If yes, go to next step. If no, go to step  4.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. In order to operate the vehicle under the conditions which set the DTC, use the following information:
    • The data in the Freeze Frame/Failure Records.
    • The parameters listed in the Conditions for Running in the DTC.

    Does the DTC set? If yes, go to next step . If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.

  4. Inspect for the following conditions:
    • Deposits in the throttle body.
    • Objects which are blocking the air intake system.
    • Energy-draining load on the engine, such as transmission conditions.

    Repair as necessary. After repairs, go to next step.

  5. 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 DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  6. 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.
scientia non olet · About LEMON Manuals