sensor NISSAN TERRANO 2002 Service Repair Manual

Component Inspection
ENGINE COOLANT TEMPERATURE SENSOR
Check resistance as shown in the figure.
Temperature ÉC (ÉF) Resistance kW
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.0
90 (194) 0.236 - 0.260
If NG, replace engine coolant temperature sensor.SEF152P
SEF012P
DTC P0115 COOLANT TEMP SENTD27Ti
EC-364

Component Description
ACCELERATOR WORK UNIT
The accelerator position sensor is installed on the upper end of the
accelerator pedal assembly. The sensor detects the accelerator
position and sends a signal to the ECM. The ECM uses the signal
to determine the amount of fuel to be injected.
The accelerator position switch is installed inside the accelerator
position sensor. This switch is used for plausibility check of the
accelerator position sensor.
On Board Diagnosis Logic
DTC Malfunction is detected when ...Check Items
(Possible Cause)
P0120
0403IAn excessively low or high voltage from the sensor is
detected by the ECM.IHarness or connectors
(The sensor or switch circuit is open or
short-circuited.)
IAccelerator position sensor
IAccelerator position switch
DTC Confirmation Procedure A (For General
Plausibility)
WITH CONSULT-II
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Depress accelerator pedal fully and keep it for at least 1 sec-
ond. Then release it and wait at least 5 seconds.
WITHOUT CONSULT-II
1) Turn ignition switch to ªONº position.
2) Depress accelerator pedal fully and keep it for at least 1 sec-
ond. Then release it and wait at least 5 seconds.
3) Turn ignition switch to ªLOCKº position, wait at least 5 seconds
and then turn to ªONº position.
4) Perform ªDiagnostic Test Mode II (Self-diagnostic results)º with
ECM.
MEC959D
DTC P0120 ACCEL POS SENSORTD27Ti
EC-365

DTC Confirmation Procedure B (For
Accelerator Sticking)
If DTC P0571 is displayed same time, cure it at first.
WITH CONSULT-II
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and rev it up to above 1,300 rpm.
4) Depress brake pedal immediately after releasing accelerator
pedal and keep it at least 5 seconds.
WITHOUT CONSULT-II
1) Start engine and rev it up to above 1,300 rpm.
2) Depress brake pedal immediately after releasing accelerator
pedal and keep it at least 5 seconds.
3) Turn ignition switch to ªLOCKº position, wait at least 5 seconds
and then turn to ªONº position.
4) Perform ªDiagnostic Test Mode II (Self-diagnostic results)º with
ECM.
DTC P0120 ACCEL POS SENSORTD27Ti
EC-366

Wiring Diagram
YEC145A
DTC P0120 ACCEL POS SENSORTD27Ti
EC-367

Diagnostic Procedure
ACCELERATOR POSITION SENSOR
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect accelerator work unit har-
ness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between accelerator
work unit connector terminalq
5and
engine ground with CONSULT-II or
tester.
Voltage: Approximately 5V
OK
ENG
Check the following:
IHarness for open or
short-circuit between
ECM and accelerator
work unit.
If NG, repair harness or
connectors.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Loosen and retighten engine ground
screws.
3. Check harness continuity between
accelerator work unit connector termi-
nalq
2and ECM connector terminal
434. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following:
IHarness for open-circuit
between ECM and
accelerator work unit
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM terminal
425and accelerator
position sensor connector terminalq
4.
Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or connec-
tors.
CHECK COMPONENT
(Accelerator position sensor).
Refer to ªCOMPONENT INSPECTIONº on
page EC-371.
OK
ENG
Replace accelerator pedal
assembly.
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
NEF700
NEF591
YEC246A
H
H
H
H
H
H
H
DTC P0120 ACCEL POS SENSORTD27Ti
EC-368

ACCELERATOR POSITION SWITCH
The accelerator position switch detects OFF-accelerator switch sig-
nal and Full-accelerator switch signal and sends these signals to
the ECM. The ECM will then determine engine idle conditions.
These signals are also used for diagnosing the accelerator position
sensor.
INSPECTION START
CHECK OVERALL FUNCTION.
With CONSULT-II
1. Turn ignition switch to ªONº position.
2. Select ªFULL ACCELL SWº and ªOFF
ACCEL SWº in ªDATA MONITORº mode
with CONSULT-II.
3. Check ªFULL ACCEL SWº and ªOFF
ACCEL SWº signal under the following
conditions.
OFF ACCEL SW:
Accelerator pedal released
ÐON
Accelerator pedal depressed
Ð OFF
FULL ACCEL SW:
Accelerator pedal fully depressed
ÐON
Without CONSULT-II
1. Turn ignition switch to ªONº position.
2. Check voltage between ECM terminal
435
and body ground under the following condi-
tions:
Voltage:
Accelerator pedal released
Approximately 0V
Accelerator pedal fully depressed
Approximately 5V
NG
EOK
INSPECTION END
qA
MEC969D
MEC955D
H
H
DTC P0120 ACCEL POS SENSORTD27Ti
Diagnostic Procedure (Cont'd)
EC-369

qA
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect accelerator work unit har-
ness connector and ECM harness con-
nector.
3. Check harness continuity between
accelerator work unit terminalq
3and
ECM terminal
435. Refer to wiring
diagram.
Continuity should exist.
Check harness for short-circuit.
OK
ENG
Check the following:
I10A fuse in fuse box
I75A fusible link in fusible
link box
IHarness continuity
between ECM relay and
battery positive supply
IHarness for open or
short-circuit between
ECM relay and accelera-
tor position switch.
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector.
3. Check harness continuity between
accelerator work unit connector termi-
nalq
1and ECM connector terminal
426. Refer to wiring diagram.
Continuity should exist.
If OK; check harness for short-circuit.
If OK, re-connect harness connectors.
OK
ENG
Repair harness or connec-
tors.
CHECK COMPONENT.
(Accelerator position switch.)
Refer to ªCOMPONENT INSPECTIONº on
page EC-371.
OK
ENG
Replace accelerator pedal.
Disconnect and reconnect harness con-
nectors in the circuits. 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
SEF628S
H
H
H
H
H
H
DTC P0120 ACCEL POS SENSORTD27Ti
Diagnostic Procedure (Cont'd)
EC-370

Component Inspection
ACCELERATOR POSITION SENSOR
1. Disconnect accelerator work unit harness connector.
2. Make sure that resistance between terminalsq
2andq4changes
when opening throttle valve manually.
Throttle valve conditions Resistance [at 25ÉC (77ÉF)]
Completely closed Approximately 1.2 kW
Partially open 1.2 - 1.9 kW
Completely open Approximately 1.9 kW
If NG, replace accelerator pedal assembly.
CAUTION
IDo not disassemble accelerator pedal assembly.
ACCELERATOR POSITION SWITCH
1. Disconnect accelerator work unit harness connector.
2. Check continuity between terminalsq
1andq3.
Conditions Continuity
Accelerator pedal released No
Accelerator pedal depressed Yes
If NG, replace accelerator pedal assembly.
CAUTION:
IDo not disassemble accelerator pedal assembly.
MEC960D
MEC961D
DTC P0120 ACCEL POS SENSORTD27Ti
EC-371

Component Description
FUEL TEMPERATURE SENSOR (FTS)
The fuel temperature sensor is used to detect the fuel temperature
in the injection pump. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the fuel tempera-
ture input. The sensor uses a thermistor which is sensitive 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.
On Board Diagnosis Logic
DTC Malfunction is detected when ...Check Items
(Possible Cause)
P0180
0402IAn excessively high or low voltage from the sensor is
detected by ECM.IHarness or connectors
(The sensor circuit is open or short-circuited.)
IFuel temperature sensor
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 5 seconds.
WITHOUT CONSULT-II
1) Turn ignition switch to ªONº position and wait at least 5 sec-
onds.
2) Turn ignition switch to ªLOCKº position, wait at least 5 seconds
and then turn to ªONº position.
3) Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
DTC P0180 FUEL TEMP SENSORTD27Ti
EC-372

Wiring Diagram
YEC149A
DTC P0180 FUEL TEMP SENSORTD27Ti
EC-373