Acura CSX. Manual — part 159
06
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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
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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
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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
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−
−
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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