Acura CSX. Manual — part 172
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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
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SNR9AA8K72100090401FAAT30
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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?
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SNR9AA8K72100090404FAAT30
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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?
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04
05
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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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