Mazda CX-9 Grand Touring. Manual - part 140

Fig. 5: Identifying Generator, Generator Connector, Lower Bolt & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

GENERATOR LOWER BOLT REMOVAL NOTE

1. Fully loosen the generator lower bolt.

NOTE:



The generator lower bolt cannot be fully removed from the engine because
it contacts the body frame. However, the generator can be
removed/installed without fully removing the lower bolt because there is a
notch at the lower bolt installation part of the generator.

2008 Mazda CX-9 Grand Touring

2008 ENGINE Charging System (MZI-3.7) - Mazda CX-9

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Fig. 6: Identifying Notch
Courtesy of MAZDA MOTORS CORP.

GENERATOR REMOVAL NOTE

1. Remove the generator from above the engine compartment.

GENERATOR INSTALLATION NOTE

1. Tighten the upper and lower bolts temporarily.

2. Tighten the upper bolt to the specified tightening torque.

3. Tighten the lower bolt to the specified tightening torque.

GENERATOR INSPECTION [MZI-3.7]

GENERATOR WARNING LIGHT

1. Verify that the battery is fully charged.

2. Verify that the generator and A/C drive belt deflection/tension is correct. (See DRIVE BELT

INSPECTION [MZI-3.7] .)

3. With the ignition switch turned to the ON position, verify that the generator warning light illuminates.



If it does not illuminate, inspect the generator warning light and the wiring harness.



If the generator warning light and the wiring harness are normal, inspect the PCM.

4. Verify that the generator warning light goes out after the engine is started.



If it does not go out, inspect if any DTCs are displayed.



If any DTCs are displayed, carry out troubleshooting according to the corresponding DTC
inspection.

GENERATOR

Voltage

1. Verify that the battery is fully charged.

2. Verify that the generator and A/C drive belt deflection/tension is correct. (See DRIVE BELT

2008 Mazda CX-9 Grand Touring

2008 ENGINE Charging System (MZI-3.7) - Mazda CX-9

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Sunday, November 15, 2009 9:54:57 AM

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INSPECTION [MZI-3.7] .)

3. Turn off all electrical loads.

4. Start the engine.

5. Verify that the generator rotates smoothly without any noise while the engine is running.



If there is any noise, find the cause and repair or replace the generator.

6. Measure the voltage at each terminal using a tester.



If it is not as specified, find the cause and repair or replace the applicable part.

Generator standard voltage [IG-ON]

Terminal B: B+

Terminal A: B+

Terminal RC: Approx. 1 V or less

Terminal LI: Approx. 1 V

Generator standard voltage [Idle, 20°C {68 °F}]

Terminal B: 12-16 V

Terminal A: 12-16 V

Terminal RC: 0-16 V

Terminal LI: 1-16 V

Fig. 7: Identifying Connector Terminal
Courtesy of MAZDA MOTORS CORP.

Current

NOTE:



Since the charging current decreases rapidly after starting the engine,
carry out the following procedure quickly, and read the maximum current

2008 Mazda CX-9 Grand Touring

2008 ENGINE Charging System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:54:58 AM

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1. Verify that the battery is fully charged.

2. Verify that the generator and A/C drive belt deflection/tension is correct. (See DRIVE BELT

INSPECTION [MZI-3.7] .)

3. Disconnect the negative battery cable.

4. Connect a tester, which can read 120 A or more , between generator terminal B and the wiring harness.

5. Connect the negative battery cable.

6. Turn off all electrical loads.

7. Start the engine.

8. Increase engine speed to 2,500 rpm .

9. Turn the following electrical loads on and verify that the current reading increases more than the

minimum value indicated below.



Headlights (high-beam)



Blower motor (HI)



Rear window defroster



Brake lights

Generator generated current minimum value

70 % of the nominal output current (nominal output current: 110 A)

[Ambient temp. 20°C {68 °F}, voltage 13.0-15.0 V, both engine and generator are hot]

GENERATOR INNER PARTS

Rotor

1. Measure the resistance between the slip rings using a tester.



If not within the specification, replace the rotor.

Generator rotor resistance (between slip rings) [20 °C {68 °F}]

value.

NOTE:



When the electrical load on the vehicle is low, the specified current
cannot be verified although the generator is normal. In this case,
increase the electrical load (Leave the headlights turned on for a
while, then discharge the battery, or use a similar method.) and
recheck.



When the generator itself or the ambient temperature are too high,
the specified current also cannot be verified. In this case, cool down
the generator and recheck.

2008 Mazda CX-9 Grand Touring

2008 ENGINE Charging System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:54:58 AM

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