Diagnostic Aids
WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Inspect for the following conditions:
- A misrouted harness. Inspect MAF sensor harness to ensure harness is not routed too close to secondary ignition wires or coils, solenoids, relays or motors.
- Throttle plate sticking or excessive deposits on throttle plate or in throttle bore.
- Any unmetered air entering engine may cause this DTC to set. Ensure that the oil dipstick is fully seated and oil fill cap is secure.
- A Wide Open Throttle (WOT) acceleration from a stop should cause mass airflow value displayed on scan tool to increase from about 4-7 grams/second at idle to 130 grams/second or more at time of 1-2 shift. If not inspect for a restriction.
- Barometric pressure that is used to calculate predicted mass airflow value is based on MAP sensor at key on. A skewed MAP sensor will cause calculated mass airflow value to be inaccurate. Value shown for MAP sensor display will vary with altitude. With ignition on and engine off, 103 kPa is approximate value at or about sea level. Value decreases by approximately 3.0 kPa for every 1,000 feet (305 meters) of altitude.