Nissan Frontier D22. Manual - part 294

DTC P0400 EGR FUNCTION

EC-279

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6.

Accelerate vehicle to a speed of 40 km/h (25 MPH) once and
then stop vehicle with engine running.
If “COMPLETED” appears on CONSULT-II screen, go to step 9.
If “COMPLETED” does not appear on CONSULT-II screen, go to
the following step.

7.

Check the output voltage of “THRTL POS SEN” (at closed throt-
tle position) and note it.

8.

When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions until
“TESTING” changes to “COMPLETED”. (It will take approxi-
mately 30 seconds or more.)

If “TESTING” is not displayed after 5 minutes, retry from step 2.

9.

Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to 

EC-282, "Diagnostic Procedure"

 .

SEF235Y

ENG SPEED

2,000 - 2,800 rpm

Vehicle speed

10 km/h (6 MPH) or more

B/FUEL SCHDL

7.0 - 10.0 msec

THRTL POS SEN

(X + 0.23) 

− (X + 0.74) V

X = Voltage value measured at step 7

Selector lever

Suitable position

SEF192Y

EC-280

[KA24DE]

DTC P0400 EGR FUNCTION

Overall Function Check

UBS00D6L

Use this procedure to check the overall EGR function. During this check, a 1st trip DTC might not be con-
firmed.

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Disconnect EGRC solenoid valve harness connector. (The 1st
trip DTC for EGRC solenoid valve will be displayed, however,
ignore it.)

3.

Check the EGR valve lifting when revving engine from 2,000 rpm to 4,000 rpm quickly under no load using
the following methods.

If NG, go to 

EC-282, "Diagnostic Procedure"

 .

If OK, go to the next step.

4.

Check voltage between ECM terminal 63 (EGR temperature
sensor signal) and ground at idle speed.
Less than 4.5V should exist.
If NG, go to next step.

5.

Turn ignition switch OFF.

6.

Check harness continuity between EGR temperature sensor
harness connector terminal 2 and ECM terminal 43 (ECM
ground).

7.

Check  “EGR TEMPERATURE SENSOR”. Refer to 

EC-285,

"Component Inspection"

 .

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EGR valve should lift up and down without sticking.

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Continuity should exist.

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DTC P0400 EGR FUNCTION

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Wiring Diagram

UBS00D6M

BBWA0453E

EC-282

[KA24DE]

DTC P0400 EGR FUNCTION

Diagnostic Procedure

UBS00D6N

1. 

CHECK EXHAUST SYSTEM

1.

 Start engine.

2.

Check exhaust pipes and muffler for leaks.

OK or NG

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

>> Repair or replace exhaust system.

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.
Vacuum should not exist at idle.

4.

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

5.

Check for vacuum existence when revving engine from 2,000
rpm up to 4,000 rpm.
Vacuum should exist when revving engine.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 5.

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SEF337V

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