Acura CSX. Instruction — page 20

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YES

NO

YES

NO

4-29

Alternator Control Circuit Troubleshooting

BATTERY

ALTERNATOR
4P CONNECTOR

C (WHT/GRN)

ALT C
(WHT/GRN)

ECM/PCM CONNECTOR B (44P)

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

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

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

3. 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).

4. Check for DTCs (see page 11-3). If a DTC is present,

diagnose and repair the cause before continuing
with this test.

5. Disconnect the alternator 4P connector.

6. Start the engine, and turn on the headlights to high

beam.

7. Measure the voltage between alternator 4P

connector terminal No. 2 and the positive terminal
of the battery.

Go to step 11.

Go to step 8.

8. 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.

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

10. Check for continuity between ECM/PCM connector

terminal B41 and body ground.

Repair short to ground in the wire between

alternator 4P connector terminal No. 2 and ECM/
PCM connector terminal B41.

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).

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).

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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YES

NO

4-30

4-30

Charging System

Drive Belt Inspection

C (WHT/GRN)

ALTERNATOR
4P CONNECTOR

ALT C
(WHT/GRN)

ECM/PCM CONNECTOR B (44P)

A

B

13. Check for continuity between ECM/PCM connector

terminal B41 and alternator 4P connector terminal
No. 2.

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

repair the alternator (see page 4-38).

Repair open in the wire between alternator 4P

connector terminal No. 2 and ECM/PCM connector
terminal B41.

1. Inspect the belt for cracks or damage. If the belt is

cracked or damaged, replace it (see page 4-31).

2. Check the position of 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).

Wire side of
female terminals

Terminal side of female terminals

Is ther e continuity?

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02

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Special Tools Required

Special Tools Required

4-31

4-31

Drive Belt Replacement

Drive Belt Auto-tensioner
Inspection

YA9317

A

B

A

YA9317

Belt tension release tool Snap-on YA9317 or equivalent,
commercially available

1. Move the auto-tensioner (A) using the belt tension

release tool to relieve tension from the drive belt
(B), then remove the drive belt.

2. Install the new drive belt in the reverse order of

removal.

Belt tension release tool Snap-on YA9317 or equivalent,
commercially available

1. Turn the ignition switch to ON (II), and make sure

the A/C switch is OFF, then turn the ignition switch
to LOCK (0).

2. Check the position of the auto-tensioner indicator’s

pointer (A). Start the engine then check the position
again with the engine idling. If the position of the
indicator moves or fluctuates very much, replace
the auto-tensioner (see page 4-32).

3. Check for abnormal noise from the tensioner pulley.

If you hear abnormal noise, replace the tensioner
pulley (see page 4-33).

4. Remove the drive belt (see page 4-31).

5. 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 noise,
replace the auto-tensioner (see page 4-32).

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04

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Auto-tensioner Spring Torque:
32.5

39.7 N·m (3.31

4.05 kgf·m, 23.9

29.3 lbf·ft)

4-32

4-32

Charging System

Drive Belt Auto-tensioner Removal/
Installation

A

B

C

E

F

8 x 1.25 mm
22 N·m
(2.2 kgf·m, 16 lbf·ft)

6 x 1.0 mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)

A
10 x 1.25 mm
56 N·m (5.7 kgf·m, 41 lbf·ft)

B

30 °

30 °

D

6. Remove the auto-tensioner (see page 4-32).

7. Clamp the auto-tensioner (A) by using two 8 mm

bolts (B) and a vise (C) as shown. Do not clamp the
auto-tensioner itself.

8. Set the torque wrench (D) on the pulley bolt, and

align it as shown.

9. Align the indicator’s pointer (E) on the tensioner

base with center mark (F) on the tensioner arm by
using the torque wrench, and measure the torque.
If the torque value is out of specification, replace
the auto-tensioner.

NOTE: If the indicator exceeds the center mark,
recheck the torque.

1. Remove the drive belt (see page 4-31).

2. Remove the idler pulley base.

3. Remove the pulley bolt (A), then remove the

tensioner pulley (B).

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