2003 NISSAN X-TRAIL Electronic Repair Manual

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Page 1593 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0120 TP SENSOR
EC-479
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EC
Wiring DiagramEBS00BGM
TBWA0058E

Page 1594 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-480
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DTC P0120 TP SENSOR
Diagnostic Procedure
EBS00BGN
MALFUNCTIONING A, B, C, AND D
1.RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engi

Page 1595 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0120 TP SENSOR
EC-481
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4.CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness cont

Page 1596 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-482
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DTC P0120 TP SENSOR
8.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. PerformEC-396, "
Throttle Valve Closed Position Le

Page 1597 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0120 TP SENSOR
EC-483
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5. Check voltage between ECM terminals 73 (TP sensor 1), 74 (TP
sensor 2) and engine ground under the following conditions.

Page 1598 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-484
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DTC P0121 APP SENSOR
DTC P0121 APP SENSOR
PFP:18002
Component DescriptionEBS00BGQ
The accelerator pedal position sensor is installed on the upper end
of the accelerator

EC-484
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DTC P0121 APP SENSOR
DTC P0121 APP SENSOR
PFP:18002
Component DescriptionEBS00BGQ
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has the two sensors. These sen-
sors are a kind of potentiometers which transform the accelerator
pedal position into output voltage, and emit the voltage signal to the
ECM. In addition, these sensors detect the opening and closing
speed of the accelerator pedal and feed the voltage signals to the
ECM. The ECM judges the current opening angle of the accelerator
pedal from these signals and controls the throttle control motor
based on these signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-
ation such as fuel cut.
CONSULT-II Reference Value in Data Monitor ModeEBS00BGR
Specification data are reference values.
ECM Terminals and Reference ValueEBS00BGS
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.
PBIB0146E
MONITOR ITEM CONDITION SPECIFICATION
ACCEL SEN1
lIgnition switch: ON
(engine stopped)Accelerator pedal: Fully released 0.41 - 0.71V
Accelerator pedal: Fully depressed More than 3.9V
ACCEL SEN2
lIgnition switch: ON
(engine stopped)Accelerator pedal: Fully released 0.15 - 0.97V
Accelerator pedal: Fully depressed More than 3.8V
CLSD THL POS
lIgnition switch: ONAccelerator pedal: Fully released ON
Accelerator pedal: Slightly depressed OFF
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
58 B Sensors' ground[Engine is running]
lWarm-up condition
lIdle speedApproximately 0V
64 OR/LAccelerator pedal
position sensor 2
power supply[Ignition switch “ON”]Approximately 2.5V
65 RSensor's power sup-
ply[Ignition switch “ON”]Approximately 5V
75 R/LAccelerator pedal
position sensor 1[Ignition switch "ON"]
lAccelerator pedal fully released0.41 - 0.71V
[Ignition switch "ON"]
lAccelerator pedal fully depressedMore than 3.9V

Page 1599 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0121 APP SENSOR
EC-485
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On Board Diagnosis LogicEBS00BGT
FAI L-S AFE MO DE
ECM enters in fail-safe mode when the malfunction is detected.
DTC Conf

DTC P0121 APP SENSOR
EC-485
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On Board Diagnosis LogicEBS00BGT
FAI L-S AFE MO DE
ECM enters in fail-safe mode when the malfunction is detected.
DTC Confirmation ProcedureEBS00BGU
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
WITH CONSULT-II
1. Turn ignition switch “ON”.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 1 second.
4. If 1st trip DTC is detected, go toEC-487, "
Diagnostic Procedure"
.
WITHOUT CONSULT-II
1. Start engine and let it idle for 1 second.
2. Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".
3. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
76 B/WAccelerator pedal
position sensor 2[Ignition switch "ON"]lAccelerator pedal fully released0.09 - 0.48V
[Ignition switch "ON"]
lAccelerator pedal fully depressedMore than 1.9V
86 LAccelerator pedal
position sensor 2
ground[Ignition switch “ON”]Approximately 0V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0121
0121Accelerator pedal posi-
tion sensor circuitA)An excessively low or high voltage from the
accelerator pedal position sensor 1 is sent to
ECM.
lHarness or connectors
(The accelerator pedal position
sensor 1 or 2 circuit is open or
shorted.)
lElectric throttle control actuator B)An excessively low or high voltage from the
accelerator pedal position sensor 2 is sent to
ECM.
C)A difference between signals from sensor 1 and
2 is out of the specified range.
Detected items Engine operating 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
SEF058Y

Page 1600 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-486
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DTC P0121 APP SENSOR
4. If 1st trip DTC is detected, go toEC-487, "Diagnostic Procedure".
Wiring DiagramEBS00BGV
TBWA0091E

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