Nissan Primera P11. Manual — part 173
Diagnostic Procedure
NCEC0232
1
CHECK EXHAUST SYSTEM
1. Start engine.
2. Check exhaust pipes and muffler for leaks.
SEF099P
OK or NG
OK (With CONSULT-II)
©
GO TO 2.
OK (Without CONSULT-II)
©
GO TO 3.
NG
©
Repair or replace exhaust system.
2
CHECK POWER SUPPLY
1. Disconnect EGR volume control valve harness connector.
2. Turn ignition switch “ON”.
3. Check voltage between terminals 2, 5 and ground with CONSULT-II or tester.
DISCONNECT
SEF556WA
Voltage: Battery voltage
OK or NG
OK
©
GO TO 3.
NG
©
Check the following.
I
Harness or connectors E90, F73
I
Harness for open or short between EGR volume control valve and engine control
module relay
If NG, repair harness or connectors.
DTC P0400 EGR FUNCTION (CLOSE) (IF SO EQUIPPED)
QG16
I
18DE
Diagnostic Procedure
EC-249
3
CHECK OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch “OFF”.
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 4.
NG
©
Repair open circuit, short to ground or short to power in harness connectors.
4
CHECK EGR PASSAGE
Check EGR passage for clogging and cracks.
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace EGR passage.
5
CHECK EGR TEMPERATURE SENSOR
Refer to “TROUBLE DIAGNOSIS FOR DTC P1401”, EC-QG-300.
OK or NG
OK
©
GO TO 6.
NG
©
Replace EGR temperature sensor.
6
CHECK EGR VOLUME CONTROL VALVE
Refer to “Component Inspection”, EC-QG-251.
OK or NG
OK
©
GO TO 7.
NG
©
Replace EGR volume control valve.
7
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-QG-102.
©
INSPECTION END
DTC P0400 EGR FUNCTION (CLOSE) (IF SO EQUIPPED)
QG16
I
18DE
Diagnostic Procedure (Cont’d)
EC-250
Component Inspection
NCEC0233
EGR VOLUME CONTROL VALVE
NCEC0233S01
With 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 °C (°F)
Resistance
Ω
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 “ON”.
6)
Perform “EGR VOL CONT/V” in “ACTIVE TEST” 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 °C (°F)
Resistance
Ω
20 (68)
20 - 24
3)
Turn ignition switch “ON” and “OFF”. 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 P0400 EGR FUNCTION (CLOSE) (IF SO EQUIPPED)
QG16
I
18DE
Component Inspection
EC-251
Description
NCEC0504
SYSTEM DESCRIPTION
NCEC0504S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
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.
I
Low engine coolant temperature
I
Engine starting
I
High-speed engine operation
I
Extremely light load engine operation
I
Engine idling
I
Excessively high engine coolant temperature
I
Wide open throttle
I
Mass air flow sensor malfunction
I
Low battery voltage
COMPONENT DESCRIPTION
NCEC0504S02
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.
SEF551W
SEF552W
DTC P0403 EGR VOLUME CONTROL VALVE (CIRCUIT)
(IF SO EQUIPPED)
QG16
I
18DE
Description
EC-252
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