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Wiring diagrams Section: Testing & Diagnostics

Engine Controls - 3.5L - Introduction (1 of 2)

Engine Controls - 3.9L - Introduction (1 of 2)

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P0506 Chevrolet Uplander I

Testing & Diagnostics

The ECM detects that the actual idle speed is approximately 150 RPM lower than the desired idle speed continuously.
The above condition is present for 3 tests consisting of 8 seconds each test.