Circuit Description

WARNING: This page is about a different variant/trim than selected.

The Mass Airflow (MAF) sensor measures the amount of air entering the engine during a given time. PCM uses MAF sensor information to monitor EGR flow rates. A large quantity of air entering the engine indicates an acceleration, high load situation or no EGR flow, while a small quantity of air entering the engine indicates deceleration, idle or full EGR operation.

PCM will monitor MAF and EGR pressures at different ranges to determine correct EGR flow rates.

DTC will also when the following conditions are present:

DTCs P0102, P0103, P0405 or P0406 not set.
All MAF and EGR control pressure test complete (internal to PCM).
IAT is greater than or equal to 68°F (20°C) or less than or equal to 203°F (95°C).
ALM cells not changed for greater than 2 seconds.
Fuel rate 10-25 mm.
Engine speed 1500-2100 RPM.
Engine speed stable.
The listed conditions are met for greater than 3 seconds.

NOTE: For circuit reference, see Figure . For connector and terminal identification, see CONNECTOR IDENTIFICATION .