Mazda CX 7. Manual — part 134
CHARGING SYSTEM [L3 WITH TC]
01-17–7
01-17
9. Turn the following electrical loads 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 01-17-7 PCM and generator
shearing inspection.)
• 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]
PCM and generator shearing inspection
1. Connect the M-MDS to the DLC-2.
2. Inspect as follows:
DLC-2
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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, or measure the
voltage of PCM terminal 2AJ using a tester. Is the voltage
between 13 and 15 V ?
Yes
Go to Step 4.
No
PCM input error.
3
Monitor the ALTT V PID using the M-MDS, or measure the
voltage of PCM terminal 2AJ using a tester. Is the voltage
between 13 and 15 V ?
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.
0V
A
B
B
A
x 100 (%) = DUTY (%)
1871-1U-06B(01-17).fm 7 ページ 2006年3月15日 水曜日 午前10時49分
CHARGING SYSTEM [L3 WITH TC]
01-17–8
*1
: Headlights, blower motor, rear window defroster, and brake lights.
*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.
• If not within the specification, replace the
rotor.
Generator rotor resistance (between slip
rings) [20
°C {68 °F}]
1.8— 2.2 ohm
2. Verify that there is no continuity between the slip
ring and core using a tester.
• 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.
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.
Step
Inspection
Action
0V
A
B
B
A
x 100 (%) = DUTY (%)
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CHARGING SYSTEM [L3 WITH TC]
01-17–9
01-17
Stator coil
1. Verify that the continuity is as indicated in the
table.
• If there is any malfunction, replace the stator.
2. Verify that there is no continuity between the
stator coil leads and core using a tester.
• If there is continuity, replace the stator coil.
Brush
1. Inspect brushes for wear.
• If any brush is worn almost to or beyond the
limit, replace all of the brushes.
Generator brush length
Standard: 22.5 mm {0.89 in}
Minimum: 5.0 mm {0.20 in}
1
2
3
4
5
6
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Terminal
: Continuity
1
2
3
4
5
6
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MINIMUM
STANDARD
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CHARGING SYSTEM [L3 WITH TC]
01-17–10
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}.
• Replace the brush spring if necessary.
Generator brush spring force
Standard: 4.1— 5.3 N {0.42— 0.54 kgf, 0.92—
1.19 lbf}
Minimum: 1.7 N {0.17 kgf, 0.38 lbf}
Rectifier (Using an analog circuit tester)
1. Inspect for continuity of the diodes using an
analog circuit tester.
• If not as specified, replace the rectifier.
Specification
Rectifier (Using a digital circuit tester)
1. Inspect for continuity of the diodes using a digital circuit tester.
• If not as specified, replace the rectifier.
Specification
Bearing
1. Inspect for abnormal noise, looseness, and
sticking.
• Replace the bearing if necessary.
End Of Sie
2 mm
{0.079 in}
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Negative
Positive
Continuity
E
P1, P2, P3, P4,
P5, P6
Yes
B
No
P1, P2, P3, P4,
P5, P6
E
No
B
Yes
P4
P5
P6
P3
P2
P1
E
B
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Negative
Positive
Continuity
E
P1, P2, P3, P4,
P5, P6
No
B
Yes
P1, P2, P3, P4,
P5, P6
E
Yes
B
No
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1871-1U-06B(01-17).fm 10 ページ 2006年3月15日 水曜日 午前10時49分
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