Honda Ridgeline. Manual — part 18
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4-29
Alternator Control Circuit Troubleshooting
BATTERY
ALTERNATOR
4P CONNECTOR
C (WHT/GRN)
PCM CONNECTOR C (44P)
ALT C
(WHT/GRN)
1. Connect the Honda Diagnostic System (HDS) to the
data link connector (DLC), and check for DTCs
(see page 11-3). If a DTC is present, diagnose and
repair the cause before continuing with this test.
2. Disconnect the alternator 4P connector from the
alternator.
3. Start the engine, and turn on the headlights to high
beam.
4. Measure the voltage between alternator 4P
connector terminal No. 2 and the positive terminal
of the battery.
Go to step 9.
Go to step 5.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the
powertrain control module (PCM) from damage.
7. Disconnect PCM connector C (44P).
8. Check for continuity between PCM connector
terminal C38 and body ground.
Repair short in the wire between the
alternator and the PCM.
Update the PCM if it does not have the latest
software (see page 11-7), or substitute a known-
good PCM (see page 11-8), then recheck. If the
symptom/indication goes away with a known-good
PCM, replace the original PCM (see page 11-205).
9. Turn the ignition switch OFF.
10. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the PCM
from damage.
11. Disconnect PCM connector C (44P).
(cont’d)
Wire side of
female terminals
Terminal side of female terminals
Is ther e 1 V or less?
Is ther e continuity?
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4-30
Charging System
Alternator Control Circuit Troubleshooting (cont’d)
PCM CONNECTOR C (44P)
C (WHT/GRN)
ALTERNATOR
4P CONNECTOR
ALT C
(WHT/GRN)
12. Check for continuity between PCM connector
terminal C38 and alternator 4P connector terminal
No. 2.
Replace the alternator (see page 4-34) or
repair the alternator (see page 4-36).
Repair open in the wire between the
alternator and the PCM.
Terminal side of female terminals
Wire side of
female terminals
Is ther e continuity?
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4-31
4-31
Drive Belt Inspection
Drive Belt Replacement
A
B
A
1. Inspect the belt for cracks or damage. If the belt is
cracked or damaged, replace it.
2. Check that the auto-tensioner indicator (A) is within
the standard range (B) as shown. If it is out of the
standard range, replace the drive belt (see page
4-31).
1. Move the auto-tensioner (A) to relieve tension from
the drive belt, then remove the drive belt.
2. Install the new belt in the reverse order of removal.
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Auto-tensioner Spring Torque:
50.5 N·m (5.15 kgf·m, 37.2 lbf·ft)
4-32
Charging System
Drive Belt Auto-tensioner Inspection
A
B
A
D
C
A
1. Check the position of the auto-tensioner indicator’s
pointer (A), start the engine, then check the position
of the pointer again. If the position changes,
replace the auto-tensioner.
2. Check for abnormal noise from the tensioner pulley.
If you hear abnormal noise, replace the auto-
tensioner pulley (see page 4-33).
3. Remove the drive belt (see page 4-31).
4. Move the auto-tensioner within its limit using the
belt tension release tool in the direction shown.
Check that the tensioner moves smoothly and
without any abnormal noise. If the tensioner does
not move smoothly, or you hear abnormal noises,
replace the auto-tensioner (see page 4-33).
5. Remove the auto-tensioner (see page 4-33).
6. Clamp the auto-tensioner (A) by using a 10 mm bolt
(B), 8 mm bolt (C), and a vise (D) as shown. Do not
clamp the auto-tensioner itself.
7. Attach a torque wrench (A) to the pulley bolt.
Measure the torque when the tensioner is turned
counterclockwise and begins to move. If the torque
is less than the specified value, replace the auto-
tensioner (see page 4-33).
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