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Mazda CX-5 Service & Repair Manual: Generator Inspection [Skyactiv G 2.0]

Mazda CX-5 Service & Repair Manual / Electrical / Starting, Charging / Generator Inspection [Skyactiv G 2.0]

CAUTION:

  1. Do not apply direct battery positive voltage to generator terminal D, otherwise it could cause damage to the internal parts (power transistor) of the generator.

Charging system warning Light

1. Verify that the battery is fully charged.

2. Verify that the assembly condition of the drive belt is correct..

3. Switch the ignition to ON, verify that the charging system warning light illuminates.

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

Generator

Voltage

1. Verify that the battery is fully charged.

2. Verify that the assembly condition of the drive belt is correct..

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.

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


Current

NOTE:

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

1. Verify that the battery is fully charged.

2. Verify that the assembly condition of the drive belt is correct..

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.

NOTE:

  1. 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.

  2. 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.

9. With the electric loads such as headlights, blower motor, rear window defroster, brake lights turned on, verify that the current increases.

  1. If it is not as specified, go to the PCM and generator shearing inspection..

PCM and generator shearing inspection

1. Connect the M-MDS to the DLC-2.

2. Inspect as follows:

Step

Inspection

Results

Action

1

Measure the generator terminal B voltage when the electrical loads*1 are on and off.

15 V or more

Go to Step 2.

13—15 V

Normal*2

13 V or less

Go to Step 3.

2

Monitor the ALTT V PID using the M-MDS..

Is the value normal?

Yes

Go to Step 4.

No

Inspect the following, then repair or replace as necessary.

  • If there is no malfunction, replace the PCM.

    • Wiring harness between PCM terminal 1AF- generator terminal P.

    • Wiring harness between PCM terminal 1BE- generator terminal D.

    • Generator inner parts.

  • If that is not malfunction, replace the PCM.

    (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

3

Monitor the ALTT V PID using the M-MDS..

Is the value normal?

Yes

Go to Step 5.

No

Inspect the following, then repair or replace as necessary.

  • If there is no malfunction, replace the PCM.

    • Wiring harness between PCM terminal 1AF- generator terminal P.

    • Wiring harness between PCM terminal 1BE- generator terminal D.

    • Generator inner parts.

  • If that is not malfunction, replace the PCM.

    (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

4

Monitor the ALTF PID using the M-MDS.

Is the duty value 100%?

Yes

Replace PCM.

No

Inspect the following, then repair or replace as necessary.

  • If there is no malfunction, replace the PCM.

    • Wiring harness between PCM terminal 1BE- generator terminal D.

    • Generator inner parts.

  • If that is not malfunction, replace the PCM.

    (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

5

Monitor the ALTF PID using the M-MDS.

Is the duty value 0%?

Yes

Replace PCM.

No

Inspect the following, then repair or replace as necessary.

  • If there is no malfunction, replace the PCM.

    • Wiring harness between PCM terminal 1BE- generator terminal D.

    • Generator inner parts.

  • If that is not malfunction, replace the PCM.

    (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)


*1 Headlights, blower motor, rear window defroster, brake lights, etc.

*2 If the generator field coil duty value does not change when electrical loads (such as headlights, blower motor, rear window defroster, brake lights) are on or off, inspection with discharged battery is needed.

Generator Inner Parts

Rotor

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


2. Verify that there is no continuity between the slip ring and core using a tester.


3. Inspect the slip ring surface condition.

Stator coil

1. Verify that the continuity is as indicated in the table.



2. Verify that there is no continuity between the stator coil leads and core using a tester.


Brush

1. Inspect brushes for wear.


Brush spring

1. Measure the force of the brush spring using a spring pressure gauge.

2. Read the spring pressure gauge at the brush tip projection of 2 mm {0.08 in}.


Rectifier (Using an analog circuit tester)

1. Inspect for continuity of the diodes using an analog circuit tester.


Specification


Negative

Positive

Continuity

E

P1, P2, P3, P4, P5, P6

Yes

B

No

P1, P2, P3, P4, P5, P6

E

No

B

Yes


Rectifier (Using a digital circuit tester)

1. Inspect for continuity of the diodes using a digital circuit tester.

Specification


Negative

Positive

Continuity

E

P1, P2, P3, P4, P5, P6

No

B

Yes

P1, P2, P3, P4, P5, P6

E

Yes

B

No


Bearing

1. Inspect for abnormal noise, looseness, and sticking.


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