2003 NISSAN X-TRAIL Electronic Repair Manual

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Page 1257 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0117, P0118 ECT SENSOR
EC-143
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EC
Wiring DiagramEBS00B35
TBWA0057E

Page 1258 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-144
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DTC P0117, P0118 ECT SENSOR
Diagnostic Procedure
EBS00B36
1.CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect engine coolant temperatur

Page 1259 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0117, P0118 ECT SENSOR
EC-145
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Component InspectionEBS00B37
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature

Page 1260 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-146
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DTC P0120 TP SENSOR
DTC P0120 TP SENSOR
PFP:16119
Component DescriptionEBS00B39
Electric Throttle Control Actuator consists of throttle control motor,
throttle position sen

EC-146
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DTC P0120 TP SENSOR
DTC P0120 TP SENSOR
PFP:16119
Component DescriptionEBS00B39
Electric Throttle Control Actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.
CONSULT-II Reference Value in Data Monitor ModeEBS00B3A
Specification data are reference values.
ECM Terminals and Reference ValueEBS00B3B
Specification data are reference values and are measured between each terminal and body 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.
PBIB0145E
MONITOR ITEM CONDITION SPECIFICATION
THRTL SEN1
THRTL SEN2
lIgnition switch: ON
(Engine stopped)Accelerator pedal: Fully released More than 0.36V
lShift lever:
D (A/T model)
1st (M/T model)Accelerator pedal: Fully depressed Less than 4.75V
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
58 B Sensors' ground[Engine is running]
lWarm-up condition
lIdle speedApproximately 0V
65 RSensor's power sup-
ply[Ignition switch “ON”]Approximately 5V
73 WThrottle position sen-
sor 1[Ignition switch "ON"]
lGear position is "D" (A/T model)
lGear position is "1st" (M/T model)
lAccelerator pedal fully releasedMore than 0.36V
[Ignition switch “ON”]
lGear position is "D" (A/T model)
lGear position is "1st" (M/T model)
lAccelerator pedal fully depressedLess than 4.75V

Page 1261 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0120 TP SENSOR
EC-147
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On Board Diagnosis LogicEBS00B3C
FAI L-S AFE MO DE
ECM enters in fail-safe mode when the malfunction A, B, C or D is detected.

DTC P0120 TP SENSOR
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On Board Diagnosis LogicEBS00B3C
FAI L-S AFE MO DE
ECM enters in fail-safe mode when the malfunction A, B, C or D is detected.
*: The ECM enters in the fail-safe mode when the normal signal is entered to the ECM after the malfunction C was detected.
DTC Confirmation ProcedureEBS00B3D
NOTE:
lPerform “PROCEDURE FOR MALFUNCTION A, B, C AND D” first. If the 1st trip DTC cannot be con-
firmed, perform “PROCEDURE FOR MALFUNCTION E". If the 1st trip DTC cannot be confirmed,
perform “PROCEDURE FOR MALFUNCTION F".
lIf “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and
wait at least 10 seconds before conducting the next test.
74 GThrottlepositionsen-
sor 2[Ignition switch "ON"]
lGear position is "D" (A/T model)
lGear position is "1st" (M/T model)
lAccelerator pedal fully releasedLess than 4.75V
[Ignition switch “ON”]
lGear position is "D" (A/T model)
lGear position is "1st" (M/T model)
lAccelerator pedal fully depressedMore than 0.36V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0120
0120Throttle position sensor
circuitA)An excessively low or high voltage from
the throttle position sensor 1 is sent to
ECM.
lHarness or connectors
(The throttle position sensor 1 or 2 circuit
is open or shorted.)
lElectric throttle control actuator B)An excessively low or high voltage from
the throttle position sensor 2 is sent to
ECM.
C)A difference between signals from sensor
1 and sensor 2 is out of the specified
range.
D)ECM detects a voltage of power source
for sensor is excessively low or high.
lHarness or connectors
(The throttle position sensor 1, 2, accel-
erator pedal position sensor 1, 2, mass
air flow sensor, power steering pressure
sensor or refrigerant pressure sensor cir-
cuit is shorted.)
lECM
(ECM pin terminal is bend or break.)
E)Closed throttle position learning value is
excessively low.
lElectric throttle control actuator
F)Closed throttle position learning is not
performed successfully, repeatedly.
Detected items Engine operation condition in fail-safe mode
Malfunction A The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle
position to be within +10 degrees.
The ECM regulates an opening speed of approx. 5 seconds to an opening of 10 degrees.
So, the acceleration will be poor. Malfunction B
Malfunction C*
Malfunction DECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx.
5 degrees) by the return spring.

Page 1262 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-148
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DTC P0120 TP SENSOR
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
PROCEDURE FOR MALFUNCTION A, B, C A

Page 1263 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0120 TP SENSOR
EC-149
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Wiring DiagramEBS00B3E
TBWA0058E

Page 1264 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-150
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DTC P0120 TP SENSOR
Diagnostic Procedure
EBS00B3F
MALFUNCTIONING A, B, C, AND D
1.RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine

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