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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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P0171 Chevrolet Uplander I

Testing & Diagnostics

The average long term FT value is equal to or greater than a 19.5 percent.
The above condition is present for more than 2 minutes.
The diagnostic runs continuously.