Acura CSX. Instruction — page 172

*01

SNR9AEAA20323500000DAAT00

11-356

EGR System

Component Location Index

ENGINE CONTROL MODULE (ECM)/
POWERTRAIN CONTROL MODULE (PCM)

EXHAUST GAS RECIRCULATION (EGR) PLATE

EXHAUST GAS RECIRCULATION (EGR) VALVE

Update, page 11-227
Substitution, page 11-7
Replacement, page 11-228

Replacement, page 9-2

Replacement. page 11-370

08/08/21 14:31:15 61SNR030_110_0356

SNR9AA8K72100090401FAAT30

DTC P0401:

YES

NO

YES

NO

YES

NO

YES

NO

11-357

DTC Troubleshooting

EGR Insufficient Flow

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.

Go to step 5.

Go to step 7.

5. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• A/T in D, M/T in 4th
• Drive at a steady speed between 88

120 km/h

(55

75 mph) for at least 10 seconds

• During the drive, decelerate (with the throttle

fully closed) for 5 seconds

6. Monitor the OBD STATUS for DTC P0401 in the

DTCs MENU with the HDS.

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

clean the intake manifold port with throttle plate
and induction cleaner, then go to step 9.

If the screen indicates PASSED, intermittent

failure, the system is OK at this time. Check for
poor connections or loose terminals at the EGR
valve 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 5 and recheck.

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

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

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

10. Reset the ECM/PCM with the HDS.

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

11-310).

12. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• A/T in D, M/T in 4th
• Drive at a steady speed between 88

120 km/h

(55

75 mph) for at least 10 seconds

• During the drive, decelerate (with the throttle

fully closed) for 5 seconds

13. 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
connections are OK, go to step 15.

Go to step 14.

14. Monitor the OBD STATUS for DTC P0401 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 EGR valve
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 12.

Is the r esult OK ?

Does the scr een indicate F AILED?

Is DT C P0401 indicated?

Does the scr een indicate PASSED?

08/08/21 14:31:15 61SNR030_110_0357

01

SNR9AA8K72100090404FAAT30

YES

NO

YES

NO

YES

NO

YES

NO

DTC P0404:

11-358

11-358

EGR System

EGR VALVE 6P CONNECTOR

SG2

EGRP

15. 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).

16. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• A/T in D, M/T in 4th
• Drive at a steady speed between 88

120 km/h

(55

75 mph) for at least 10 seconds

• During the drive, decelerate (with the throttle

fully closed) for 5 seconds

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. If the
ECM/PCM was updated, substitute a known-good
ECM/PCM (see page 11-7), then go to step 16. If the
ECM/PCM was substituted, go to step 1.

Go to step 18.

18. Monitor the OBD STATUS for DTC P0401 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 17, 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 16. If the ECM/PCM was substituted,
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 16.

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. Clean any carbon build-up on the EGR valve
with throttle plate and induction cleaner.

Go to step 5.

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

6. Disconnect the EGR valve 6P connector.

7. At the EGR valve side, measure the resistance

between EGR valve 6P connector terminals No. 1
and No. 2.

Go to step 25.

Go to step 8.

EGR Valve Circuit Range/

Performance Problem

Terminal side of male terminals

Is DT Cs P0401 indicated?

Does the scr een indicate PASSED?

Is the r esult OK ?

Is ther e 100 k

or mor e?

08/08/21 14:31:16 61SNR030_110_0358

02

*01

04

05

YES

NO

YES

NO

YES

NO

YES

NO

11-359

EGR VALVE 6P CONNECTOR

VCC2

EGRP

EGR VALVE 6P CONNECTOR

PG2 (BLK/RED)

(BLK) *

*: ’07-09 models

ECM/PCM CONNECTOR B (44P)

EGR (BLU/RED)

ECM/PCM CONNECTOR B (44P)

EGR (BLU/RED)

EGR VALVE 6P CONNECTOR

EGR (BLU/RED)

8. At the EGR valve side, measure the resistance

between EGR valve 6P connector terminals No. 1
and No. 3.

Go to step 25.

Go to step 9.

9. Check for continuity between EGR valve 6P

connector terminal No. 6 and body ground.

Go to step 10.

Repair open in the wire between the EGR

valve and G101; A/T model (see page 22-16), M/T
model (see page 22-18), then go to step 26.

10. Jump the SCS line with the HDS.

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

12. Check for continuity between ECM/PCM connector

terminal B2 and body ground.

Repair short in the wire between the ECM/

PCM (B2) and the EGR valve, then go to step 26.

Go to step 13.

13. Check for continuity between ECM/PCM connector

terminal B2 and EGR valve 6P connector terminal
No. 4.

Go to step 14.

Repair open in the wire between the ECM/

PCM (B2) and the EGR valve, then go to step 26.

Terminal side of male terminals

Wire side of female terminals

Terminal side of female terminals

Wire side of
female terminals

Terminal side of female terminals

Is ther e 100 k

or mor e?

Is ther e continuity?

Is ther e continuity?

Is ther e continuity?

08/08/21 14:31:16 61SNR030_110_0359

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