2003 NISSAN X-TRAIL Electronic Repair Manual

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Page 1265 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0120 TP SENSOR
EC-151
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EC
4.CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continu

Page 1266 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-152
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DTC P0120 TP SENSOR
8.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. PerformEC-31, "
Throttle Valve Closed Position Learni

Page 1267 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0120 TP SENSOR
EC-153
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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.
6.

Page 1268 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-154
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DTC P0121 APP SENSOR
DTC P0121 APP SENSOR
PFP:18002
Component DescriptionEBS00B3I
The accelerator pedal position sensor is installed on the upper end
of the accelerator ped

EC-154
[QR (WITH EURO-OBD)]
DTC P0121 APP SENSOR
DTC P0121 APP SENSOR
PFP:18002
Component DescriptionEBS00B3I
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 two sensors. These sensors
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 ModeEBS00B3J
Specification data are reference values.
ECM Terminals and Reference ValueEBS00B3K
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 1269 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0121 APP SENSOR
EC-155
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On Board Diagnosis LogicEBS00B3L
FAI L-S AFE MO DE
ECM enters in fail-safe mode when the malfunction is detected.
DTC Confirm

DTC P0121 APP SENSOR
EC-155
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On Board Diagnosis LogicEBS00B3L
FAI L-S AFE MO DE
ECM enters in fail-safe mode when the malfunction is detected.
DTC Confirmation ProcedureEBS00B3M
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-157, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “With CONSULT-II” above.
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 1270 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-156
[QR (WITH EURO-OBD)]
DTC P0121 APP SENSOR
Wiring Diagram
EBS00B3N
TBWA0091E

Page 1271 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0121 APP SENSOR
EC-157
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Diagnostic ProcedureEBS00B3O
1.RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine grou

Page 1272 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-158
[QR (WITH EURO-OBD)]
DTC P0121 APP SENSOR
4.CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between APP sensor terminal 1, 3 an

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