Nissan Primera P11. Instruction — part 98
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)
●
An improper signal from the sensor is sent to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Needle lift sensor
●
Air in fuel line
●
Clogging 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 “ON” position and select
“DATA MONITOR” mode with CONSULT-II.
2)
Start engine and run it for 2 seconds above 1,200
rpm.
NEF689
Nozzle holder
Nozzle
Inductive
pick-up coli
TROUBLE DIAGNOSIS 9
CD20T
EC-97
YEC806
NEEDLE
LIFT SEN-
SOR
: Detectable line for DTC
: Non-detectable line for DTC
ECM
TROUBLE DIAGNOSIS 9
CD20T
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 “DIAGNOSTIC TROUBLE
CODE CONFIRMATION PROCE-
DURE”.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to “LOCK” posi-
tion.
2. Disconnect ECM harness connector
and needle lift sensor harness con-
nector.
3. Check harness continuity between
needle lift sensor connector terminal
p
1
and ECM connector terminal
345
.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
E
NG
Repair harness or con-
nectors.
CHECK GROUND CIRCUIT.
Check resistance between needle lift
sensor connector terminal
p
2
and
ECM connector terminal
333
.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Repair harness or con-
nectors.
CHECK NO. 1 INJECTION NOZZLE
FOR CLOGGING.
Refer to spray pattern test of “INJEC-
TION NOZZLE”.
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 9
CD20T
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)
●
Fuel cut solenoid valve circuit is malfunctioning.
●
Harness or connectors
(The solenoid valve circuit is open or shorted.)
●
Fuel cut solenoid valve
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1)
Turn ignition switch to “ON” position.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine. (If no start, circuit is open).
4)
Warm engine up sufficiently.
5)
Turn ignition switch to “LOCK” 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
ECM
Ignition
switch
TROUBLE DIAGNOSIS 10
CD20T
EC-100
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