Acura CSX. Instruction — page 126

01

SNR9AA7K72100092238FAAT00

DTC P2238:

YES

NO

YES

NO

YES

NO

11-178

PGM-FI System

ECM/PCM CONNECTOR C (44P)

AFS

(RED)

A/F Sensor (Sensor 1) AFS

Circuit Low Voltage

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. Check for poor connections or loose terminals
at the A/F sensor (Sensor 1) and the ECM/PCM.

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

5. Jump the SCS line with the HDS.

6. Disconnect the A/F sensor (Sensor 1) 4P connector.

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

8. Check for continuity between ECM/PCM connector

terminal C29 and body ground.

Repair short in the wire between the ECM/

PCM (C29) and the A/F sensor (Sensor 1), then go to
step 10.

Go to step 9.

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

11-221).

10. Reconnect all connectors.

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

12. Reset the ECM/PCM with the HDS.

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

11-310).

14. 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. If the connector and
terminal fits are OK, go to step 16.

Go to step 15.

Terminal side of female terminals

Is DT C P2238 indicated?

Is ther e continuity?

Is DT C P2238 indicated?

08/08/21 14:20:28 61SNR030_110_0178

SNR9AA7K72100092252FAAT00

YES

NO

YES

NO

YES

NO

YES

NO

DTC P2252:

11-179

11-179

15. Monitor the OBD STATUS for DTC P2238 in the

DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 14,
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 NOT COMPLETED, keep idling
until a result comes on.

16. 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).

17. Start the engine, and let it idle.

18. 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 go to
step 17. If the ECM/PCM was substituted, go to step
1.

Go to step 19.

19. Monitor the OBD STATUS for DTC P2238 in the

DTCs MENU with the HDS.

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 were indicated in step 18, go to the indicated
DTC’s troubleshooting.

If the screen indicates FAILED, go to step 1. If

the ECM/PCM was updated, substitute a known-
good ECM/PCM (see page 11-7), then go to step 17.
If the ECM/PCM was substituted, go to step 1. If the
screen indicates NOT COMPLETED, keep idling
until a result comes on.

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.

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 A/F sensor (Sensor 1) and the ECM/PCM.

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

6. Jump the SCS line with the HDS.

7. Disconnect the A/F sensor (Sensor 1) 4P connector.

8. Disconnect ECM/PCM connector C (44P).

A/F Sensor (Sensor 1) AFS

Circuit Low Voltage

Does the scr een indicate PASSED?

Is DT C P2238 indicated?

Does the scr een indicate PASSED?

Is DT C P2252 indicated?

08/08/21 14:20:28 61SNR030_110_0179

01

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

11-180

PGM-FI System

ECM/PCM CONNECTOR C (44P)

AFS

(RED/YEL)

9. Check for continuity between ECM/PCM connector

terminal C30 and body ground.

Repair short in the wire between the ECM/

PCM (C30) and the A/F sensor (Sensor 1), then go to
step 11.

Go to step 10.

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

11-221).

11. Reconnect all connectors.

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

13. Reset the ECM/PCM with the HDS.

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

11-310).

15. 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. If the connections and the
terminals fits are OK, go to step 17.

Go to step 16.

16. Monitor the OBD STATUS for DTC P2252 in the

DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 15,
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 NOT COMPLETED, keep idling
until a result comes on.

17. 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).

18. Start the engine, and let it idle.

19. 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 go to
step 18. If the ECM/PCM was substituted, go to step
1.

Go to step 20.

20. Monitor the OBD STATUS for DTC P2252 in the

DTCs MENU with the HDS.

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 were indicated in step 19, go to the indicated
DTC’s troubleshooting.

If the screen indicates FAILED, go to step 1. If

the ECM/PCM was updated, substitute a known-
good ECM/PCM (see page 11-7), then go to step 18.
If the ECM/PCM was substituted, go to step 1. If the
screen indicates NOT COMPLETED, keep idling
until a result comes on.

Terminal side of female terminals

Is ther e continuity?

Is DT C P2252 indicated?

Does the scr een indicate PASSED?

Is DT C P2252 indicated?

Does the scr een indicate PASSED?

08/08/21 14:20:29 61SNR030_110_0180

SNR9AA7K72100092270FAAT00

DTC P2270:

DTC P2271:

YES

NO

YES

NO

YES

NO

11-181

Secondary HO2S (Sensor 2)

Circuit Signal Stuck Lean

Secondary HO2S (Sensor 2)

Circuit Signal Stuck Rich

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, and let it idle without load (A/T in

P or N, M/T in neutral) until the radiator fan comes
on.

4. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• Vehicle speed at 56 km/h (35 mph) or more for

1 minute

5. Monitor the OBD STATUS for DTC P2270 or P2271

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
secondary HO2S (Sensor 2) 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 secondary HO2S (Sensor 2) (see page

11-221).

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

9. Reset the ECM/PCM with the HDS.

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

11-310).

11. Start the engine, and let it idle without load (A/T in

P or N, M/T in neutral) until the radiator fan comes
on.

12. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• Vehicle speed at 56 km/h (35 mph) or more for

1 minute

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

Check for poor connections or loose

terminals at the secondary HO2S (Sensor 2) and
the ECM/PCM, then go to step 1.

Go to step 14.

14. Monitor the OBD STATUS for DTC P2270 or P2271

in the DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 13,
go to the indicated DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at the secondary
HO2S (Sensor 2) 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.

Does the scr een indicate F AILED?

Is DT C P227 0 or P227 1 indicated?

Does the scr een indicate PASSED?

08/08/21 14:21:46 61SNR030_110_0181

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