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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Control System Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P0172: Rich Fuel Trim System (Bank 1) >> Test Description

Test Description

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The numbers below refer to the step numbers in the diagnostic procedures.

  1. 5

    If no condition was found, diagnose fuel system for possible fuel condition.

  2. 6

    An EVAP canister that is saturated will cause a rich condition. Fuel in the vacuum line to the fuel pressure regulator indicates a bad regulator. If no conditions are found, a worn cam, worn intake or exhaust valves, or other engine mechanical failure may be at fault.
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