Mazda CX-9 Grand Touring 2009 Manual page 864

Fig. 42: Identifying Fuel Tank Pressure Sensor Wiring Harness Side Connector
Courtesy of MAZDA MOTORS CORP.
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZI-3.7].)
2. Disconnect the fuel tank pressure sensor connector.
3. Inspect the following wiring harnesses for open or short. (Continuity inspection)
Open circuit
If there is no continuity, the circuit is open. Repair or replace the wiring harness.
Fuel tank pressure sensor terminal A and PCM terminal 1AB
Fuel tank pressure sensor terminal B and PCM terminal 1AL
Fuel tank pressure sensor terminal C and PCM terminal 1U
Short circuit
If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
Fuel tank pressure sensor terminal A and power supply
Fuel tank pressure sensor terminal A and body ground
Fuel tank pressure sensor terminal B and power supply
Fuel tank pressure sensor terminal C and body ground
2008 Mazda CX-9 Grand Touring
2008 ENGINE Control System (MZI-3.7) - Mazda CX-9