Infiniti G20 (P11). Manual — part 236
7
CHECK EGR VOLUME CONTROL VALVE-I
Check resistance between EGR volume control valve terminal 2 and terminals 1, 3, terminal 5 and terminals 4, 6.
SEF588X
OK or NG
OK (With CONSULT-II)
©
GO TO 8.
OK (Without CONSULT-
II)
©
GO TO 9.
NG
©
Replace EGR volume control valve.
8
CHECK EGR VOLUME CONTROL VALVE-II
With CONSULT-II
1. Remove EGR volume control valve.
2. Reconnect ECM harness connector and EGR volume control valve harness connector.
3. Turn ignition switch “ON”.
4. Perform “EGR VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-II.
5. Check that EGR volume control valve shaft moves smoothly forward and backward according to the valve opening
steps.
SEF067Y
OK or NG
OK
©
GO TO 10.
NG
©
Replace EGR volume control valve.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0400 EGR FUNCTION (CLOSE)
Diagnostic Procedure (Cont’d)
EC-355
9
CHECK EGR VOLUME CONTROL VALVE-II
Without CONSULT-II
1. Remove EGR volume control valve.
2. Reconnect ECM harness connector and EGR volume control valve harness connector.
3. Turn ignition switch “ON” and “OFF”.
4. Check that EGR volume control valve shaft moves smoothly forward and backward according to the ignition switch
position.
SEF560W
OK or NG
OK
©
GO TO 10.
NG
©
Replace EGR volume control valve.
10
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-146.
©
INSPECTION END
DTC P0400 EGR FUNCTION (CLOSE)
Diagnostic Procedure (Cont’d)
EC-356
Description
NCEC0520
SYSTEM DESCRIPTION
NCEC0520S01
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 P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
Description
EC-357
SEF552W
COMPONENT DESCRIPTION
NCEC0520S02
EGR volume control valve
NCEC0520S0201
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
NCEC0521
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
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
NCEC0645
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.
TER-
MINAL
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
On Board Diagnosis Logic
NCEC0522
Malfunction is detected when an improper voltage signal is sent to
ECM through the valve.
FAIL-SAFE MODE
NCEC0522S01
When the ECM enters the fail-safe mode, the MIL illuminates.
Detected items
Engine operating condition in fail-safe mode
EGR volume control valve cir-
cuit
Engine speed will not rise more than 2,800 rpm due to the fuel cut.
DTC P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
Description (Cont’d)
EC-358
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