Diagnostic Aids

WARNING: This page is about a different car, the 1997 GMC Savana, 1997 Chevrolet Chevy Van, and 1997 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Inspect VCM connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal to wire connection. Inspect MAF sensor harness routing to ensure it is not too close to high-voltage wires such as spark plug leads. Inspect wiring harness for damage. If harness is okay, observe scan tool while wiggling MAF sensor related connectors and wiring harness. A change in display will indicate location of fault.

A Wide Open Throttle (WOT) acceleration from a stop should cause mass airflow displayed on scan tool to increase from about 4-7 gm/s at idle to 100 gm/s or greater at the time of the 1-2 shift. If mass airflow does not respond as specified, check for restrictions.

IF DTC P0102 cannot be duplicated, FAIL RECORDS data can be useful in determining vehicle mileage since DTC was last set. This may determine how often DTC sets.