1999 NISSAN PRIMERA sensor

pB
CHECK COOLING SYSTEM FOR LEAK.
Apply pressure to the cooling system with a
tester, and check if the pressure drops.
Testing pressure:
157kPa (1.57 bar, 1.6 kg/cm
2, 23 psi)
Pressure should not drop.
CAUTION:
Higher than the specified pressure may
cause radiator damage.
OK
ENG
Check the following
for leaks:
lHoselRadiatorlWater pump
Refer to LC section
(ªWater Pumpº).
CHECK RADIATOR CAP.
Apply pressure to cap with a tester.
Radiator cap relief pressure:
Standard
78 - 98 kPa (0.78 - 0.98 bar,
0.8 - 1.0 kg/cm
2, 11 - 14 psi)
Limit
59 - 88 kPa (0.59 - 0.88 bar,
0.6 - 0.9 kg/cm
2,9-13psi)
OK
ENG
Replace radiator
cap.
CHECK THERMOSTAT.
1. Check valve seating condition at normal
room temperatures.
It should seat tightly.
2. Check valve opening temperature and
maximum valve lift.
Valve opening temperature:
76.5ÉC (170ÉF) [standard]
Maximum valve lift:
More than 8 mm/90ÉC
(0.31 in/194ÉF)
3. Check if valve is closed at 5ÉC (9ÉF)
below valve opening temperature.
For details, refer to LC section
(ªThermostatº).
OK
ENG
Replace thermostat.
Check engine coolant temperature sensor.
Refer to ªCOMPONENT INSPECTIONº,
EC-69.
OK
ENG
Replace engine cool-
ant temperature sen-
sor.
If the cause can not be isolated, go to ª12
MAIN CAUSES OF OVERHEATINGº on
next page.
INSPECTION END
Perform FINAL CHECK by the following procedure after
repair is completed.
1. Warm up engine. Run the vehicle for at least 20 minutes. Pay
attention to engine coolant temperature gauge on the instru-
ment panel. If the reading shows an abnormally high
temperature, another part may be malfunctioning.
2. Stop vehicle and let engine idle. Check the intake and
exhaust systems for leaks by listening for noise or visually
inspecting the components.
3. Allow engine to cool and visually check for oil and coolant
leaks. Then, perform ªOVERALL FUNCTION CHECKº.
Hose adapter
.SLC754AA
SLC755AA
SLC343
H
H
H
H
H
H
TROUBLE DIAGNOSIS 8CD20T
Cooling Fan (Overheat) (Cont'd)
EC-94

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 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

COMPONENT INSPECTION
Fuel temperature sensor
Wait until fuel temperature sensor reaches room temperature.
Check resistance between terminals
p5andp6.
Fuel temperature ÉC (ÉF) Resistance kW
25 (77)Approximately 1.9
If NG, have the injection pump assembly serviced by an autho-
rised service representative.YEC366
TROUBLE DIAGNOSIS 11CD20T
Fuel Temperature Sensor (FTS) (Cont'd)
EC-107