Mazda CX-9 Grand Touring 2009 Manual page 831

If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
PSP switch terminal A and body ground
MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR
REMOVAL/INSTALLATION [MZI-3.7]
1. Disconnect the negative battery cable.
2. Disconnect MAF/IAT sensor connector.
3. Remove the MAF/IAT sensor.
4. Install in the reverse order of removal.
Fig. 10: Identifying MAF/IAT Sensor Connector, Bolts & Torque Specifications
Courtesy of MAZDA MOTORS CORP.
MASS AIR FLOW (MAF) SENSOR INSPECTION [MZI-3.7]
NOTE:
Before performing the following inspection, make sure to follow the
procedure as indicated in the troubleshooting flowchart. (See HOW TO
USE THIS MANUAL .)
VISUAL INSPECTION
1. Verify the following items of the MAF sensor.
Damage, cracks
Rusted sensor terminal
Bent sensor terminal
If there is any malfunction, replace the MAF sensor. (See MASS AIR FLOW
(MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR
REMOVAL/INSTALLATION [MZI-3.7].)
2008 Mazda CX-9 Grand Touring
2008 ENGINE Control System (MZI-3.7) - Mazda CX-9