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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 71 (Engine Controls Self-Diagnostics - 2.2L CNG) >> Diagnostic Tests >> DTC P1201: Actual Gas Flow Rate Does Not Match Desired Gas Flow Rate >> Diagnostic Aids

Diagnostic Aids

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.

Connect scan tool and perform a snapshot of AF ECM data parameters when this DTC sets. Compare actual gas circuit gas flow to mass air flow to determine if a rich or lean condition is occurring. If actual gas circuit flow is more than high limit, then Gas Mass Sensor/Mixture Control Valve (GMS/MCV) is adding fuel to compensate for a lean engine condition.

A fault not present indicates the condition that caused the DTC to set is intermittent and not currently present. Refer to INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM. If any additional DTCs were stored, proceed to the applicable DTC. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .

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