2006 INFINITI QX56 Factory Service Manual

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Page 1409 of 3383

INFINITI QX56 2006 Factory Service Manual EC-198Revision: November 2009
DTC P0122, P0123 TP SENSOR
2006 QX56
DTC P0122, P0123 TP SENSORPFP:16119
Component DescriptionUBS00H1Q
Electric throttle control actuator consists of throttle control mot

EC-198Revision: November 2009
DTC P0122, P0123 TP SENSOR
2006 QX56
DTC P0122, P0123 TP SENSORPFP:16119
Component DescriptionUBS00H1Q
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.
CONSULT-II Reference Value in Data Monitor ModeUBS00H1R
Specification data are reference values.
*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.
On Board Diagnosis LogicUBS00H1S
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.
PBIB0145E
MONITOR ITEMCONDITION SPECIFICATION
THRTL SEN 1
THRTL SEN 2*
Ignition switch: ON
(Engine stopped)
Selector lever: D Accelerator pedal: Fully released More than 0.36V
Accelerator pedal: Fully depressed Less than 4.75V
DTC No. Trouble diagnosis name
DTC detecting condition Possible cause
P0122
0122 Throttle position sensor
2 circuit low input An excessively low voltage from the TP sensor
2 is sent to ECM.
Harness or connectors
(TP sensor 2 circuit is open or shorted.)
(APP sensor 2 circuit is shorted.)
Electric throttle control actuator
(TP sensor 2)
Accelerator pedal position sensor
(APP sensor 2)
P0123
0123
Throttle position sensor
2 circuit high input An excessively high voltage from the TP sen-
sor 2 is sent to ECM.
Engine operation 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 1410 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0122, P0123 TP SENSOREC-199
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Revision: November 2009 2006 QX56
DTC Confirmation ProcedureUBS00H1T
NOTE:
If DTC Confirmation Procedure has been previously conducted, alway

Page 1411 of 3383

INFINITI QX56 2006 Factory Service Manual EC-200Revision: November 2009
DTC P0122, P0123 TP SENSOR
2006 QX56
Wiring DiagramUBS00H1U
BBWA1677E

Page 1412 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0122, P0123 TP SENSOREC-201
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Revision: November 2009 2006 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not

Page 1413 of 3383

INFINITI QX56 2006 Factory Service Manual EC-202Revision: November 2009
DTC P0122, P0123 TP SENSOR
2006 QX56
2. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector.
2. Tur

Page 1414 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0122, P0123 TP SENSOREC-203
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Revision: November 2009 2006 QX56
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace the accelerator pedal assembly.
2. Perform EC-78, "
Accel

Page 1415 of 3383

INFINITI QX56 2006 Factory Service Manual EC-204Revision: November 2009
DTC P0122, P0123 TP SENSOR
2006 QX56
Component InspectionUBS00H1W
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform EC-78, "
Throttle

Page 1416 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0125 ECT SENSOREC-205
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Revision: November 2009 2006 QX56
DTC P0125 ECT SENSORPFP:22630
Component DescriptionUBS00H1Y
NOTE:
If DTC P0125 is displayed with P0117 or P0118,

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