2006 INFINITI QX56 Factory Service Manual

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Page 1761 of 3383

INFINITI QX56 2006 Factory Service Manual EC-550Revision: November 2009
DTC P2122, P2123 APP SENSOR
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals

Page 1762 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P2122, P2123 APP SENSOREC-551
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Revision: November 2009 2006 QX56
2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness c

Page 1763 of 3383

INFINITI QX56 2006 Factory Service Manual EC-552Revision: November 2009
DTC P2122, P2123 APP SENSOR
2006 QX56
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace the accelerator pedal assembly.
2. Perform EC-78, "
Accelerator Pedal Released Pos

Page 1764 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P2127, P2128 APP SENSOREC-553
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Revision: November 2009 2006 QX56
DTC P2127, P2128 APP SENSORPFP:18002
Component DescriptionUBS00HCC
The accelerator pedal position sensor i

DTC P2127, P2128 APP SENSOREC-553
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Revision: November 2009 2006 QX56
DTC P2127, P2128 APP SENSORPFP:18002
Component DescriptionUBS00HCC
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 ModeUBS00HCD
Specification data are reference values.
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differ from ECM terminal voltage.
On Board Diagnosis LogicUBS00HCE
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 ITEMCONDITION SPECIFICATION
ACCEL SEN 1
Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.5 - 1.0V
Accelerator pedal: Fully depressed 4.2 - 4.8V
ACCEL SEN 2*
Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.5 - 1.0V
Accelerator pedal: Fully depressed 4.2 - 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 conditionPossible cause
P2127
2127 Accelerator pedal position
sensor 2 circuit low input An 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)
P2128
2128
Accelerator pedal position
sensor 2 circuit high input An 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 1765 of 3383

INFINITI QX56 2006 Factory Service Manual EC-554Revision: November 2009
DTC P2127, P2128 APP SENSOR
2006 QX56
DTC Confirmation ProcedureUBS00HCF
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OF

Page 1766 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P2127, P2128 APP SENSOREC-555
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Revision: November 2009 2006 QX56
Wiring DiagramUBS00HCG
BBWA1707E

Page 1767 of 3383

INFINITI QX56 2006 Factory Service Manual EC-556Revision: November 2009
DTC P2127, P2128 APP SENSOR
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals

Page 1768 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P2127, P2128 APP SENSOREC-557
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Revision: November 2009 2006 QX56
2. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness

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