Diagnostic Aids

Inspect for the following conditions:

• A high resistance on any of the MAF sensor circuits except the low reference may cause this DTC to set intermittently and also result in poor engine performance.
• A high resistance on the 5-volt reference of the MAF sensor may result in poor engine performance without setting this DTC.
• A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor.
• Any contamination of the hot element of the MAF sensor may cause this DTC to set.
• A wide-open throttle acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 3-7 g/s at idle to 72 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.

If an intermittent condition exists, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.