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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 636 (Engine Controls Diagnosis - 3.6L (Ly7) (DTC P0442 - DTC P167A)) >> Diagnostic Trouble Codes >> DTC P0506 or P0507 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  If any of the listed DTCs are present, correct the condition before returning to this table.
  2. 3:  This test determines whether the engine can achieve the commanded RPM, and if not, whether the engine speed is too high or too low.
DTC P0506 or P0507 - Idle Speed Low or High

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module (ECM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2  Are any throttle actuator control (TAC), throttle position (TP) sensor, or accelerator pedal position (APP) sensor DTCs set? - Go to Diagnostic Trouble Code (DTC) List Go to Step 3 
3 
  1. Start the engine.
  2. Command the engine speed up to 1,400 RPM, down to 600 RPM, up to 1,400 RPM, and then exit using the scan tool.
Is the actual engine speed within the specified value of the commanded engine speed, with each command?		 100 RPM Go to Step 4  Go to Step 5 
4
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 5  Go to Intermittent Conditions
5 Is the engine speed more than the specified value above the desired RPM? 100 RPM Go to Step 6  Go to Step 7 
6
  1. Inspect or test for the following conditions:
    • Inspect the engine for vacuum leaks.
    • Inspect the throttle valve for the correct operation. A throttle valve that does not close correctly, sets this DTC.
    • Inspect the crankcase ventilation system for the correct operation. Inspect for the following conditions:
      • Inspect that the correct positive crankcase ventilation (PCV) valve is used.
      • Inspect the routing of the PCV system.
      • Inspect for vacuum leaks in the PCV system.
  2. Repair the condition as necessary.
Did you complete the repair?		 - Go to Step 8  -
7
  1. Inspect for the following conditions:
    • Inspect for excess deposits in the throttle body.
    • Insect for a parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition
  2. Repair the condition as necessary.
Did you complete the repair?		 - Go to Step 8  -
8
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 9 
9 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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