Acura CSX. Instruction — page 173

YES

NO

YES

NO

YES

NO

11-360

EGR System

14. Remove the EGR valve (see page 11-370).

15. Remove the EGR plate (see page 9-2), and clean the

intake manifold EGR port with throttle plate and
induction cleaner. Also, clean the passage inside
the EGR valve with throttle plate and induction
cleaner.

16. Install the EGR valve (see page 11-370).

17. Reconnect the EGR valve 6P connector.

18. Reconnect ECM/PCM connector B (44P).

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

20. Reset the ECM/PCM with the HDS.

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

11-310).

22. 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.

23. Do the EGR TEST in the INSPECTION MENU with

the HDS.

Go to step 32.

Go to step 24.

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

25. Replace the EGR valve (see page 11-370).

26. Reconnect all connectors.

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

28. Reset the ECM/PCM with the HDS.

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

11-310).

30. 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.

31. Do the EGR TEST in the INSPECTION MENU with

the HDS.

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

Check for poor connections or loose

terminals at the EGR valve and the ECM/PCM, then
go to step 1. If the connections and terminals are
OK, go to step 34.

Go to step 33.

33. Monitor the OBD STATUS for DTC P0404 in the

DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 32,
go to the indicated DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at the EGR valve
and the ECM/PCM, then go to step 1. If the screen
indicates EXECUTING, keep idling until a result
comes on. If the screen indicates OUT OF
CONDITION, go to step 30.

Is the r esult OK ?

Is DT C P0404 indicated?

Does the scr een indicate PASSED?

08/08/21 14:31:17 61SNR030_110_0360

01

SNR9AA8K72100090406FAAT30

YES

NO

YES

NO

YES

NO

YES

NO

DTC P0406:

11-361

11-361

EGR VALVE 6P CONNECTOR

VCC2 (YEL/BLU)

SG2 (GRN/BLK)

34. 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).

35. Start the engine. Hold the engine speed at

3000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.

36. Do the EGR TEST in the INSPECTION MENU with

the HDS.

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

Check for poor connections or loose

terminals at the EGR valve and the ECM/PCM. If the
ECM/PCM was updated, substitute a known-good
ECM/PCM (see page 11-7), then go to step 35. If the
ECM/PCM was substituted, go to step 1.

Go to step 38.

38. Monitor the OBD STATUS for DTC P0404 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 37, go to the indicated
DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at the EGR valve
and the ECM/PCM. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see page 11-7),
then go to step 35. If the ECM/PCM was substituted,
go to step 1. If the screen indicates EXECUTING,
keep idling until a result comes on. If the screen
indicates OUT OF CONDITION, go to step 35.

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 EGR VLS in the DATA LIST with the HDS.

Go to step 3.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the EGR valve and the ECM/PCM.

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

4. Disconnect EGR valve 6P connector.

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

6. Measure the voltage between EGR valve 6P

connector terminals No. 2 and No. 3.

Go to step 11.

Go to step 7.

EGR Valve Position Sensor

Circuit High Voltage

Wire side of female terminals

Is DT Cs P0404 indicated?

Does the scr een indicate PASSED?

Is 4.88 V or mor e indicated?

Is ther e about 5 V ?

08/08/21 14:32:24 61SNR030_110_0361

02

YES

NO

YES

NO

YES

NO

11-362

EGR System

ECM/PCM CONNECTOR B (44P)

EGR VALVE 6P CONNECTOR

SG2 (GRN/BLK)

SG2 (GRN/BLK)

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

8. Jump the SCS line with the HDS.

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

10. Check for continuity between EGR valve 6P

connector terminal No. 2 and ECM/PCM connector
terminal B33.

Go to step 18.

Repair open in the wire between the ECM/

PCM (B33) and the EGR valve, then go to step 13.

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

12. Replace the EGR valve (see page 11-370).

13. Reconnect all connectors.

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

15. Reset the ECM/PCM with the HDS.

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

11-310).

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

Check for poor connections or loose

terminals at the EGR valve 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.

18. Reconnect all connectors.

19. 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).

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

Check for poor connections or loose

terminals at the EGR valve and the ECM/PCM. 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.

Wire side of female terminals

Terminal side of female terminals

Is ther e continuity?

Is DT C P0406 indicated?

Is DT C P0406 indicated?

08/08/21 14:32:24 61SNR030_110_0362

01

SNR9AA8K72100092413FAAT30

DTC P2413:

YES

NO

YES

NO

YES

NO

11-363

EGR VALVE 6P CONNECTOR

VCC2 (YEL/BLU)

EGR System Malfunction

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. Do the EGR TEST in the INSPECTION MENU with

the HDS.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the EGR valve and the ECM/PCM.

Go to step 5.

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

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

7. Check the EGR VLS in the DATA LIST with the HDS.

Go to step 8.

Go to step 21.

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

9. Disconnect the EGR valve 6P connector.

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

11. Measure the voltage between EGR valve 6P

connector terminal No. 3 and body ground.

Go to step 16.

Go to step 12.

Wire side of female terminals

Is the r esult OK ?

Is about 0 V indicated?

Is ther e about 5 V ?

08/08/21 14:32:24 61SNR030_110_0363

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