2005 INFINITI QX4 Factory Service Manual

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Page 1801 of 3419

INFINITI QX4 2005 Factory Service Manual EC-610Revision: October 2005
DTC P2135 TP SENSOR
2005 QX56
Component InspectionUBS00HCQ
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform EC-90, "
Throttle Valve Cl

Page 1802 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P2138 APP SENSOR
EC-611
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DTC P2138 APP SENSORPFP:18002
Component DescriptionUBS00HCS
The accelerator pedal position sensor is installed on

DTC P2138 APP SENSOR
EC-611
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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 P1229, first perform the trouble diagnosis for DTC P1229. Refer to
EC-454, "
DTC P1229 SENSOR POWER SUPPLY" .
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 0.5 - 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
2138Accelerator pedal position
sensor circuit range/per-
formance problemRationally 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 1803 of 3419

INFINITI QX4 2005 Factory Service Manual EC-612Revision: October 2005
DTC P2138 APP SENSOR
2005 QX56
DTC Confirmation ProcedureUBS00HCV
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wa

Page 1804 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P2138 APP SENSOR
EC-613
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Revision: October 20052005 QX56
Wiring DiagramUBS00HCW
BBWA1709E

Page 1805 of 3419

INFINITI QX4 2005 Factory Service Manual EC-614Revision: October 2005
DTC P2138 APP SENSOR
2005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when mea

Page 1806 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P2138 APP SENSOR
EC-615
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Revision: October 20052005 QX56
2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness
connector

Page 1807 of 3419

INFINITI QX4 2005 Factory Service Manual EC-616Revision: October 2005
DTC P2138 APP SENSOR
2005 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 N

Page 1808 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P2138 APP SENSOR
EC-617
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Revision: October 20052005 QX56
10. CHECK ACCELERATOR PEDAL POSITION SENSOR
Refer to EC-618, "
Component Inspection" .
OK or NG
OK >> GO TO 12.
NG

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