NISSAN PRIMERA 1999 Electronic Repair Manual

Needle Lift Sensor (NLS)
The needle lift sensor is built into the No. 1 nozzle. Its inductive
pick-up element senses the lifting of the injection nozzle needle
and thus the start of injection. The signal is evaluated by the
ECM and compared with the target timing. Deviations in timing,
for example caused by changes in fuel temperature, are sensed
by the ECM and corrected.
Malfunction is detected when ....Check Items
(Possible Cause)
lAn improper signal from the sensor is sent to ECM.lHarness or connectors
(The sensor circuit is open or shorted.)
lNeedle lift sensor
lAir in fuel line
lClogging No. 1 injection nozzle
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
NOTE:
Before diagnostic trouble confirmation, be sure to check
battery voltage is above 9V.
1) Turn ignition switch to ªONº position and select
ªDATA MONITORº mode with CONSULT-II.
2) Start engine and run it for 2 seconds above 1,200
rpm.
NEF689 Nozzle holder
NozzleInductive
pick-up coli
TROUBLE DIAGNOSIS 9CD20T
EC-97

YEC806
NEEDLE
LIFT SEN-
SOR
: Detectable line for DTC
: Non-detectable line for DTC
ECM
TROUBLE DIAGNOSIS 9CD20T
Needle Lift Sensor (NLS) (Cont'd)
EC-98

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK FOR AIR IN FUEL FILTER.
1. Move priming pump up and down to
purge air from fuel filter.
2. Perform ªDIAGNOSTIC TROUBLE
CODE CONFIRMATION PROCE-
DUREº.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect ECM harness connector
and needle lift sensor harness con-
nector.
3. Check harness continuity between
needle lift sensor connector terminal
p1and ECM connector terminal
345.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Repair harness or con-
nectors.
CHECK GROUND CIRCUIT.
Check resistance between needle lift
sensor connector terminal
p2and
ECM connector terminal
333.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or con-
nectors.
CHECK NO. 1 INJECTION NOZZLE
FOR CLOGGING.
Refer to spray pattern test of ªINJEC-
TION NOZZLEº.
If NG, replace No. 1 injection nozzle.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
SEF671S
Priming pump
SEF606S
Needle lift sensor
harness connector
NEF206A
Needle lift sensor
connector
NEF205A
Needle lift sensor
connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 9CD20T
Needle Lift Sensor (NLS) (Cont'd)
EC-99

Fuel Cut Solenoid Valve
When the ignition switch is OFF, the ECM turns the fuel cut
solenoid valve OFF (under this condition, no current flows
through the fuel cut solenoid valve), shutting off fuel supply.
When the engine is not operating due to trouble, the fuel cut
solenoid valve may be OFF even when the ignition switch is ON.
Malfunction is detected when ...Check Items
(Possible Cause)
lFuel cut solenoid valve circuit is malfunctioning.lHarness or connectors
(The solenoid valve circuit is open or shorted.)
lFuel cut solenoid valve
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine. (If no start, circuit is open).
4) Warm engine up sufficiently.
5) Turn ignition switch to ªLOCKº position and wait at
least 5 seconds.
6) Start engine and rev it up above 1,300 rpm.
Release pedal and wait at least 3 seconds.
SEF667S Fuel cut solenoid valve
ECMIgnition
switch
TROUBLE DIAGNOSIS 10CD20T
EC-100

YEC807
BATTERY
Refer to EL-POWER.
: Detectable line for DTC
: Non-detectable line for DTC
INJECTION PUMP
(FUEL CUT SOLE-
NOID VALVE)
ENGINE
CONTROL
MODULE
RELAY
ECM
TROUBLE DIAGNOSIS 10CD20T
Fuel Cut Solenoid Valve (Cont'd)
EC-101

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK MAIN POWER SUPPLY.
Check power supply. Refer to
EC-CD-59.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªONº
position.
2. Select ªFUEL CUT SOL/Vº in
ªACTIVE TESTº mode with
CONSULT-II.
3. Touch ªONº and ªOFFº alter-
nately.
4. Check that operating sound is
emitted.
---------------------------------------------------------------------------------------------------------------------------------OR---------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to ªLOCKº
position.
2. Disconnect ECM harness con-
nector and electronic injection
pump harness connector.
3. Check harness continuity
between fuel cut solenoid valve
connector terminal
p1and
ECM connector terminal
349.
Continuity should exist.
If OK, check harness for short.
OK
ENG
Repair harness or con-
nectors.
CHECK COMPONENT
(Fuel cut solenoid valve).
Refer to ªCOMPONENT INSPECTIONº
on next page.
OK
ENG
Replace fuel cut solenoid
valve.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
NEF815
.Electronic injection
pump harness connector
(Fuel cut solenoid valve)
C2FCS01
NEF226A
Electronic injection
pump harness con-
nection
H
H
H
H
H
H
TROUBLE DIAGNOSIS 10CD20T
Fuel Cut Solenoid Valve (Cont'd)
EC-102

COMPONENT INSPECTION
Fuel cut solenoid valve
1. Remove fuel cut solenoid valve.
2. Check for lifting shaft when applying 12V direct current to
terminals.
If NG, replace fuel cut solenoid valve.
SEF859S ShaftFUSE
TROUBLE DIAGNOSIS 10CD20T
Fuel Cut Solenoid Valve (Cont'd)
EC-103

Fuel Temperature Sensor (FTS)
The fuel temperature sensor is used to detect the fuel tempera-
ture in the injection pump. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the fuel
temperature input. The sensor uses a thermistor which is sensi-
tive to the change in temperature. The electrical resistance of the
thermistor decreases as temperature increases.
The sensor is built into the inside electrical circuit of the injection
pump.
Malfunction is detected when ...Check Items
(Possible Cause)
lAn excessively high or low voltage from the sensor is
detected by ECM.lHarness or connectors
(The sensor circuit is open or shorted.)
lFuel temperature sensor
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 5 seconds.
TROUBLE DIAGNOSIS 11CD20T
EC-104

YEC808
INJECTION PUMP
(FUEL TEMPERATURE
SENSOR)
: Detectable line for DTC
: Non-detectable line for DTC
ECM
TROUBLE DIAGNOSIS 11CD20T
Fuel Temperature Sensor (FTS) (Cont'd)
EC-105

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect fuel temperature sensor
harness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between injection
pump connector terminal
p6and
ground with CONSULT-II or voltage
tester.
Voltage:
Approximately 5V
OK
ENG
Repair harness or con-
nectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Check harness continuity between
injection pump connector terminal
p5and ECM connector terminals
335,436.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Repair harness or con-
nectors.
CHECK COMPONENT
(Fuel temperature sensor).
Refer to ªCOMPONENT INSPECTIONº
on next page.
OK
ENG
Have the injection pump
assembly serviced by an
authorised service repre-
sentative.
Disconnect and reconnect harness
connectors in the circuits. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
NEF818
.Electronic injection
pump harness connector
(Fuel temperature sensor)
NEF819
Injection pump
connector
NEF208A
Injection pump
connector
F50
H
H
H
H
H
H
TROUBLE DIAGNOSIS 11CD20T
Fuel Temperature Sensor (FTS) (Cont'd)
EC-106