Acura CSX. Instruction — page 19

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4-25

Circuit Diagram

6

3

19

1

F5

17

D2

A3

A2

H1

ELD

CANL

CANH

ALTF

ALTC

ALTL

5 V

ALTERNATOR

DRIVER

YEL

FR

L

C

IG

BRN

ELD

A23

GAUGE CONTROL MODULE (TACH)

IGNITION SWITCH

BAT

IG1

B43

B42

B41

A37

A36

RED

WHT

CPU

YEL

1

BLK/YEL

No. 2 (50 A)

BLK

RECTIFIER

BATTERY

VOLTAGE REGULATOR

2

3

4

B

BLK

G301

UNDER-HOOD FUSE/RELAY BOX

No. 1 (100 A)

ORN

WHT/RED

WHT/GRN

WHT/BLU

UNDER-DASH
FUSE/RELAY BOX

CHARGING
SYSTEM
INDICATOR

IG1 HOT in ON (II)
and START (III)

A1

ECM/PCM

BLU

Q9

WHT

22

17

C101

CANH

CANL

YEL

No. 10
(7.5 A)

No. 3
(10 A)

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YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

4-26

Charging System

Charging System Indicator Circuit Troubleshooting

ALT L
(WHT/BLU)

ECM/PCM CONNECTOR B (44P)

NOTE: Check for stored DTCs in the PGM-FI before
troubleshooting the charging system indicator.

1. Turn the ignition switch to ON (II).

Go to step 2.

Go to step 14.

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 22-241).

Go to step 4.

Replace the gauge control module (tach)

(see page 22-277).

4. Turn the ignition switch to LOCK (0).

5. Disconnect the alternator 4P connector.

6. Turn the ignition switch to ON (II).

Replace the alternator (see page 4-34), or

repair the alternator (see page 4-38).

Go to step 7.

7. Turn the ignition switch to LOCK (0).

8. Connect the Honda Diagnostic System (HDS) to the

data link connector (DLC) (see step 2 on page 11-3).

9. Turn the ignition switch to ON (II).

10. Make sure the HDS communicates with the vehicle

and the engine control module (ECM)/powertrain
control module (PCM). If it does not communicate,
troubleshoot the DLC circuit (see page 11-204).

11. Jump the SCS line with the HDS, then turn the

ignition switch to LOCK (0).

NOTE: This step must be done to protect the ECM/
PCM from damage.

12. Disconnect ECM/PCM connector B (44P).

13. Check for continuity between ECM/PCM connector

terminal B42 and body ground.

Repair short to ground in the wire between

alternator 4P connector terminal No. 3 and ECM/
PCM connector terminal B42.

Update the ECM/PCM if it does not have the

latest software (see page 11-227), or substitute a
known-good ECM/PCM (see page 11-7), then
recheck. If the symptom/indication goes away with
a known-good ECM/PCM, replace the original ECM/
PCM (see page 11-228).

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?

*01

*02

YES

NO

YES

NO

YES

NO

4-27

ALTERNATOR 4P CONNECTOR

L
(WHT/BLU)

JUMPER
WIER

ALT L
(WHT/BLU)

ECM/PCM CONNECTOR B (44P)

L
(WHT/BLU)

ALTERNATOR
4P CONNECTOR

14. Do the gauge control module self-diagnostic

function procedure (see page 22-241).

Go to step 15.

Replace the gauge control module (tach)

(see page 22-277).

15. Turn the ignition switch to LOCK (0).

16. Disconnect the alternator 4P connector.

17. Connect alternator 4P connector terminal No. 3 and

body ground with a jumper wire.

18. Turn the ignition switch to ON (II).

Replace the alternator (see page 4-34), or

repair the alternator (see page 4-38).

Disconnect the jumper wire, then go to step

19.

19. Turn the ignition switch to LOCK (0).

20. Connect the HDS to the DLC (see step 2 on page

11-3).

21. Turn the ignition switch to ON (II).

22. Make sure the HDS communicates with the vehicle

and the ECM/PCM. If it does not communicate,
troubleshoot the DLC circuit (see page 11-204).

23. Jump the SCS line with the HDS, then turn the

ignition switch to LOCK (0).

NOTE: This step must be done to protect the ECM/
PCM from damage.

24. Disconnect ECM/PCM connector B (44P).

25. Check for continuity between ECM/PCM connector

terminal B42 and alternator 4P connector terminal
No. 3.

Update the ECM/PCM if it does not have the

latest software (see page 11-227), or substitute a
known-good ECM/PCM (see page 11-7), then
recheck. If the symptom/indication goes away with
a known-good ECM/PCM, replace the original ECM/
PCM (see page 11-228).

Repair open in the wire between alternator 4P

connector terminal No. 3 and ECM/PCM connector
terminal B42.

Wire side of female terminals

Terminal side of female terminals

Wire 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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Special Tools Required

YES

NO

YES

NO

4-28

Charging System

Alternator and Regulator Circuit Troubleshooting

OTC3131

Alternator, Regulator, Battery & Starter tester OTC3131
Available through the Honda Canada Inc. Technical
Tools Department; FAX

866-398-8665/e-mail:

ch_technicaltools

ch.honda.com

1. Make sure the battery connections are good and

the battery is sufficiently charged.

2. Connect the alternator, regulator, battery & starter

tester (OTC3131) to the battery as shown.

3. Start the engine. Hold the engine speed at

3,000 rpm with no load (in N or P (A/T model) or
neutral (M/T model)) until the radiator fan comes
on, then let it idle.

4. Do the CHARGING SYSTEM TEST.

Go to step 5.

If the voltage is less than 13.5 V, go to

alternator control circuit troubleshooting (see page
4-29). If the voltage is over 15.1 V and amperage is
less than 87.5 A, replace the alternator (see page
4-34) or repair the alternator (see page 4-38).

5. Check the diode condition on the display.

The diode is OK. Troubleshooting is

complete.

If the display indicates BAD, replace the

alternator (see page 4-34) or repair the alternator
(see page 4-38), then retest.

NOTE: If the display indicates N/A, the diode
pattern could not be diagnosed. Repeat the test
again. If test is complete, use multimeter to
perform further pinpoint testing, then retest.

Does the display indicate the voltage is within
13.5

15.1 V the amper age is 87 .5 A or mor e?

Does the display indicate GOOD?

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