2008 NISSAN LATIO Service Repair Manual

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Page 1553 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P2122, P2123 APP SENSOR
EC-479
< SERVICE INFORMATION >
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>>INSPECTION END
7.CHECK INTERMITTENT INCIDENT
Refer to EC-136
.
>>INSPECTION END
Component InspectionINFOID:

Page 1554 of 2771

NISSAN LATIO 2008 Service Repair Manual EC-480
< SERVICE INFORMATION >
DTC P2127, P2128 APP SENSOR
DTC P2127, P2128 APP SENSOR
Component DescriptionINFOID:0000000001703017
The accelerator pedal position sensor is installed on the upper end

EC-480
< SERVICE INFORMATION >
DTC P2127, P2128 APP SENSOR
DTC P2127, P2128 APP SENSOR
Component DescriptionINFOID:0000000001703017
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 ModeINFOID:0000000001703018
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 LogicINFOID:0000000001703019
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
PBIB1741E
MONITOR ITEM CONDITION SPECIFICATION
ACCEL SEN 1• Ignition switch: ON
(Engine stopped)Accelerator pedal: Fully released 0.6 - 0.9V
Accelerator pedal: Fully depressed 4.0 - 4.8V
ACCEL SEN 2*• Ignition switch: ON
(Engine stopped)Accelerator pedal: Fully released 0.6 - 0.9V
Accelerator pedal: Fully depressed 3.9 - 4.8V
CLSD THL POS• Ignition switch: ON
(Engine stopped)Accelerator 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.)
[Crankshaft position sensor (POS) circuit
is shorted.]
(EVAP control system pressure sensor
circuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
• EVAP control system pressure sensor
• Accelerator pedal position sensor
(APP sensor 2)
• Crankshaft position sensor (POS)
• Refrigerant pressure sensor 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 the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.

Page 1555 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P2127, P2128 APP SENSOR
EC-481
< SERVICE INFORMATION >
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DTC Confirmation ProcedureINFOID:0000000001703020
NOTE:
If DTC Confirmation Procedure has been previously con

Page 1556 of 2771

NISSAN LATIO 2008 Service Repair Manual EC-482
< SERVICE INFORMATION >
DTC P2127, P2128 APP SENSOR
Wiring Diagram
INFOID:0000000001703021
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do

Page 1557 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P2127, P2128 APP SENSOR
EC-483
< SERVICE INFORMATION >
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Diagnosis ProcedureINFOID:0000000001703022
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen

Page 1558 of 2771

NISSAN LATIO 2008 Service Repair Manual EC-484
< SERVICE INFORMATION >
DTC P2127, P2128 APP SENSOR
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator ped

Page 1559 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P2127, P2128 APP SENSOR
EC-485
< SERVICE INFORMATION >
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• Refrigerant pressure sensor (Refer to MTC-22.)
OK or NG
OK >> GO TO 10.
NG >> Replace malfunctioning comp

Page 1560 of 2771

NISSAN LATIO 2008 Service Repair Manual EC-486
< SERVICE INFORMATION >
DTC P2127, P2128 APP SENSOR
3. Check voltage between ECM terminals 110 (APP sensor 1 sig-
nal), 103 (APP sensor 2 signal) and ground under the following
conditions.
4. I

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