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Honda Ridgeline. Manual - part 17

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4-25

Circuit Diagram

ELD

ALTF

ALTL

ALTC

CANL

CANH

A20

X34

BLK/YEL

WHT

RED

WHT

5 V

GAUGE CONTROL MODULE

A36

DRIVER

CPU

WHT/BLU

B42

ALTERNATOR

YEL

(7.5 A)

No.21

ELD UNIT

A23

IGNITION SWITCH

BAT

IG1

PCM

C41

C38

BLK/YEL

No.23 (50 A)

BLK

RECTIFIER

No.18
(15 A)

BATTERY

VOLTAGE REGULATOR

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

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YES

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?

０２

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YES

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

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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