2003 NISSAN X-TRAIL Service Repair Manual

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Page 769 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P2122, P2123 APP SENSOR
EC-391
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2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness
connector.

Page 770 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-392
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DTC P2122, P2123 APP SENSOR

6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace the accelerator pedal assembly.
2. Perform EC-45, "
Accelerator Pedal Released Position Learn

Page 771 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P2127, P2128 APP SENSOR
EC-393
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DTC P2127, P2128 APP SENSORPFP:18002
Component DescriptionEBS010UI
The accelerator pedal position sensor is installe

DTC P2127, P2128 APP SENSOR
EC-393
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DTC P2127, P2128 APP SENSORPFP:18002
Component DescriptionEBS010UI
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 ModeEBS010UJ
Specification data are reference values.
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage.
On Board Diagnosis LogicEBS010UK
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
DTC Confirmation ProcedureEBS010UL
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.
PBIB1741E
MONITOR ITEM CONDITION SPECIFICATION
ACCEL SEN1
Ignition switch: ON
(engine stopped)Accelerator pedal: Fully released 0.5 - 1.0V
Accelerator pedal: Fully depressed 4.0 - 4.7V
ACCEL SEN2*
Ignition switch: ON
(engine stopped)Accelerator pedal: Fully released 0.3 - 1.2V
Accelerator pedal: Fully depressed 3.9 - 4.8V
CLSD THL POS
Ignition switch: ONAccelerator pedal: Fully released ON
Accelerator pedal: Slightly depressed OFF
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2127
2127Accelerator pedal position
sensor 2 circuit low inputAn excessively low voltage from the APP sensor 2
is sent to ECM.
Harness or connectors
(APP sensor 2 circuit is open or
shorted.)
(TP sensor circuit is shorted.)
Accelerator pedal position sensor
(Accelerator pedal position sensor 2)
Electric throttle control actuator
(TP sensor 1 and 2) P2128
2128Accelerator pedal position
sensor 2 circuit high inputAn excessively high voltage from the APP sensor 2
is sent to ECM.
Engine operating condition in fail-safe mode
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 the opening speed of throttle valve to be shower than the normal condition.
So, the acceleration will be poor.

Page 772 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-394
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DTC P2127, P2128 APP SENSOR

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.

Page 773 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P2127, P2128 APP SENSOR
EC-395
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Wiring DiagramEBS010UM
TBWB0263E

Page 774 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-396
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DTC P2127, P2128 APP SENSOR

Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measu

Page 775 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P2127, P2128 APP SENSOR
EC-397
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Diagnostic ProcedureEBS010UN
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three

Page 776 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-398
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DTC P2127, P2128 APP SENSOR

2. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness
connector.
2. Turn ignition switch

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