Mazda CX-9 Grand Touring 2009 Manual page 838

If there is continuity, there is a short circuit. Repair or replace the wiring harness.
Throttle body terminal C and power supply
Throttle body terminal C and body ground
Throttle body terminal D and body ground
Throttle body terminal E and power supply
Throttle body terminal F and body ground
Throttle body terminal F and power supply
ACCELERATOR PEDAL POSITION (APP) 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 .)
VOLTAGE INSPECTION
1. Turn the ignition switch to the ON position (Engine OFF).
2. Verify that the PCM terminal 1 AC, 1 AG and 1 AK change smoothly while throttle valve is gradually
opened.
If as verified, go to next step.
If not as verified, perform the "Circuit Open/Short Inspection".
If there is no open or short circuit, replace the throttle body.
3. Verify that the PCM terminal 1 AC, 1 AG and 1 AK voltages are as shown in the following table.
Fig. 18: Identifying PCM Wiring Harness Side-Connector
Courtesy of MAZDA MOTORS CORP.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Control System (MZI-3.7) - Mazda CX-9