Acura CSX. Instruction — page 127

SNR9AA7K72100092A00FAAT30

SNR9AA7K72100092610FAAT00

DTC P2610:

DTC P2A00:

YES

NO

YES

NO

YES

NO

11-182

11-182

PGM-FI System

ECM/PCM Ignition Off Internal

Timer Malfunction

A/F Sensor (Sensor 1) Circuit

Range/Performance Problem

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

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

2. Clear the DTC with the HDS.

3. Check for Temporary DTCs or DTCs with the HDS.

Go to step 4.

Intermittent failure, the system is OK at this

time.

4. 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).

5. Check for Temporary DTCs or DTCs with the HDS.

If the ECM/PCM was updated, substitute a

known-good ECM/PCM (see page 11-7), then
recheck. If the ECM/PCM was substituted, go to
step 1.

If the ECM/PCM was updated, troubleshooting

is complete. If the ECM/PCM was substituted,
replace the original ECM/PCM (see page 11-228). If
any other Temporary DTCs or DTCs are indicated,
go to the indicated DTC’s troubleshooting.

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

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

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at

3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.

4. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• A/T in D, M/T in 3rd
• Vehicle speed between 44

88 km/h

(22

55 mph) for 5 minutes

• Drive at a steady speed between 88

120 km/h

(55

75 mph) for 10 seconds, then decelerate

(with the throttle fully closed) for 5 seconds

5. Monitor the OBD STATUS for DTC P2A00 in the

DTCs MENU with the HDS.

Go to step 6.

If the screen indicates PASSED, intermittent

failure, the system is OK at this time. Check for
poor connections or loose terminals at the A/F
sensor (Sensor 1) and the ECM/PCM. If the screen
indicates EXECUTING, keep driving until a result
comes on. If the screen indicates OUT OF
CONDITION, go to step 3 and recheck.

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

7. Replace the A/F sensor (Sensor 1) (see page

11-221).

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

9. Reset the ECM/PCM with the HDS.

Is DT C P2610 indicated?

Is DT C P2610 indicated?

Does the scr een indicate F AILED?

08/08/21 14:21:46 61SNR030_110_0182

SNR9AA7K721000U0028FAAT00

YES

NO

YES

NO

YES

NO

YES

NO

DTC U0028:

11-183

11-183

10. Do the ECM/PCM idle learn procedure (see page

11-310).

11. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• A/T in D, M/T in 3rd
• Vehicle speed between 44

88 km/h

(22

55 mph) for 5 minutes

• Drive at a steady speed between 88

120 km/h

(55

75 mph) for 10 seconds, then decelerate

(with the throttle fully closed) for 5 seconds

12. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the A/F sensor (Sensor 1) and the ECM/
PCM, then go to step 1.

Go to step 13.

13. Monitor the OBD STATUS for DTC P2A00 in the

DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 12,
go to the indicated DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at the A/F sensor
(Sensor 1) and the ECM/PCM, then go to step 1. If
the screen indicates EXECUTING, keep driving until
a result comes on. If the screen indicates OUT OF
CONDITION, go to step 11.

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

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

2. Clear the DTC with the HDS.

3. Check for Temporary DTCs or DTCs with the HDS.

Go to step 4.

Intermittent failure, the system is OK at this

time.

4. 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).

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

6. Check for Temporary DTCs or DTCs with the HDS.

If the ECM/PCM was updated, substitute a

known-good ECM/PCM (see page 11-7), then
recheck. If the ECM/PCM was substituted, go to
step 1.

If the ECM/PCM was updated, troubleshooting

is complete. If the ECM/PCM was substituted,
replace the original ECM/PCM (see page 11-228). If
any other Temporary DTCs or DTCs are indicated,
go to the indicated DTC’s troubleshooting.

F-CAN Malfunction (BUS-OFF

(ECM/PCM))

Is DT C P2A00 indicated?

Does the scr een indicate PASSED?

Is DT C U0028 indicated?

Is DT C P0028 indicated?

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01

SNR9AA7K721000U0122FAAT00

DTC U0122:

YES

NO

YES

NO

YES

NO

YES

NO

11-184

PGM-FI System

CANH (WHT)

CANH (WHT)

ECM/PCM CONNECTOR A (44P)

VSA MODULATOR-CONTROL
UNIT 37P CONNECTOR

F-CAN Malfunction (ECM/PCM-

VSA Modulator-Control Unit)

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

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

2. Check for Temporary DTCs or DTCs with the HDS.

Go to the troubleshooting for DTC U0028.

Go to step 3.

3. Clear the DTC with the HDS.

4. Check for Temporary DTCs or DTCs with the HDS.

Go to step 5.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the VSA modulator-control unit and the ECM/
PCM.

5. Check for communication to the VSA system with

the HDS.

Go to step 6.

Go to the DLC circuit troubleshooting

(see page 11-204).

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

7. Jump the SCS line with the HDS.

8. Disconnect the VSA modulator-control unit 37P

connector (see page 19-171).

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

10. Check for continuity between ECM/PCM connector

terminal A36 and VSA modulator-control unit 37P
connector terminal No. 15.

Go to step 11.

Repair open in the wire between the ECM/

PCM (A36) and the VSA modulator-control unit,
then go to step 12.

Terminal side of female terminals

Wire side of female terminals

Ar e DT C U0028 and U0122 indicated at the same
time?

Is DT C U0122 indicated?

Does the HDS communicate with the V SA
modulator -contr ol unit?

Is ther e continuity?

08/08/21 14:21:46 61SNR030_110_0184

02

YES

NO

YES

NO

11-185

CANL (RED)

CANL (RED)

VSA MODULATOR-CONTROL
UNIT 37P CONNECTOR

ECM/PCM CONNECTOR A (44P)

11. Check for continuity between ECM/PCM connector

terminal A37 and VSA modulator-control unit 37P
connector terminal No. 1.

Substitute a known-good VSA modulator-

control unit (see page 19-171), then go to step 12
and recheck. If DTC U0122 is not indicated, replace
the original VSA modulator-control unit (see page
19-171), then go to step 12.

Repair open in the wire between the ECM/

PCM (A37) and the VSA modulator-control unit,
then go to step 12.

12. Reconnect all connectors.

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

14. Reset the ECM/PCM with the HDS.

15. Do the ECM/PCM idle learn procedure (see page

11-310).

16. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the VSA modulator-control unit and
the ECM/PCM, then go to step 1.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs are indicated, go to the
indicated DTC’s troubleshooting.

Wire side of female terminals

Terminal side of female terminals

Is ther e continuity?

Is DT C U0122 indicated?

08/08/21 14:21:47 61SNR030_110_0185

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