Mazda CX-9 Grand Touring 2007 Manual page 323

OPERATION TEST
1. Carry out the "Fuel Injector Operation Inspection". (see ENGINE CONTROL SYSTEM OPERATION
INSPECTION [MZI-3.5] .)
If not as specified, perform the further inspection for the fuel injectors.
RESISTANCE INSPECTION
1. Turn the ignition switch to LOCK position.
2. Disconnect the negative battery cable. (see BATTERY REMOVAL/INSTALLATION [MZI-3.5] .)
3. Remove the engine cover. (see ENGINE COVER REMOVAL/INSTALLATION [MZI-3.5] .)
4. Remove the dynamic chamber. (see INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZI-
3.5] .)
5. Disconnect the fuel injector connectors.
6. Measure the resistance of the fuel injector.
If not as specified, replace the fuel injector. (See FUEL INJECTOR
REMOVAL/INSTALLATION [MZI-3.5].)
If as specified but "Operation Test" is failed, carry out the "Circuit Open/Short Inspection". Inspect
for open or short circuit.
Fuel injector resistance
11-18 ohms
Fig. 47: Identifying Fuel Injector Connector Terminals
Courtesy of MAZDA MOTORS CORP.
CIRCUIT OPEN/SHORT INSPECTION
1. Disconnect the PCM connector.
2. Inspect the following wiring harness for open or short (continuity check).
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Fuel System (MZI-3.5) - CX-9