2006 INFINITI QX56 Factory Service Manual

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Page 1777 of 3383

INFINITI QX56 2006 Factory Service Manual EC-566Revision: November 2009
DTC P2135 TP SENSOR
2006 QX56
Component InspectionUBS00HCQ
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform EC-78, "
Throttle Valve C

Page 1778 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P2138 APP SENSOREC-567
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Revision: November 2009 2006 QX56
DTC P2138 APP SENSORPFP:18002
Component DescriptionUBS00HCS
The accelerator pedal position sensor is installed on

DTC P2138 APP SENSOREC-567
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Revision: November 2009 2006 QX56
DTC P2138 APP SENSORPFP:18002
Component DescriptionUBS00HCS
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 ModeUBS00HCT
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 LogicUBS00HCU
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-460, "
DTC P0643 SENSOR POWER SUPPLY" .
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 condition Possible cause
P2138
2138 Accelerator pedal position
sensor circuit range/per-
formance Rationally incorrect voltage is sent to ECM
compared with the signals from APP sensor 1
and APP sensor 2.
Harness or connector
(APP sensor 1 and 2 circuit is open or
shorted.)
(TP sensor circuit is shorted.)
Accelerator pedal position sensor 1 and 2
Electric throttle control actuator
(TP sensor)
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 1779 of 3383

INFINITI QX56 2006 Factory Service Manual EC-568Revision: November 2009
DTC P2138 APP SENSOR
2006 QX56
DTC Confirmation ProcedureUBS00HCV
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and w

Page 1780 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P2138 APP SENSOREC-569
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Revision: November 2009 2006 QX56
Wiring DiagramUBS00HCW
BBWA1709E

Page 1781 of 3383

INFINITI QX56 2006 Factory Service Manual EC-570Revision: November 2009
DTC P2138 APP SENSOR
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when me

Page 1782 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P2138 APP SENSOREC-571
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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 connecto

Page 1783 of 3383

INFINITI QX56 2006 Factory Service Manual EC-572Revision: November 2009
DTC P2138 APP SENSOR
2006 QX56
5. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals
OK or

Page 1784 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P2138 APP SENSOREC-573
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Revision: November 2009 2006 QX56
10. CHECK ACCELERATOR PEDAL POSITION SENSOR
Refer to EC-574, "
Component Inspection" .
OK or NG
OK >> GO TO 12.

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