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Home >> Buick >> 2008 >> Lucerne Super >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L - DTC P0340 To DTC P2138 >> DTC P0506 or P0507 >> Circuit/System Verification

Circuit/System Verification

  1. Verify that no other DTCs set.
  2. Compare the desired engine idle speed to the actual engine idle speed with a scan tool. Actual engine idle speed should be no greater than or less than 100 RPM of desired.
  3. Command the engine speed up and down with a scan tool. Increase the engine speed in 25 RPM increments while comparing the desired engine speed to the actual engine speed, the actual engine speed should stay within 25 RPM of the desired engine speed.
  4. Engine running, observe the DTC information with a scan tool. DTCs P0506 or P0507 should not set.
  5. 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 data.
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