1999 NISSAN PRIMERA Control

DescriptionNCEC0504SYSTEM DESCRIPTIONNCEC0504S01
Sensor Input Signal to ECMECM func-
tionActuator
Crankshaft position sensor Engine speed
EGR control EGR volume control 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
Vehicle speed sensor or ABS actuator and
electric unit (control unit)Vehicle speed
Battery Battery voltage
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 closed under the following conditions.
ILow engine coolant temperature
IEngine starting
IHigh-speed engine operation
IExtremely light load engine operation
IEngine idling
IExcessively high engine coolant temperature
IWide open throttle
IMass air flow sensor malfunction
ILow battery voltage
COMPONENT DESCRIPTIONNCEC0504S02The 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.
SEF551W
SEF552W
DTC P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
(IF SO EQUIPPED)QG16I18DE
Description
EC-252

CONSULT-II Reference Value in Data Monitor
Mode
NCEC0506Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
EGR VOL CON/VIEngine: After warming up
IShift lever: ªNº
INo-loadIdle 0 step
Revving engine up to 3,000 rpm
quickly10 - 55 step
ECM Terminals and Reference ValueNCEC0507Specification 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 damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
8
9
17
18W/B
SB
G/R
R/YEGR volume control valve[Engine is running]
IWarm-up condition
IRev engine up from 2,000 to 4,000 rpm0 - 14V
On Board Diagnosis LogicNCEC0508
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0403
0403IAn improper voltage signal is sent to ECM through the
valve.IHarness or connectors
(The EGR volume control valve circuit is open or
shorted.)
IEGR volume control valve
DTC Confirmation ProcedureNCEC0509NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
With CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and warm it up to normal operating temperature.
4) Rev engine from idle to 2,000 rpm 20 times.
NEF110A
DTC P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
(IF SO EQUIPPED)QG16I18DE
CONSULT-II Reference Value in Data Monitor Mode
EC-253

If 1st trip DTC is detected, go to ªDiagnostic Procedureº, EC-
QG-256.
With GST
Follow the procedure ªWith CONSULT-IIº above.
DTC P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
(IF SO EQUIPPED)QG16I18DE
DTC Confirmation Procedure (Cont'd)
EC-254

Wiring DiagramNCEC0510
YEC782
: Detectable line for DTC
: Non-detectable line for DTC
ECM ECM RELAYEGR
VOLUME
CONTROL
VA LV E Refer to
EL-POWER. BATTERY
DTC P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
(IF SO EQUIPPED)QG16I18DE
Wiring Diagram
EC-255

Diagnostic ProcedureNCEC0511
1 CHECK POWER SUPPLY
1. Disconnect EGR volume control valve harness connector.
2. Turn ignition switch ªONº.
3. Check voltage between terminals 2, 5 and ground with CONSULT-II or tester.
SEF556WVoltage: Battery voltage
OK or NG
OK©GO TO 2.
NG©Check the following.
IHarness or connectors E90, F73
IHarness for open or short between EGR volume control valve and engine control
module relay
If NG, repair harness or connectors.
2 CHECK OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM terminal 8 and EGR volume control valve terminal 1,
ECM terminal 9 and EGR volume control valve terminal 4,
ECM terminal 17 and EGR volume control valve terminal 3,
ECM terminal 18 and EGR volume control valve terminal 6.
Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short to ground and short to power.
OK or NG
OK©GO TO 3.
NG©Repair open circuit, short to ground or short to power in harness connectors.
3 CHECK EGR VOLUME CONTROL VALVE
Refer to ªComponent Inspectionº, EC-QG-257.
OK or NG
OK©GO TO 4.
NG©Replace EGR volume control valve.
4 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-QG-102.
©INSPECTION END
DTC P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
(IF SO EQUIPPED)QG16I18DE
Diagnostic Procedure
EC-256

Component InspectionNCEC0512EGR VOLUME CONTROL VALVENCEC0512S01With CONSULT-II
1) Disconnect EGR volume control valve harness connector.
2) Check resistance between the following terminals.
terminal 2 and terminals 1, 3
terminal 5 and terminals 4, 6
Temperature ÉC (ÉF) ResistanceW
20 (68) 20 - 24
3) Reconnect EGR volume control valve harness connector.
4) Remove EGR volume control valve from cylinder head.
(The EGR volume control valve harness connector should
remain connected.)
5) Turn ignition switch ªONº.
6) Perform ªEGR VOL CONT/Vº in ªACTIVE TESTº mode with
CONSULT-II. Check that EGR volume control valve shaft
moves smoothly forward and backward according to the valve
opening.
If NG, replace the EGR volume control valve.
Without CONSULT-II
1) Disconnect EGR volume control valve harness connector.
2) Check resistance between the following terminals.
terminal 2 and terminals 1, 3
terminal 5 and terminals 4, 6
Temperature ÉC (ÉF) ResistanceW
20 (68) 20 - 24
3) Turn ignition switch ªONº and ªOFFº. Check that EGR volume
control valve shaft moves smoothly forward and backward
according to the ignition switch position.
If NG, replace the EGR volume control valve.
SEF069X
SEF558W
NEF109A
SEF560W
DTC P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
(IF SO EQUIPPED)QG16I18DE
Component Inspection
EC-257

DescriptionNCEC0248SYSTEM DESCRIPTIONNCEC0248S01
Sensor Input Signal to ECMECM func-
tionActuator
Crankshaft position sensor (POS) Engine speed
EVAP can-
ister purge
controlEVAP canister purge volume
control solenoid valve Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Battery Battery voltage
Ignition switch Start signal
Throttle position sensor Throttle position
Heated oxygen 1 sensorDensity of oxygen in exhaust gas
(Mixture ratio feedback signal)
Vehicle speed sensor or ABS actuator and
electric unit (control unit)Vehicle speed
This system controls flow rate of fuel vapor from the EVAP canis-
ter. The opening of the vapor by-pass passage in the EVAP canis-
ter purge volume control solenoid valve changes to control the flow
rate. The EVAP canister purge volume control solenoid valve
repeats ON/OFF operation according to the signal sent from the
ECM. The opening of the valve varies for optimum engine control.
The optimum value stored in the ECM is determined by consider-
ing various engine conditions. When the engine is operating, the
flow rate of fuel vapor from the EVAP canister is regulated as the
air flow changes.
COMPONENT DESCRIPTIONNCEC0248S02The EVAP canister purge volume control solenoid valve uses a
ON/OFF duty to control the flow rate of fuel vapor from the EVAP
canister. The EVAP canister purge volume control solenoid valve
is moved by ON/OFF pulses from the ECM. The longer the ON
pulse, the greater the amount of fuel vapor that will flow through the
valve.
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0249
MONITOR ITEM CONDITION SPECIFICATION
PURG VOL C/VIEngine: After warming up
INo-load
ILift up drive wheels and shift to
1st gear position.
IAir conditioner switch ªOFFºIdle 0%
More than 2,000 rpm Ð
SEF337U
DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL
SOLENOID VALVE (CIRCUIT)QG16I18DE
Description
EC-262

ECM Terminals and Reference ValueNCEC0250Specification 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
COLORITEM CONDITION DATA (DC Voltage)
14 P/BEVAP canister purge vol-
ume control solenoid valve[Engine is running]
IWarm-up condition
IIdle speedBATTERY VOLTAGE
(11 - 14V)
[Vehicle is running]
IWarm-up condition
I2,000 rpm5 - 12V
On Board Diagnosis LogicNCEC0251
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0443
0443IAn improper voltage signal is sent to ECM through the
valve.IHarness or connectors
(The valve circuit is open or shorted.)
IEVAP canister purge volume control solenoid
valve
DTC Confirmation ProcedureNCEC0252NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm battery
voltage is more than 11V.
With CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and let it idle for at least 5 seconds.
4) If 1st trip DTC is detected, go to ªDiagnostic Procedureº, EC-
QG-265.
With GST
Follow the procedure ªWith CONSULT-IIº above.
NEF068A
DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL
SOLENOID VALVE (CIRCUIT)QG16I18DE
ECM Terminals and Reference Value
EC-263