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
E
F
G
H
I
J
K
L
M
A
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
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
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
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст