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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Engine Controls Self-Diagnostics - 2.2L CNG) >> Diagnostic Tests >> DTC P1201: Actual Gas Flow Rate Does Not Match Desired Gas Flow Rate >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The number below refer to the step number on the diagnostic procedure.

  1. 4

    This step inspects the vehicle for conditions that would cause the actual gas circuit frequency to operate outside the expected range for a given engine air flow.

  2. 5

    This step determines if the fault is still present.

  3. 7

    This step tests the CNG system for proper fuel pressures.

  4. 9

    This step determines if a base engine condition exists that would also require the PCM to make a large fuel trim adjustment.

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