Acura CSX. Instruction — page 159

06

01

SNR9A00A20336112931FAAT00

YES

NO

YES

NO

YES

NO

11-307

11-307

Alternator FR Signal Circuit
Troubleshooting

ECM/PCM CONNECTOR A (44P)

ACC (RED)

JUMPER WIRE

ECM/PCM CONNECTOR B (44P)

ALTF
(WHT/RED)

13. Momentarily connect ECM/PCM connector terminal

A14 to body ground with a jumper wire several
times.

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).

Check for poor connections or loose terminals

at the A/C clutch relay and the ECM/PCM. If the
connections and the terminals are OK, check the
A/C compressor clutch relay (see page 22-70),
repair open in the wires between the ECM/PCM
(A14), the A/C compressor clutch relay, and other
A/C systems parts.

1. Start the engine, and let it idle.

2. Monitor the ALTERNATOR in the DATA LIST with

the HDS.

3. Check if the indicated percentage varies when the

headlight switch is turned on.

The alternator signal circuit is OK.

Go to step 4.

4. Turn the headlight switch and ignition switch to

LOCK (0).

5. Jump the SCS line with the HDS.

6. Disconnect the alternator 4P connector.

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

8. Check for continuity between body ground and

ECM/PCM connector terminal B43.

Repair short in the wire between the ECM/

PCM (B43) and the alternator.

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

Terminal side of female terminals

Is ther e a clicking noise f r om the A/ C compr essor
clutch?

Does the per centage var y?

Is ther e continuity?

08/08/21 14:29:37 61SNR030_110_0307

01

SNR9A00A20336114806FAAT00

YES

NO

YES

NO

YES

NO

11-308

Idle Control System

Brake Pedal Position Switch Signal Circuit Troubleshooting

ECM/PCM CONNECTOR A (44P)

BKSW (LT GRN)

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

2. Check the BRAKE SWITCH in the DATA LIST with

the HDS.

Go to step 3.

Inspect the brake pedal position switch

(see page 19-6).

3. Press the brake pedal while checking the BRAKE

SWITCH in the DATA LIST with the HDS.

The brake pedal position switch signal circuit

(BKSW line) is OK.

Go to step 4.

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

5. Jump the SCS line with the HDS.

6. Disconnect the brake pedal position switch 4P

connector.

7. Disconnect ECM/PCM connector A (44P).

8. Check for continuity between ECM/PCM connector

terminal A40 and body ground.

Repair short in the wire between the ECM/

PCM (A40) and the No. 12 HORN/STOP (15 A) fuse.
Also, replace the No. 12 HORN/STOP (15 A) fuse.

Go to step 9.

Terminal side of female terminals

Does it indicate OF F ?

Does it change to ON?

Is ther e continuity?

08/08/21 14:29:37 61SNR030_110_0308

02

03

01

SNR9A00A20336100000MAAT00

YES

NO

11-309

11-309

Idle Speed Inspection

BRAKE PEDAL POSITION SWITCH
4P CONNECTOR

BKSW
(LT GRN)

JUMPER WIRE

ECM/PCM CONNECTOR A (44P)

BKSW (LT GRN)

A

9. Connect brake pedal position switch 4P connector

terminal No. 2 to body ground with a jumper wire.

10. Check for continuity between ECM/PCM connector

terminal A40 and body ground.

Repair open in the wire between the brake

pedal position switch and the No. 12 HORN/STOP
(15 A) fuse. Also, inspect the brake pedal position
switch (see page 19-6).

Repair open in the wire between the ECM/

PCM (A40) and the brake pedal position switch.

NOTE:

• Before checking the idle speed, check these items:

– The malfunction indicator lamp (MIL) has not been

reported on, and there are no DTCs.

– Ignition timing
– Spark plugs
– Air cleaner
– PCV system

• Apply the parking brake, and make sure the

headlights are off.

1. Disconnect the evaporative emission (EVAP)

canister purge valve connector (see step 5 on page
11-409).

2. Connect the HDS to the data link connector (DLC)

(A) located under the driver’s side of the dashboard.

3. Make sure the HDS communicates with the ECM/

PCM. If it doesn’t, go to the DLC circuit
troubleshooting (see page 11-204).

Wire side of female terminals

Terminal side of female terminals

Is ther e continuity?

08/08/21 14:29:38 61SNR030_110_0309

02

03

01

SNR9A00A20336100000MAAT00

YES

NO

11-309

11-309

Idle Speed Inspection

BRAKE PEDAL POSITION SWITCH
4P CONNECTOR

BKSW
(LT GRN)

JUMPER WIRE

ECM/PCM CONNECTOR A (44P)

BKSW (LT GRN)

A

9. Connect brake pedal position switch 4P connector

terminal No. 2 to body ground with a jumper wire.

10. Check for continuity between ECM/PCM connector

terminal A40 and body ground.

Repair open in the wire between the brake

pedal position switch and the No. 12 HORN/STOP
(15 A) fuse. Also, inspect the brake pedal position
switch (see page 19-6).

Repair open in the wire between the ECM/

PCM (A40) and the brake pedal position switch.

NOTE:

• Before checking the idle speed, check these items:

– The malfunction indicator lamp (MIL) has not been

reported on, and there are no DTCs.

– Ignition timing
– Spark plugs
– Air cleaner
– PCV system

• Apply the parking brake, and make sure the

headlights are off.

1. Disconnect the evaporative emission (EVAP)

canister purge valve connector (see step 5 on page
11-409).

2. Connect the HDS to the data link connector (DLC)

(A) located under the driver’s side of the dashboard.

3. Make sure the HDS communicates with the ECM/

PCM. If it doesn’t, go to the DLC circuit
troubleshooting (see page 11-204).

Wire side of female terminals

Terminal side of female terminals

Is ther e continuity?

08/08/21 14:29:38 61SNR030_110_0309

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