Honda Ridgeline. Manual — part 17
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4-25
Circuit Diagram
ELD
ALTF
ALTL
ALTC
CANL
CANH
B1
B8
A20
X34
D1
A2
A3
A1
G1
D2
A5
BLK/YEL
BLK/YEL
WHT
RED
WHT
5 V
GAUGE CONTROL MODULE
A1
A36
DRIVER
CPU
WHT/BLU
3
B42
L
IG
1
ALTERNATOR
FR
C
YEL
(7.5 A)
No.21
ELD UNIT
A23
IGNITION SWITCH
BAT
IG1
PCM
C41
C38
BLK/YEL
BLK/YEL
No.23 (50 A)
BLK
RECTIFIER
No.18
(15 A)
BATTERY
VOLTAGE REGULATOR
2
4
B
BLK
G202
UNDER HOOD FUSE/RELAY BOX
No.22 (120 A)
BLU/BLK
WHT/RED
WHT/GRN
DRIVER’S UNDER DASH
FUSE/RELAY BOX
IG1 HOT in ON (II)
and START (III)
CHARGING
SYSTEM
INDICATOR
2
6
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YES
NO
YES
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YES
NO
YES
NO
YES
NO
4-26
Charging System
Charging System Indicator Circuit Troubleshooting
PCM CONNECTOR B (44P)
ALT L
(WHT/BLU)
1. Turn the ignition switch ON (II).
Go to step 2.
Go to step 12.
2. Start the engine. Hold the engine speed at
2,000 rpm for 1 minute.
Charging system indicator circuit is OK. Go
to the alternator and regulator circuit
troubleshooting (see page 4-28).
Go to step 3.
3. Do the gauge control module self-diagnostic
function procedure (see page 22-244).
Go to step 4.
Replace the gauge control module (see page
22-263).
4. Turn the ignition switch OFF.
5. Disconnect the alternator 4P connector.
6. Turn the ignition switch ON (II).
NOTE: The charging system indicator may come on
and then go off.
Replace the alternator (see page 4-34) or
repair the alternator (see page 4-36).
Go to step 7.
7. Turn the ignition switch OFF.
8. Connect the Honda Diagnostic System (HDS) to the
data link connector (DLC).
9. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the
powertrain control module (PCM) from damage.
10. Disconnect PCM connector B (44P).
11. Check for continuity between PCM connector
terminal B42 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).
Terminal side of female terminals
Does the char ging system indicator come on?
Does the char ging system indicator go of f ?
Does the char ging system indicator f lash?
Does the char ging system indicator go of f ?
Is ther e continuity?
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YES
NO
YES
NO
YES
NO
4-27
ALTERNATOR 4P CONNECTOR
L
(WHT/BLU)
JUMPER
WIRE
PCM CONNECTOR B (44P)
ALT L
(WHT/BLU)
ALTERNATOR 4P
CONNECTOR
12. Do the gauge control module self-diagnostic
function procedure (see page 22-244).
Go to step 13.
Replace the gauge control module (see page
22-263).
13. Turn the ignition switch OFF.
14. Disconnect the alternator 4P connector.
15. Connect alternator 4P connector terminal No. 3 and
body ground with a jumper wire.
16. Turn the ignition switch ON (II).
Replace the alternator (see page 4-34) or
repair the alternator (see page 4-36).
Go to step 17.
17. Turn the ignition switch OFF.
18. Connect the HDS to the DLC (see step 2 on page
11-3).
19. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the PCM
from damage.
20. Disconnect PCM connector B (44P).
21. Check for continuity between PCM connector
terminal B42 and alternator 4P connector terminal
No. 3.
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).
Repair open in the wire between the
alternator and the PCM.
Wire side of female terminals
Terminal side of female terminals
Does the char ging system indicator f lash?
Does the char ging system indicator come on?
Is ther e continuity?
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YES
NO
YES
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YES
NO
4-28
Charging System
Alternator and Regulator Circuit Troubleshooting
LOAD ADJUSTER
(CARBON PILE)
VOLT
SELECTOR
FIELD
SELECTOR
TEST
SELECTOR
SWITCH
INDUCTIVE
PICKUP
B TERMINAL
INDUCTIVE
PICKUP (GRN)
POSITIVE
TERMINAL
CABLE (RED)
NEGATIVE
TERMINAL
CABLE (BLK)
VOLTMETER
POSITIVE
LEAD (RED)
VOLTMETER
NEGATIVE
LEAD (BLK)
FULL FIELD TESTER
LEAD (BLU)
1. Make sure the battery connections are good and
the battery is sufficiently charged (see page 22-74).
2. Connect a VAT-40 (or equivalent tester), and turn
the selector switch to position 1 (starting).
3. Start the engine. Hold the engine speed at 3,000
rpm, with no load until the radiator fan comes on,
then let it idle.
4. Raise the engine speed to 2,000 rpm, and hold it
there.
Check the alternator mounting bolt torque. If
they are loose, retorque them. If the bolts are tight,
replace the alternator (see page 4-34) or rear
housing assembly (see page 4-36).
Go to step 5.
5. Release the accelerator pedal, and let the engine
idle.
6. Turn off all the accessories. Select the charging test
on the tester.
7. Remove the inductive pickup, and zero the
ammeter.
8. Place the inductive pickup over the B terminal wire
of the alternator so the arrow points away from the
alternator.
9. Raise the engine speed to 2,000 rpm, and hold it
there.
Go to alternator control circuit
troubleshooting (see page 4-29).
Go to step 10.
10. Apply a load with the VAT-40 until the battery
voltage drops to between 12
13.5 V.
The charging system is OK.
NOTE: If the charging system indicator is still on,
replace the alternator (see page 4-34).
Replace the alternator (see page 4-34) or
repair the alternator (see page 4-36).
Is the voltage over 15.1 V ?
Is the voltage less than 13.5 V ?
Is the amper age 87 .5 A or mor e?
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