Nissan Frontier D22. Manual — part 443
DTC P0400 EGR FUNCTION
EC-875
[VG33E]
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EC
DTC P0400 EGR FUNCTION
PFP:14710
Description
UBS00DJY
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 does not flow through the solenoid valve. This causes the
intake manifold vacuum to be discharged into the atmosphere. The EGR valve remains closed.
●
Low engine coolant temperature
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Engine starting
●
High-speed engine operation
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Engine idling
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Excessively high engine coolant temperature
●
Mass air flow sensor malfunction
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 and EGRC-BPT valve operation. 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
Ignition switch
Start signal
Throttle position sensor
Throttle position
SEF317U
SEF783K
EC-876
[VG33E]
DTC P0400 EGR FUNCTION
EGRC-Solenoid Valve
The EGRC-solenoid valve responds to signals from the ECM. When
the ECM sends an ON (ground) signal, the coil in the solenoid valve
is energized. The vacuum signal (from the intake manifold collector
to the EGR valve) passes through the solenoid valve. The signal
then reaches the EGR valve.
When the ECM sends an OFF signal, a plunger will then move to cut
the vacuum signal from the intake manifold to the ECR valve.
On Board Diagnosis Logic
UBS00DJZ
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
UBS00DK0
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
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If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 5 seconds before conducting the next test.
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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.
SEF318UA
SEF073P
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible Cause
P0400
EGRC-solenoid
valve circuit close
●
No EGR flow is detected under condi-
tions that call for EGR.
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EGR valve stuck closed
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EGRC-BPT valve
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Vacuum hose
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EGRC-solenoid valve
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EGR passage
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EGR temperature sensor
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Exhaust gas leaks
DTC P0400 EGR FUNCTION
EC-877
[VG33E]
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EC
2.
Check “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.
Confirm COOLAN TEMP/S valve 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 engine coolant temperature with a fan or means other
than ambient air. Doing so may produce an inaccurate diagnos-
tic 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”.
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 60 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
Overall Function Check
UBS00DK1
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.
COOLAN TEMP/S: Less than 40
°C (104°F)
SEF013Y
SEF732Y
ENG SPEED
1,600 - 2,400 rpm (A/T)
1,800 - 2,600 rpm (M/T)
B/FUEL SCHDL
6 - 9 msec
THRTL POS SEN
X
− (X + 0.82) V
X = Voltage value measured at step 7
Selector lever
Suitable position
SEF733Y
SEF235Y
EC-878
[VG33E]
DTC P0400 EGR FUNCTION
2.
Check the EGR valve lifting when revving engine from 2,000 to 3,000 rpm quickly under no load using the
following methods.
EGR valve should lift up and down without sticking.
If NG, go to
EC-880, "Diagnostic Procedure"
.
3.
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.
4.
Turn ignition switch OFF.
5.
Disconnect EGR temperature sensor harness connector.
6.
Check harness continuity between EGR temperature sensor
harness connector terminal 2 and ground.
7.
Perform
EC-895, "Component Inspection"
SEF642Q
SEF182V
AEC660A
Continuity should exist.
SEF102S
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