2002 NISSAN TERRANO Service Repair Manual

Diagnostic Procedure
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect mass air flow sensor har-
ness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between mass air flow
sensor connector terminalq
2and
engine ground with CONSULT-II or
tester.
Voltage: Battery positive voltage
OK
ENG
Check the following:
I20A fuse
IECM Relay
IHarness continuity
between ECM relay (coil
and load side) connector
and battery supply
IHarness connectors
F100,M755(RHD mod-
els)
IHarness connectors
M787,F66(LHD mod-
els)
IHarness continuity
between ECM relay con-
nector and Mass Air
Flow Sensor Connector.
If NG, replace 20A fuse or
ECM relay, or repair har-
ness or connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector.
3. Loosen and retighten engine ground
screws.
4. Check harness continuity between
mass air flow sensor harness connec-
tor terminalq
3and ECM connector ter-
minal218. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following.
IHarness connectors
F100,M755(RHD mod-
els)
IHarness continuity
between mass air flow
sensor and ECM
If NG, repair or replace
harness or connectors.
CHECK INPUT SIGNAL CIRCUIT.
Check harness continuity between mass
air flow sensor connector terminalq
4and
ECM connector terminal223. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following.
IHarness connectors
F100,M755(RHD mod-
els)
IHarness continuity
between mass air flow
sensor and ECM
If NG, repair or replace
harness or connectors.
CHECK INPUT SIGNAL CIRCUIT.
Check harness continuity between mass
air flow sensor connector terminalq
5and
ECM connector terminal224. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following.
IHarness connectors
F100,M755(RHD mod-
els)
IHarness continuity
between mass air flow
sensor and ECM
If NG, repair or replace
harness or connectors.
CHECK COMPONENT
(Mass air flow sensor).
Refer to ªCOMPONENT INSPECTIONº,
EC-360.
OK
ENG
Replace mass air flow sen-
sor.
qA
NEF664
NEF591
NEF352
H
H
H
H
H
H
DTC P0100 MASS AIR FLOW SENTD27Ti
EC-359

qA
Disconnect and reconnect harness
connectors, then retest.
Trouble is not fixed.
Check ECM pin terminals for damage or
the connection of ECM harness connector.
Reconnect ECM harness connector and
retest.
INSPECTION END
Component Inspection
MASS AIR FLOW SENSOR
1. Turn ignition switch to ªONº position.
2. Start engine and warm it up sufficiently.
3. Check voltage between mass air flow sensor connector termi-
nalq
5and engine ground.
Condition Voltage V
Ignition switch ªONº position (Engine stopped.) Approx. 1.0
Idle (Engine is warmed-up sufficiently.) Approx. 2.2
4. If NG, remove mass air flow sensor from air duct. Check hot film
for damage or dust.
MEC957D
NEF669
H
H
H
DTC P0100 MASS AIR FLOW SENTD27Ti
Diagnostic Procedure (Cont'd)
EC-360

Component Description
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine cool-
ant temperature input. The sensor comprises a thermistor which is
sensitive to the change in temperature. The electrical resistance of
the thermistor decreases as temperature increases.

Engine coolant
temperature
ÉC (ÉF)Voltage
(V)Resistance
(kW)
þ10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.3 0.68 - 1.00
90 (194) 1.0 0.236 - 0.260
On Board Diagnosis Logic
DTC Malfunction is detected when ...Check Items
(Possible Cause)
P0115
0103IAn excessively high or low voltage from the sensor is
input to ECM.IHarness or connectors
(The sensor circuit is open or short-circuited.)
IEngine coolant 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 diagnostic test mode II (Self-diagnostic results).
SEF594K
SEF012P
DTC P0115 COOLANT TEMP SENTD27Ti
EC-361

Wiring Diagram
YEC144A
DTC P0115 COOLANT TEMP SENTD27Ti
EC-362

Diagnostic Procedure
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect engine coolant temperature
sensor harness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between engine coolant
temperature sensor connector terminal
q
1and engine ground with CONSULT-II
or tester.
Voltage:
Approximately 4.9V
OK
ENG
Check the following:
IHarness connectors
E151,F138(LHD model)
E151,M843(RHD
model)
IHarness for open or
short circuit between
ECM and engine coolant
temperature sensor.
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Check harness continuity between
engine coolant temperature sensor
connector terminalq
2and ECM terminal
334. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following:
IHarness connectors
E151,F138(LHD model)
E151,M843(RHD
model)
IHarness for open or
short circuit between
ECM and engine coolant
temperature sensor.
If NG, repair harness or
connectors.
CHECK COMPONENT
(Engine coolant temperature sensor).
Refer to EC-364.
OK
ENG
Replace engine coolant
temperature 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
NEF487
NEF670
H
H
H
H
H
H
DTC P0115 COOLANT TEMP SENTD27Ti
EC-363

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