Mazda CX-9 Grand Touring 2009 Manual page 832

VOLTAGE INSPECTION
1. Remove the MAF sensor with the connector still connected.
2. Turn the ignition switch to the ON position.
3. Verify that the MAF sensor output voltage (M-MDS monitor item: MAF) changes when wind is
introduced gradually to the sensor part of the MAF sensor.
If it cannot be verified even though the related harnesses have no malfunction, replace the MAF
sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR
REMOVAL/INSTALLATION [MZI-3.7].)
If the monitor item status/specification (reference) is not within the specification, even though the
resistance is within the specification, perform the "Circuit Open/Short Inspection".
CIRCUIT OPEN/SHORT INSPECTION
Fig. 11: Identifying MAF/IAT Sensor And PCM Wiring Harness Side Connector
Courtesy of MAZDA MOTORS CORP.
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZI-3.7].
2. Disconnect the MAF/IAT sensor connector.
3. Inspect the following wiring harnesses for open or short. (Continuity inspection)
2008 Mazda CX-9 Grand Touring
2008 ENGINE Control System (MZI-3.7) - Mazda CX-9