Test Description

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

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

2

When a DTC fails, some data parameters are recorded and stored for possible diagnostic aid. The stored Freeze Frame/Failure Records can be saved into a scan tool and be reviewed later if necessary in order to help diagnose an intermittent or difficult to reproduce condition.

3

Any stored sensor/circuit DTCs should be diagnosed prior to diagnosing a system type DTC.

5

This DTC determines the calculated air flow based upon the MAP sensor values. The MAP sensor must accurately display manifold pressure in order for this DTC to compare the MAF sensor airflow to the calculated air flow correctly.
A fault not present will be indicated by the MAP Sensor Performance DTC if the MAP sensor is functioning correctly.

6

This DTC determines the calculated air flow based upon the TP sensor values. The TP sensor must accurately display throttle angle in order for this DTC to compare the MAF sensor airflow to the calculated air flow correctly.
This DTC determines the calculated air flow based upon the TP sensor values. The TP sensor must accurately display throttle angle in order for this DTC to compare the MAF sensor airflow to the calculated air flow correctly.