GENERATOR INSPECTION [13B-MSP]

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

Generator Warning Light

1.  Verify that the battery is fully charged.

2.  Verify that the drive belt deflection/tension is within the specification. (See DRIVE BELT DEFLECTION/TENSION INSPECTION [13B-MSP].)

3.  With the ignition switch turn 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 the generator warning light does not go out, perform the DTC inspection, then perform troubleshooting according to the corresponding diagnostic procedure. (See ON-BOARD DIAGNOSTIC TEST [13B-MSP].) (See DTC TABLE [13B-MSP].)


Generator


Voltage

1.  Verify that the battery is fully charged.

2.  Verify that the drive belt deflection/tension is within the specification. (See DRIVE BELT DEFLECTION/TENSION INSPECTION [13B-MSP].)

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.

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Generator standard voltage [IG-ON]
Terminal B: B+
Terminal P: Approx. 1 V or less
Terminal D: Approx. 0 V
Generator standard voltage [Idle, 20 °C {68 °F}]
Terminal B: 13—15 V
Terminal P: Approx. 3—8 V
Terminal D: Turn the electrical loads (headlights, blower motor, rear window defroster, brake lights, etc.) on and verify that the voltage reading increases.


Current

Note
•  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 drive belt deflection/tension is within the specification. (See DRIVE BELT DEFLECTION/TENSION INSPECTION [13B-MSP].)

3.  Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [13B-MSP].)

4.  Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION [13B-MSP].)

5.  Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [13B-MSP].)

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

7.  Connect the negative battery cable.

8.  Turn off all electrical loads.

9.  Start the engine.

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.

10.  Turn the electrical loads (headlights, blower motor, rear window defroster, brake lights, etc.) on and verify that the current reading increases more than the minimum value indicated below.

―  If it is not as specified, go to the PCM and generator shearing inspection. (See PCM and generator shearing inspection.)
Note
•  Current required for generating power varies with the electrical loads applied.

Generator generated current (reference value) [Conditions] Ambient temperature: 20 °C {68 °F}, Voltage: 13—15 V, Engine hot

Engine speed (rpm)

Terminal B current (Lower limit of current must be more than 0 A.)
1,000
0—80 A
2,000
0—112 A


PCM and generator shearing inspection

1.  Connect the M-MDS to the DLC-2.

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2.  Inspect as follows:

Step

Inspection

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, (See ON-BOARD DIAGNOSTIC TEST [13B-MSP].) or measure the PCM 2AJ terminal waveform using an oscilloscope. (See PCM INSPECTION [13B-MSP].)
Is the value normal?
Yes
Go to Step 4.
No
PCM input error.
3
Monitor the ALTT V PID using the M-MDS, (See ON-BOARD DIAGNOSTIC TEST [13B-MSP].) or measure the PCM 2AJ terminal waveform using an oscilloscope. (See PCM INSPECTION [13B-MSP].)
Is the value normal?
Yes
Go to Step 5.
No
PCM input error.
4
Monitor the ALTF PID using the M-MDS, or calculate the duty value of the PCM terminal 2AI using an oscilloscope. Is the duty value 100%?
Yes
PCM input error.
No
 
PCM, generator, or both are not normal.
 
5
Monitor the ALTF PID using the M-MDS, or calculate the duty value of the PCM terminal 2AI using an oscilloscope. Is the duty value 0%?
Yes
PCM input error.
No
PCM, generator, or both are not normal.

*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.

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•  If not within the specification, replace the rotor.
Generator rotor resistance (between slip rings) [20 °C {68 °F}]
1.7—2.0 ohms

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

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•  If there is continuity, replace the rotor.

3.  Inspect the slip ring surface condition.

•  If the slip ring surface is rough, use a lathe or fine sandpaper to smooth it.


Stator coil

1.  Inspect for continuity between the stator coil leads using a tester.

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•  If there is no continuity, replace the stator coil.

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

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•  If there is continuity, replace the stator coil.


Brush

1.  Inspect brushes for wear.

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•  If any brush is worn almost to or beyond the limit, replace all of the brushes.
Generator brush length
Standard: 18.5 mm {0.73 in}
Minimum: 5.0 mm {0.2 in}


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 {0.079 in}.

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•  Replace the brush spring if necessary.
Generator brush spring force
Standard: 4.8—6.0 N {0.49—0.61 kgf, 1.08—1.34 lbf}
Minimum: 2.16 N {0.22 kgf, 0.49 lbf}


Rectifier

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

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•  If not as specified, replace the rectifier.

Specification

Tester

Continuity

Negative

Positive
E
P1, P2, P3, P4
Yes
B
No
P1, P2, P3, P4
E
No
B
Yes


Bearing

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

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•  Replace the bearing if necessary.