2004 INFINITI QX56 Factory Service Manual

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Page 1361 of 3371

INFINITI QX56 2004 Factory Service Manual EC-170Revision: August 2007
DTC P0117, P0118 ECT SENSOR
2004 QX56
<Reference data>
*: This data is reference value and is measured between ECM terminal 73
(Engine coolant temperature sensor) and groun

Page 1362 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0122, P0123 TP SENSOR
EC-171
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Revision: August 20072004 QX56
DTC P0122, P0123 TP SENSORPFP:16119
Component DescriptionUBS00H1Q
Electric throttle control actuator consists

DTC P0122, P0123 TP SENSOR
EC-171
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Revision: August 20072004 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 ITEM CONDITION SPECIFICATION
THRTL SEN1
THRTL SEN2*
Ignition switch: ON
(Engine stopped)
Shift lever: DAccelerator 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
0122Throttle position sensor
2 circuit low inputAn 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 P0123
0123Throttle position sensor
2 circuit high inputAn 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 1363 of 3371

INFINITI QX56 2004 Factory Service Manual EC-172Revision: August 2007
DTC P0122, P0123 TP SENSOR
2004 QX56
DTC Confirmation ProcedureUBS00H1T
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF a

Page 1364 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0122, P0123 TP SENSOR
EC-173
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Revision: August 20072004 QX56
Wiring DiagramUBS00H1U
BBWA11 67 E

Page 1365 of 3371

INFINITI QX56 2004 Factory Service Manual EC-174Revision: August 2007
DTC P0122, P0123 TP SENSOR
2004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals whe

Page 1366 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0122, P0123 TP SENSOR
EC-175
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Revision: August 20072004 QX56
2. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator h

Page 1367 of 3371

INFINITI QX56 2004 Factory Service Manual EC-176Revision: August 2007
DTC P0122, P0123 TP SENSOR
2004 QX56
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace the accelerator pedal assembly.
2. Perform EC-44, "
Accelerator Pedal Released Positio

Page 1368 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0122, P0123 TP SENSOR
EC-177
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Revision: August 20072004 QX56
Component InspectionUBS00H1W
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Pe

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