Mazda CX-9 Grand Touring. Manual — part 410
Courtesy of MAZDA MOTORS CORP.
2. Pull the clip parallel to the injector groove, and remove it from the injector.
3. Discard the clip.
Fig. 45: Pulling Clip To Injector Groove
Courtesy of MAZDA MOTORS CORP.
FUEL INJECTOR INSTALLATION NOTE
1. Install the new O-ring.
2. Lightly lubricate the injector groove and O-ring.
3. Pre-attach a new clip in the injector groove.
4. Hold the injector firmly, push the clip into the injector until the clip stops sliding.
5. Verify that the injector connector position is correct, and press the injector and clip into the injector cup.
Continue pressing until the clip contacts the lower surface of the injector cup.
6. Verify that the injector and clip are correctly attached with the clip locked onto the injector cup notch.
Fig. 46: Pushing Clip Into Injector
Courtesy of MAZDA MOTORS CORP.
FUEL INJECTOR INSPECTION [MZI-3.7]
NOTE:
When the clip is attached correctly, the central area of the injector
and the clip finger positions are aligned.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:04:45 AM
Page 34
© 2005 Mitchell Repair Information Company, LLC.
OPERATION TEST
1. Carry out the "Fuel Injector Operation Inspection". (See ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-3.7] .)
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-3.7] .)
3. Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7] .)
4. Remove the dynamic chamber. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZI-
3.7] .)
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-3.7].)
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 Connectors
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).
NOTE:
Perform the following inspection only when directed.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:04:45 AM
Page 35
© 2005 Mitchell Repair Information Company, LLC.
Fig. 48: Identifying Fuel Pump Unit Wiring Harness-Side Connector
Courtesy of MAZDA MOTORS CORP.
Fig. 49: Identifying Main Fuse Block (Fuel Pump Relay)
Courtesy of MAZDA MOTORS CORP.
Fig. 50: Identifying PCM Wiring Harness-Side Connector
Courtesy of MAZDA MOTORS CORP.
Open circuit
2008 Mazda CX-9 Grand Touring
2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:04:45 AM
Page 36
© 2005 Mitchell Repair Information Company, LLC.
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
Microsoft
Sunday, November 15, 2009 10:04:45 AM
Page 37
© 2005 Mitchell Repair Information Company, LLC.
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