Nissan Frontier D22. Manual - part 297

DTC P0402 EGRC-BPT VALVE FUNCTION

EC-291

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EC

8. 

CHECK EGR VALVE

Refer to 

EC-291, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace EGR valve.

9. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00D6V

EGRC-BPT VALVE

1.

Plug one of two ports of EGRC-BPT valve.

2.

Vacuum from the other port and check leakage without applying any pressure from under EGR-BPT
valve.
Leakage should exist.

MASS AIR FLOW SENSOR

1.

Turn ignition switch ON.

2.

Start engine and warm it up to normal operating temperature. 

3.

Check voltage between ECM terminal 54 (mass air flow sensor
signal) and ground.

*: Check for linear voltage rise in response to increases to about 4,000 rpm in
engine speed.

4.

If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it
again. Repeat above check.

SEF172P

Conditions

Voltage [V]

Ignition switch ON (Engine stopped.)

Less than 1.0

Idle (Engine is warmed-up to normal operating 
temperature.)

0.9 - 1.8

2,500 rpm (Engine is warmed-up to normal 
operating temperature.)

1.9 - 2.3

Idle to about 4,000 rpm*

1.3 - 1.7 to Approx. 3.0

SEF326V

EC-292

[KA24DE]

DTC P0402 EGRC-BPT VALVE FUNCTION

5.

If NG, remove mass air flow sensor from air duct. Check hot wire
for damage or dust.

EGRC SOLENOID VALVE

 With CONSULT-II

Check air passage continuity.
Perform “EGRC SOLENOID VALVE” in “ACTIVE TEST” mode.

 Without CONSULT-II

Check air passage continuity shown in the figure.

EGR VALVE

●

Apply vacuum to EGR vacuum port with a hand vacuum pump.
EGR valve spring should lift.

●

Check for sticking.

SEF893J

LEC036A

LEC037A

MEF137D

DTC P0405, P0406 EGRT SENSOR

EC-293

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DTC P0405, P0406 EGRT SENSOR

PFP:14710

Component Description

UBS00D6W

The EGR temperature sensor detects temperature changes in the
EGR passageway. When the EGR valve opens, hot exhaust gases
flow, and the temperature in the passageway changes. The EGR
temperature sensor is a thermistor that modifies a voltage signal
sent from the ECM. This modified signal then returns to the ECM as
an input signal. As the temperature increases, EGR temperature
sensor resistance decreases. This sensor is not used to control the
engine system.
It is used only for the on board diagnosis.

<Reference data>

*: These data are reference values and are measured between ECM terminal 63
(EGR temperature sensor) and ground.
When EGR system is operating.
Voltage: 0 - 1.5V

On Board Diagnosis Logic

UBS00D6X

SEF599K

EGR temperature

°C (°F)

Voltage*

 V

Resistance

M

Ω

0 (32)

4.56

0.62 - 1.05

50 (122)

2.25

0.065 - 0.094

100 (212)

0.59

0.011 - 0.015

SEF068XB

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P0405

EGR temperature sensor 
circuit low input

A)

An excessively low voltage from the EGR 
temperature sensor is sent to ECM even 
when engine coolant temperature is low.

●

Harness or connectors
(The EGR temperature sensor circuit is 
shorted.)

●

EGR temperature sensor

●

Malfunction of EGR function, EGRC-BPT 
valve or EGRC-solenoid valve

P0406

EGR temperature sensor 
circuit high input

B)

An excessively high voltage from the EGR 
temperature sensor is sent to ECM even 
when engine coolant temperature is high.

●

Harness or connectors
(The EGR temperature sensor circuit is 
open.)

●

EGR temperature sensor

●

Malfunction of EGR function, EGRC-BPT 
valve or EGRC-solenoid valve

EC-294

[KA24DE]

DTC P0405, P0406 EGRT SENSOR

DTC Confirmation Procedure

UBS00D6Y

Perform “PROCEDURE FOR MALFUNCTION A” first. If 1st trip DTC cannot be confirmed, perform
“PROCEDURE FOR MALFUNCTION B”.

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 5 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Verify that engine coolant temperature is less than 50

°C

(122

°F).

If the engine coolant temperature is above the range, cool
the engine down.

4.

Start engine and let it idle for at least 8 seconds.

5.

If 1st trip DTC is detected, go to 

EC-297, "Diagnostic Procedure"

.

 With GST

●

Follow the procedure “With CONSULT-II”.

PROCEDURE FOR MALFUNCTION B

CAUTION:

Always drive vehicle at a safe speed.
TESTING CONDITION:
Always perform the test at a temperature above 5

°C (41°F).

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Run engine at idle for at least 2 minutes.

3.

Confirm that EGR valve is not lifting.
If the result is NG, perform trouble diagnosis for DTC P1402. Refer to 

EC-457

 .

4.

Select “DATA MONITOR” mode with CONSULT-II.

5.

Read  “EGR TEMP SEN” at about 1,500 rpm while holding the
EGR valve in full open position by hand.
Voltage should decrease to less than 1.5V.
If the result is NG, go to 

EC-297, "Diagnostic Procedure"

 .

If the result is OK, go to following step.

6.

Turn ignition switch OFF and wait at least 5 seconds.

7.

Turn ignition switch ON.

8.

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

9.

Start engine and maintain the following conditions for at least 5
consecutive seconds.

10. If 1st trip DTC is detected, go to 

EC-297, "Diagnostic Procedure"

 .

SEF174Y

ENG SPEED

2,000 - 2,800 rpm

VHCL SPEED SE

10 km/h (6 MPH) or more

B/FUEL SCHDL

7 - 10.5 msec

THRTL POS SEN

(X + 0.23) 

− (X + 0.74) V

X = Voltage value measured at step 7

Selector lever

Suitable position

SEF201Y