Nissan Frontier D22. Manual - part 444

DTC P0400 EGR FUNCTION

EC-879

[VG33E]

C

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EC

Wiring Diagram

UBS00DK2

BBWA0504E

EC-880

[VG33E]

DTC P0400 EGR FUNCTION

Diagnostic Procedure

UBS00DK3

1. 

CHECK EXHAUST GAS LEAK

1.

Start engine and run it at idle.

2.

Listen for an exhaust gas leak before three way catalyst (manifold).

OK or NG

OK (With CONSULT-II)>>GO TO 2.
OK (Without CONSULT-II)>>GO TO 3.
NG

>> Repair or replace.

2. 

CHECK VACUUM SOURCE TO EGR VALVE

 With CONSULT-II

1.

Warm engine up to normal operating temperature.

2.

Disconnect vacuum hose to EGR valve.

3.

Check for vacuum existence at idle.

4.

Select  “EGRC SOLENOID VALVE” in “ACTIVE TEST” mode
with CONSULT-II and turn the solenoid valve ON.

5.

Check for vacuum existence when revving engine from idle up
to 3,000rpm.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 5.

SEC502D

Vacuum should not exist at idle.

AEC648A

Vacuum should exist when revving engine.

SEF129Y

DTC P0400 EGR FUNCTION

EC-881

[VG33E]

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EC

3. 

CHECK VACUUM SOURCE TO EGR VALVE

 Without CONSULT-II

1.

Warm engine up to normal operating temperature.

2.

Disconnect vacuum hose to EGR valve.

3.

Check for vacuum existence at idle.

4.

Check for vacuum existence when revving engine from idle up
to 3,000 rpm quickly.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 5.

4. 

CHECK EGR VALVE

Refer to 

EC-883, "Component Inspection"

 .

OK or NG

OK

>> GO TO 11.

NG

>> Replace EGR valve.

5. 

CHECK VACUUM HOSE

1.

Turn ignition switch OFF.

2.

Check vacuum hose for clogging, cracks or improper connec-
tion.

OK or NG

OK (With CONSULT-II)>>GO TO 6.
OK (Without CONSULT-II)>>GO TO 7.
NG

>> Repair or replace vacuum hose.

6. 

CHECK EGRC-SOLENOID VALVE OPERATION

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Turn EGRC-solenoid valve “ON” and “OFF” in “ACTIVE TEST”
mode with CONSULT-II and check operating sound.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace EGRC-solenoid valve or repair circuit.

Vacuum should not exist at idle.

Vacuum should exist when revving engine.

AEC648A

SEF109L

Clicking noise should be heard.

SEF129Y

EC-882

[VG33E]

DTC P0400 EGR FUNCTION

7. 

CHECK EGRC-SOLENOID VALVE OPERATION

 Without CONSULT-II

1.

Disconnect ECM harness connector.

2.

Turn ignition switch ON.

3.

Connect a suitable jumper wire between ECM terminal 103 and engine ground.

4.

Check operating sound of EGRC-solenoid valve when disconnecting and connecting the jumper wire.

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace EGRC-solenoid valve or repair circuit.

8. 

CHECK EGRC-SOLENOID VALVE

1.

Perform 

″EGRC SOLENOID VALVE″ in ″ACTIVE TEST″ mode.

2.

Check air passage continuity and operation delay time under the
following conditions.

OK or NG

OK

>> GO TO 10.

NG

>> Repair EGRC-solenoid valve.

9. 

CHECK EGRC-SOLENOID VALVE

1.

Check air passage continuity and operation delay time under the
following conditions.

OK or NG

OK

>> GO TO 10.

NG

>> Repair EGRC-solenoid valve.

10. 

CHECK EGRC-BPT VALVE

Refer to 

EC-883, "Component Inspection"

 .

OK or NG

OK

>> GO TO 11. 

NG

>> Replace EGRC-BPT valve.

11. 

CHECK EGR TEMPERATURE SENSOR

Refer to 

EC-895, "Component Inspection"

 .

OK or NG

OK

>> GO TO 12.

NG

>> Replace EGR temperature sensor.

Clicking noise should be heard.

Conditions

Air passage continuity 

between A and B

Air passage continuity 

between A and C

ON

Yes

No

OFF

No

Yes

SEF129Y

Conditions

Air passage continuity 

between A and B

Air passage continuity 

between A and C

12V direct current supply 
between terminals 1 and 
2

Yes

No

No supply

No

Yes

AEC919