Infiniti G20 (P11). Manual — part 234
Description
NCEC0513
SYSTEM DESCRIPTION
NCEC0513S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor
Engine speed
EGR vol-
ume control
EGR volume control valve
Vehicle speed sensor
Vehicle speed
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Throttle position sensor
Throttle position
Battery
Battery voltage
Mass air flow sensor
Amount of intake air
Air conditioner switch
Air conditioner operation
Power steering oil pressure switch
Power steering load signal
Electrical load
Electrical load signal
PNP switch
Park/Neutral position signal
TCM (Transmission Control Module)
Gear position, shifting signal
This system controls flow rate of EGR led from exhaust manifold
to intake manifold. The opening of the EGR by-pass passage in the
EGR volume control valve changes to control the flow rate. A
built-in step motor moves the valve in steps corresponding to the
ECM output pulses. The opening of the valve varies for optimum
engine control. The optimum value stored in the ECM is determined
by considering various engine conditions. The EGR volume control
valve remains close under the following conditions.
I
Engine stopped
I
Engine starting
I
Engine idling
I
Low engine coolant temperature
I
Excessively high engine coolant temperature
I
High engine speed
I
Wide open throttle
I
Low battery voltage
SEF551W
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0400 EGR FUNCTION (CLOSE)
Description
EC-347
SEF552W
COMPONENT DESCRIPTION
NCEC0513S02
EGR volume control valve
NCEC0513S0201
The EGR volume control valve uses a step motor to control the flow
rate of EGR from exhaust manifold. This motor has four winding
phases. It operates according to the output pulse signal of the
ECM. Two windings are turned ON and OFF in sequence. Each
time an ON pulse is issued, the valve opens or closes, changing
the flow rate. When no change in the flow rate is needed, the ECM
does not issue the pulse signal. A certain voltage signal is issued
so that the valve remains at that particular opening.
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0514
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
EGR TEMP SEN
I
Engine: After warming up
Less than 4.5V
EGR VOL CON/V
I
Engine: After warming up
I
Air conditioner switch: “OFF”
I
Shift lever: “N”
I
No-load
Idle
0 step
Revving engine up to 3,000 rpm
quickly
10 - 55 step
ECM Terminals and Reference Value
NCEC0644
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
8
9
17
18
SB
W/B
R/W
G/R
EGR volume control
valve
[Engine is running]
I
Idle speed
0.1 - 14V
58
B
Sensor’s ground
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0V
72
R/B
EGR temperature sen-
sor
[Engine is running]
I
Warm-up condition
I
Idle speed
Less than 4.5V
[Engine is running]
I
Warm-up condition
I
EGR system is operating
0 - 1.5V
SEF073P
On Board Diagnosis Logic
NCEC0515
If the absence of EGR flow is detected by EGR temperature sen-
sor under the condition that calls for EGR, a low-flow malfunction
is diagnosed.
Malfunction is detected when no EGR flow is detected under con-
dition that calls for EGR.
DTC P0400 EGR FUNCTION (CLOSE)
Description (Cont’d)
EC-348
Possible Cause
NCEC0516
I
Harness or connectors
(EGR volume control valve circuit is open or shorted.)
I
EGR volume control valve stuck closed
I
Dead (Weak) battery
I
EGR passage clogged
I
EGR temperature sensor and circuit
I
Exhaust gas leaks
SEF191Y
SEF192Y
SEF235Y
DTC Confirmation Procedure
NCEC0517
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
I
If
“DTC
Confirmation
Procedure”
has
been
previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
I
P0400 will not be displayed at “SELF-DIAG RESULTS” mode
with CONSULT-II even though DTC work support test result is
NG.
TESTING CONDITION:
I
Before performing the following procedure, confirm bat-
tery voltage is more than 10V at idle, then stop engine
immediately.
I
For best results, perform the test at a temperature of 5°C
(41°F) or higher.
WITH CONSULT-II
NCEC0517S01
1)
Turn ignition switch “OFF” and wait at least 10 seconds.
2)
Turn ignition switch “ON”
3)
Check “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.
Confirm COOLAN TEMP/S value is within the range listed
below.
COOLAN TEMP/S: Less than 40°C (104°F)
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
diagnostic result.
4)
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.
5)
Select “EGR SYSTEM P0400” of “EGR SYSTEM” in “DTC
WORK SUPPORT” mode with CONSULT-II.
6)
Touch “START”.
7)
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
10.
If “COMPLETED” does not appear on CONSULT-II screen, go
to the following step.
8)
Check the output voltage of “THRTL POS SEN” (at closed
throttle position) and note it.
9)
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0400 EGR FUNCTION (CLOSE)
Possible Cause
EC-349
until “TESTING” changes to “COMPLETED”. (It will take
approximately 30 seconds or more.)
ENG SPEED
1,800 - 2,800 rpm
Vehicle speed
More than 10 km/h (6 MPH)
B/FUEL SCHDL
5.0 - 8.5 msec
THRTL POS SEN
(X + 0.05) – (X + 0.87) V
X = Voltage value measured at step 8
Selector lever
Suitable position
If “TESTING” is not displayed after 5 minutes, retry from
step 2.
10) Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”.
If
“NG”
is
displayed,
refer
to
“Diagnostic
Procedure”, EC-352.
SEF066X
WITH GST
NCEC0517S02
1)
Turn ignition switch “OFF” and wait at least 10 seconds.
2)
Turn ignition switch “ON”.
3)
Check engine coolant temperature in MODE 1 with GST.
Engine coolant temperature: Less than 40°C (104°F)
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.
4)
Start engine and let it idle monitoring the value of “COOLAN
TEMP/S”. When the engine coolant temperature reaches 70°C
(158°F), immediately go to the next step.
5)
Maintain the following conditions for at least 1 minute.
Engine speed: 1,800 - 2,800 rpm
Vehicle speed: More than 10 km/h (6 MPH)
Voltage between ECM terminal 92 and ground: 0.86 - 2.0V
Selector lever: Suitable position
6)
Stop vehicle.
7)
Turn ignition switch “OFF” and wait at least 10 seconds, then
turn “ON”.
8)
Repeat step 3 to 5.
9)
Select “MODE 3” with GST.
10) If DTC is detected, go to “Diagnostic Procedure”, EC-352.
I
When using GST, “DTC Confirmation Procedure” should
be performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) con-
cerning this diagnosis. Therefore, using CONSULT-II is
recommended.
DTC P0400 EGR FUNCTION (CLOSE)
DTC Confirmation Procedure (Cont’d)
EC-350
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