Nissan Frontier D22. Manual - part 293

 

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Nissan Frontier D22. Manual - part 293

 

 

DTC P0340 CMP SENSOR

EC-275

[KA24DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

3.

Check voltage between ECM terminal 49 and engine ground, ECM terminals 44, 48 and engine ground.

Removal and Installation

UBS00D6H

CAMSHAFT POSITION SENSOR

Refer to 

EM-13, "OUTER COMPONENT PARTS"

LEC035A

EC-276

[KA24DE]

DTC P0400 EGR FUNCTION

DTC P0400 EGR FUNCTION

PFP:14710

Description

UBS00D6I

SYSTEM DESCRIPTION

This system cuts and controls vacuum applied to the EGR valve to suit engine operating conditions. This cut-
and-control operation is accomplished through the ECM and the EGRC solenoid valve. When the ECM
detects any of the following conditions, current flows through the solenoid valve is cut. This causes the vac-
uum to be discharged into the atmosphere. The EGR valve remains closed.

Low engine coolant temperature

Engine stopped

Engine starting

High-speed engine operation

Engine idling

Excessively high engine coolant temperature

High engine speed 

Wide open throttle

Mass air flow sensor malfunction

Low intake air temperature

COMPONENT DESCRIPTION
Exhaust Gas Recirculation (EGR) Valve

The EGR valve controls the amount of exhaust gas routed to the
intake manifold. Vacuum is applied to the EGR valve in response to
throttle valve opening. The vacuum controls the movement of a taper
valve connected to the vacuum diaphragm in the EGR valve.

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor

Engine speed

EGR control

EGRC solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Intake air temperature sensor

Intake air temperature

Ignition switch

Start signal

Throttle position sensor

Throttle position

Vehicle speed sensor

Vehicle speed

SEF641Q

SEF783K

DTC P0400 EGR FUNCTION

EC-277

[KA24DE]

C

D

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EC

EGR temperature sensor

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

EGRC Solenoid Valve

The EGRC solenoid valve responds to signals from the ECM. When
the ECM sends an OFF signal, the vacuum signal passes through
the solenoid valve. The signal then reaches the EGR valve.
When the ECM sends an ON signal, a plunger will then move to cut
the vacuum signal from the intake manifold collector to the EGR
valve.

CONSULT-II Reference Value in Data Monitor Mode

UBS00ELX

Specification data are reference values.

SEF599K

EGR temperature

°C (°F)

Voltage*

 V

Resistance

M

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

SEF240PD

MONITOR ITEM

CONDITION

SPECIFICATION

EGR TEMP SEN

Engine: After warming up

Less than 4.5V

EC-278

[KA24DE]

DTC P0400 EGR FUNCTION

On Board Diagnosis Logic

UBS00D6J

If the absence of EGR flow is detected by EGR temperature sensor under the condition that calls for EGR, a
low-flow malfunction is diagnosed.

DTC Confirmation Procedure

UBS00D6K

CAUTION:

Always drive vehicle at a safe speed.

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.

P0400 will not be displayed at “SELF-DIAG RESULTS” mode with CONSULT-II even though DTC work
support test result is “NG”.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Check  “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II and confirm it is within the range listed below.

If the value is out of range, park the vehicle in a cool place and
allow the engine temperature to stabilize. Do not attempt to
lower the coolant temperature with a fan or means other than
ambient air. Doing so may produce an inaccurate diagnostic
result.

3.

Start engine and let it idle monitoring “COOLAN TEMP/S” value.
When the “COOLAN TEMP/S” value reaches 70

°C (158°F),

immediately go to the next step.

4.

Select “EGR SYSTEM P0400” of “EGR SYSTEM” in “DTC WORK SUPPORT” mode with CONSULT-II.

5.

Touch “START”.

EGRC SOL/V

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N

No-load

Idle

OFF

Engine speed: Revving engine from 
idle to 3,000 rpm quickly.

ON

MONITOR ITEM

CONDITION

SPECIFICATION

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P0400

EGR function (close)

 No EGR flow is detected under conditions 
that call for EGR.

Harness or connectors
(The EGR volume control valve cir-
cuit is open or short)

EGR valve stuck closed

EGRC-BPT valve

Vacuum hose

EGRC solenoid valve

EGR passage clogged

EGR temperature sensor and circuit

Exhaust gas leaks

COOLAN TEMP/S

: Less than 40

°C (104°F)

SEF013Y

SEF191Y

 

 

 

 

 

 

 

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