2003 NISSAN X-TRAIL engine

DTC P0102, P0103 MAF SENSOR
EC-973
[YD (WITH EURO-OBD)]
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Diagnostic ProcedureEBS0118F
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws. Refer to EC-943, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
PBIB2020E

DTC P0102, P0103 MAF SENSOR
EC-975
[YD (WITH EURO-OBD)]
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5. CHECK MAFS INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between mass air flow sensor terminal 4 and ECM terminal 54. Refer to Wiring
Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK MASS AIR FLOW SENSOR
Refer to EC-975, "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace mass air flow sensor.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-936, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS0118G
MASS AIR FLOW SENSOR
1. Reconnect harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 54 (Mass air flow sensor
signal) and ground.
4. If the voltage is out of specification, disconnect MAF sensor har-
ness connector and connect it again.
Then repeat above check.
Removal and InstallationEBS0118H
MASS AIR FLOW SENSOR
Refer to EM-133, "AIR CLEANER AND AIR DUCT" . Continuity should exist.
Condition Voltage V
Ignition switch ON (Engine stopped.) Approx. 0.7
Idle (Engine is warmed up to normal
operating temperature.)1.8 - 2.3
2,000 rpm (Engine is warmed up to nor-
mal operating temperature.)2.5 - 3.0
SEF865T

EC-978
[YD (WITH EURO-OBD)]
DTC P0112, P0113 IAT SENSOR

Diagnostic ProcedureEBS0118M
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws. Refer to EC-943, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
PBIB2020E

DTC P0117, P0118 ECT SENSOR
EC-981
[YD (WITH EURO-OBD)]
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DTC P0117, P0118 ECT SENSORPFP:22630
DescriptionEBS0118P
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 coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

*: These data are reference values and measured between ECM terminal 51 (Engine
coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis LogicEBS0118Q
DTC Confirmation ProcedureEBS0118R
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If 1st trip DTC is detected, go to EC-984, "
Diagnostic Procedure"
.
SEF594K
Engine coolant tempera-
ture °C (°F)Voltage* (V) Resistance (kΩ)
−10 (14) 4.7 7.0 - 11.4
20 (68) 3.8 2.1 - 2.9
50 (122) 2.6 0.68 - 1.00
90 (194) 1.3 0.236 - 0.260
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0117Engine coolant tempera-
ture sensor circuit low
inputAn excessively low voltage from the sensor is
sent to ECM.

Harness or connectors
(The sensor circuit is open or
shorted.)

Engine coolant temperature sensor
P0118Engine coolant tempera-
ture sensor circuit high
inputAn excessively high voltage from the sensor is
sent to ECM.
SEF817Y

EC-984
[YD (WITH EURO-OBD)]
DTC P0117, P0118 ECT SENSOR

Diagnostic ProcedureEBS0118T
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws. Refer to EC-943, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
PBIB2020E

DTC P0117, P0118 ECT SENSOR
EC-985
[YD (WITH EURO-OBD)]
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2. CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect engine coolant temperature sensor harness connec-
tor.
2. Turn ignition switch ON.
3. Check voltage between ECT sensor terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connectors.
3. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECT sensor terminal 2 and ECM terminal 70. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-986, "
Component Inspection" .
OK or NG
OK >> GO TO 5.
NG >> Replace engine coolant temperature sensor.
5. CHECK INTERMITTENT INCIDENT
Refer to EC-936, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
PBIB1892E
Voltage: Approximately 5.3V
PBIB0152E
Continuity should exist.

EC-986
[YD (WITH EURO-OBD)]
DTC P0117, P0118 ECT SENSOR

Component InspectionEBS0118U
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

2. If NG, replace engine coolant temperature sensor.
Removal and InstallationEBS0118V
ENGINE COOLANT TEMPERATURE SENSOR
Refer to EM-196, "CYLINDER HEAD" .
PBIB2005E
Engine coolant temperature °C (°F) Resistance kΩ
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
SEF012P

DTC P0122, P0123 APP SENSOR
EC-987
[YD (WITH EURO-OBD)]
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DTC P0122, P0123 APP SENSORPFP:18002
DescriptionEBS0118W
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The ECM uses the signal to
determine the amount of fuel to be injected.
CONSULT-II Reference Value in Data Monitor ModeEBS0118X
Specification data are reference values.
*: These signals are converted by ECM internally. Thus, these differ from ECM terminals voltage.
ECM Terminals and Reference ValueEBS0118Y
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
PBIB1741E
MONITOR ITEM CONDITION SPECIFICATION
ACCEL POS SEN*

Ignition switch: ON
(Engine stopped)Accelerator pedal: Fully released 0.2 - 0.7V
Accelerator pedal: Fully depressed 3.9 - 4.9V
ACCEL SEN 2*

Ignition switch: ON
(Engine stopped)Accelerator pedal: Fully released 0.1 - 0.4V
Accelerator pedal: Fully depressed 1.9 - 2.4V
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
82 BAccelerator pedal position
sensor 1 power supply[Ignition switch ON]Approximately 5.3V
83 WAccelerator pedal position
sensor 1[Ignition switch ON]

Engine stopped

Accelerator pedal: Fully released0.5 - 1.0V
[Ignition switch ON]

Engine stopped

Accelerator pedal: Fully depressed4.2 - 5.2V
84 RAccelerator pedal position
sensor 1 ground[Ignition switch ON]Approximately 0.3V
85 —Sensor ground
(Accelerator pedal posi-
tion sensor shield circuit)[Ignition switch ON]Approximately 0.3V
90 LAccelerator pedal position
sensor 2 power supply[Ignition switch ON]Approximately 5.3V