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Honda Ridgeline. Manual - part 141

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−

DTC P0401:

YES

11-328

EGR System

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 ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at

3,000 rpm without load (in Park or 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 158 °F (70 °C)

• Transmission in D position
• Vehicle speed at 25 mph (40 km/h) or more, and

engine speed between 1,100 rpm and 3,000 rpm

• 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 intake manifold cover (see step

1 on page 9-3), clean the intake manifold, and EGR
ports 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. 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 OFF.

8. Replace the EGR valve (see page 11-342).

9. Turn the ignition switch ON (II).

10. Reset the PCM with the HDS.

11. Do the PCM idle learn procedure (see page 11-273).

12. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 158 °F (70 °C)

• Transmission in D position
• Vehicle speed at 25 mph (40 km/h) or more, and

engine speed between 1,100 rpm and 3,000 rpm

• 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 PCM, then 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 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?

−

YES

11-329

15. Update the PCM if it does not have the latest

software (see page 11-7), or substitute a known-
good PCM (see page 11-8).

16. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 158 °F (70 °C)

• Transmission in D position
• Vehicle speed at 25 mph (40 km/h) or more, and

engine speed between 1,100 rpm and 3,000 rpm

• 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 PCM. If the PCM
was updated, substitute a known-good PCM
(see page 11-8), then go to step 16. If the 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 PCM was updated, troubleshooting is

complete. If the PCM was substituted, replace the
original PCM (see page 11-205). 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 PCM. If the PCM was updated, substitute a
known-good PCM (see page 11-8), then go to step
16. If the PCM was substituted, go to step 1. If the
screen indicates NOT COMPLETED, go to step 16.

Is DT C P0401 indicated?

Does the scr een indicate PASSED?

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−

DTC P0404:

YES

11-330

EGR System

DTC Troubleshooting (cont’d)

EGR VALVE 6P CONNECTOR

SG2

EGRP

EGR VALVE 6P CONNECTOR

VCC2

EGRP

EGR VALVE 6P CONNECTOR

PG1 (BLK)

EGR Control 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 ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at

3,000 rpm without load (in Park or 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 OFF.

6. Disconnect the EGR valve 6P connector.

7. At the sensor side, measure resistance between

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

Go to step 25.

Go to step 8.

8. At the EGR valve side, measure 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, then go to step 26.

Terminal side of male terminals

Wire side of female terminals

Is the r esult OK ?

Is ther e 100 k

or mor e?

Is ther e 100 k

or mor e?

Is ther e continuity?

０４

０５

−

YES

11-331

PCM CONNECTOR C (44P)

EGR
(BLU/RED)

PCM CONNECTOR C (44P)

EGR (BLU/RED)

EGR VALVE 6P CONNECTOR

EGR (BLU/RED)

10. Jump the SCS line with the HDS.

11. Disconnect PCM connector C (44P).

12. Check for continuity between PCM connector

terminal C9 and body ground.

Repair short in the wire between the PCM

(C9) and the EGR valve, then go to step 26.

Go to step 13.

13. Check for continuity between PCM connector

terminal C9 and EGR valve 6P connector terminal
No. 4.

Go to step 14.

Repair open in the wire between the PCM (C9)

and the EGR valve, then go to step 26.

14. Remove the EGR valve (see page 11-342).

15. Clean the intake manifold EGR port and the

passage inside the EGR valve with throttle plate
and induction cleaner.

16. Install the EGR valve (see page 11-342).

17. Reconnect the EGR valve 6P connector.

18. Reconnect PCM connector C (44P).

19. Turn the ignition switch ON (II).

20. Reset the PCM with the HDS.

21. Do the PCM idle learn procedure (see page 11-273).

22. Start the engine. Hold the engine speed at

3,000 rpm without load (in Park or 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 OFF.

25. Replace the EGR valve (see page 11-342).

26. Reconnect all connectors.

27. Turn the ignition switch ON (II).

28. Reset the PCM with the HDS.

29. Do the PCM idle learn procedure (see page 11-273).

30. Start the engine. Hold the engine speed at

3,000 rpm without load (in Park or neutral) until the
radiator fan comes on, then let it idle.

31. Do the EGR TEST in the INSPECTION MENU with

the HDS.

(cont’d)

Terminal side of female terminals

Wire side of
female terminals

Terminal side of female terminals

Is ther e continuity?

Is the r esult OK ?

Content .. 139 140 141 142 ..