Acura CSX. Manual — part 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?
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−
−
−
−
−
−
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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