Mazda CX-9 Grand Touring 2009 Manual page 1640

If there is no continuity, the circuit is open. Repair or replace the harness.
No.1 cylinder fuel injector terminal A and PCM terminal 2BJ
No.2 cylinder fuel injector terminal A and PCM terminal 2BM
No.3 cylinder fuel injector terminal A and PCM terminal 2BF
No.4 cylinder fuel injector terminal A and PCM terminal 2BH
No.5 cylinder fuel injector terminal A and PCM terminal 2BB
No.6 cylinder fuel injector terminal A and PCM terminal 2BD
No.1 cylinder fuel injector terminal B and fuel pump relay terminal D
No.2 cylinder fuel injector terminal B and fuel pump relay terminal D
No.3 cylinder fuel injector terminal B and fuel pump relay terminal D
No.4 cylinder fuel injector terminal B and fuel pump relay terminal D
No.5 cylinder fuel injector terminal B and fuel pump relay terminal D
No.6 cylinder fuel injector terminal B and fuel pump relay terminal D
Short circuit
If there is continuity, the circuit is short. Repair or replace the harness.
No.1 cylinder fuel injector terminal A and body ground
No.2 cylinder fuel injector terminal A and body ground
No.3 cylinder fuel injector terminal A and body ground
No.4 cylinder fuel injector terminal A and body ground
No.5 cylinder fuel injector terminal A and body ground
No.6 cylinder fuel injector terminal A and body ground
No.1 cylinder fuel injector terminal B and power supply
No.2 cylinder fuel injector terminal B and power supply
No.3 cylinder fuel injector terminal B and power supply
No.4 cylinder fuel injector terminal B and power supply
No.5 cylinder fuel injector terminal B and power supply
No.6 cylinder fuel injector terminal B and power supply
ATOMIZATION
1. Inspect atomization pattern.
If the atomization is faulty, replace the fuel injector. (See FUEL INJECTOR
REMOVAL/INSTALLATION [MZI-3.7].)
2008 Mazda CX-9 Grand Touring
2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9