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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Engine Control System - 3.6L (Ly7) (DTC P0442 To DTC P167A)) >> Diagnosis >> DTC P0506 or P0507 >> Test Description

Test Description

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. 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

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 - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
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 - Vehicle in Vehicle DTC Information 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 or 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 - Vehicle in Vehicle DTC Information System OK
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