check engine NISSAN TERRANO 2004 Service Repair Manual

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CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM connector terminals
104,105,
106and engine ground. Refer to wir-
ing diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG Check the following:
IEngine ground connec-
tions
I Harness for open or
short-circuit between
ECM and engine ground
If NG, repair harness or
connectors.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector.
INSPECTION END
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TROUBLE DIAGNOSIS FOR POWER SUPPLYTD27Ti
Diagnostic Procedure (Cont'd)
EC-378
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Component Description
MASS AIR FLOW SENSOR (MAFS)
The mass air flow sensor measures the intake air flow rate by
monitoring a part of the entire flow. Measurements are made by the
ECM which receives electrical signals from the mass air flow sen-
sor which is proportional to the amount of heat emitted from the hot
wire placed in the stream of the intake air.
When intake air flows into the intake manifold through a route
around the hot wire, the heat generated by the hot wire is carried
away by the air flow. The amount of heat detected depends on the
volume of air flow. The temperature of the hot wire is automatically
controlled to maintain it within a finite range regardless of the air
flow rate by regulating the current supplied to the hot wire.
The ECM monitors the air flow by means of the corresponding
electric change.
On Board Diagnosis Logic
DTCMalfunction is detected when... Check Items
(Possible Cause)
P0100
0102 I
An excessively high or low voltage from the sensor is
entered to ECM. I
Harness or connectors
(The sensor circuit is open or short-circuited.)
I Mass air flow sensor
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and wait for at least 15 seconds.
WITHOUT CONSULT-II
1) Start engine and wait for at least 15 seconds.
2) Turn ignition switch off, wait for at least 5 seconds and then turn
on.
3) Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
SEF781K
SEF817Y
DTC P0100 MASS AIR FLOW SENTD27Ti
EC-379
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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 terminal q
2and
engine ground with CONSULT-II or
tester.
Voltage: Battery positive voltage
OK
ENG Check the following:
I10A fuse
I Harness continuity
between ECM relay (coil
and load side) connector
and battery supply
I Harness connectors
F100,M775(RHD mod-
els)
I Harness continuity
between ECM relay con-
nector and Mass Air
Flow Sensor Connector.
If NG, replace 10A fuse or
repair or replace harness
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 terminal q
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,M775(RHD mod-
els)
I Harness 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 terminal q
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,M775(RHD mod-
els)
I Harness 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 terminal q
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,M775(RHD mod-
els)
I Harness 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-383.
OK
ENG Replace mass air flow sen-
sor.
qA
NEF664
NEF591
NEF352
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DTC P0100 MASS AIR FLOW SENTD27Ti
EC-382
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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
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DTC P0100 MASS AIR FLOW SENTD27Ti
Diagnostic Procedure (Cont'd)
EC-383
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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 coolanttemperature ÉC (ÉF) Voltage
(V) Resistance
(kW )
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
0103 I
An excessively high or low voltage from the sensor is
input to ECM. I
Harness or connectors
(The sensor circuit is open or short-circuited.)
I Engine 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-384
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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)
I Harness 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 terminal q
2and ECM termi-
nal
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)
I Harness 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-387.
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
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DTC P0115 COOLANT TEMP SENTD27Ti
EC-386
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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-387
http://vnx.su/

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 terminal q
2and
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-
nal q
4and 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 terminal q
3.
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-394.
OK
ENGReplace 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
YEC698A
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DTC P0120 ACCEL POS SENSORTD27Ti
EC-391
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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 releasedApproximately 0V
Accelerator pedal fully depressed Approximately 5V
NG
EOK INSPECTION END
qA
MEC969D
MEC955D
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DTC P0120 ACCEL POS SENSORTD27Ti
Diagnostic Procedure (Cont'd)
EC-392
http://vnx.su/

Diagnostic Procedure
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect electrical fuel injection pump harness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between electronic con- trol fuel injection pump (Fuel tempera-
ture sensor) harness connector termi-
nal q
6and engine ground with CON-
SULT-II or tester.
Voltage: Approximately 4.9V
OK
ENG Check the following:
IHarness for open or
short-circuit between
ECM and electronic con-
trol fuel injection pump
(fuel temperature sen-
sor)
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Check harness continuity between electronic control fuel injection pump
(fuel temperature sensor) connector
terminal q
5and ECM connector
terminal
335. Refer to wiring dia-
gram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG Check the following:
IHarness for open or
short-circuit between
ECM and electronic con-
trol fuel injection pump
(fuel temperature sen-
sor).
If NG, repair harness or
connectors.
CHECK COMPONENT
[Electronic control fuel injection pump
(Fuel temperature sensor)].
Refer to ªCOMPONENT INSPECTIONº on
page EC-398.
OK
ENG Have the injection pump
assembly serviced by an
authorised service repre-
sentative.
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
YEC248A
YEC254A
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DTC P0180 FUEL TEMP SENSORTD27Ti
EC-397
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