Nissan Terrano model r20 series 2004. Instruction — part 182
Component Description
NEEDLE LIFT SENSOR (NLS)
The needle lift sensor is built into the No. 1 nozzle. Its inductive
pickup element senses fuel injection timing. It is sent as a pulse
signal to the ECM for feed-back the actual fuel injection timing and
calculating the secondary engine speed.
On Board Diagnosis Logic
DTC
Malfunction is detected when .
Check Items
(Possible Cause)
P1240
0304
I
An incorrect signal from the sensor is sent to ECM.
I
Harness or connectors
(The sensor circuit is open or short-circuited.)
I
Needle lift sensor
P1242
0906
DTC Confirmation Procedure
NOTE:
Before DTC confirmation, be sure to check battery voltage is
above 9V.
WITH CONSULT-II
1) Turn ignition switch to “ON” position and select “DATA MONI-
TOR” mode with CONSULT-II.
2) Start engine.
3) Run it for 2 seconds at above 1,200 rpm.
WITHOUT CONSULT-II
1) Start engine.
2) Run it for 2 seconds at above 1,200 rpm.
3) Turn ignition switch to “LOCK” position, wait at least 5 seconds
and then turn to “ON” position.
4) Perform “Diagnostic Test Mode II” (Self-diagnostic results).
NEF689
DTC P1240 NEEDLE LIFT SEN, DTC P1242 NEEDLE LIFT SE
(RPM)
TD27Ti
EC-450
Wiring Diagram
YEC682A
DTC P1240 NEEDLE LIFT SEN, DTC P1242 NEEDLE LIFT SE
(RPM)
TD27Ti
EC-451
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” position.
2. Disconnect ECM harness connector
and needle lift sensor harness connec-
tor.
3. Check harness continuity between
needle lift sensor connector terminal
q
1
and ECM connector terminal
345
.
Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness for open circuit
between needle lift sen-
sor and ECM
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT-I.
Check harness continuity between needle
lift sensor connector terminals
q
2
and
ECM connector terminals
333
. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness for open or
short-circuit between
ECM and needle lift sen-
sor.
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT-II.
Check resistance between ECM connector
terminal
346
and engine ground. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness for open-circuit
between ECM and
engine ground
If NG, repair harness or
connectors.
CHECK NO. 1 INJECTION NOZZLE FOR
CLOGGING.
Refer to spray pattern test of “INJECTION
NOZZLE”.
If NG, replace No. 1 injection nozzle.
q
A
NEF591
NEF690
NEF463
H
H
H
H
H
H
DTC P1240 NEEDLE LIFT SEN, DTC P1242 NEEDLE LIFT SE
(RPM)
TD27Ti
EC-452
q
A
CHECK COMPONENT.
(Needle lift sensor)
Refer to “COMPONENT INSPECTION” on
EC-453.
E
NG
Replace needle lift sensor.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
Component Inspection
NEEDLE LIFT SENSOR
1. Disconnect needle lift sensor harness connector.
2. Check continuity between needle lift sensor terminals
q
1
and
q
2
.
Resistance: Approximately 105
Ω
[at 25°C (77°F)]
If NG, replace needle lift sensor with injection nozzle holder.
MEC962D
H
H
H
H
DTC P1240 NEEDLE LIFT SEN, DTC P1242 NEEDLE LIFT SE
(RPM)
TD27Ti
Diagnostic Procedure (Cont’d)
EC-453
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