2007 INFINITI QX56 Factory Service Manual

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Page 1289 of 3061

INFINITI QX56 2007 Factory Service Manual EC-206
< SERVICE INFORMATION >
DTC P0117, P0118 ECT SENSOR
DTC Confirmation Procedure
INFOID:0000000003531706
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition sw

Page 1290 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-207
< SERVICE INFORMATION >
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Wiring DiagramINFOID:0000000003531707
Diagnosis ProcedureINFOID:0000000003531708
1.CHECK GROUND CONNECTIONS
1

Page 1291 of 3061

INFINITI QX56 2007 Factory Service Manual EC-208
< SERVICE INFORMATION >
DTC P0117, P0118 ECT SENSOR
Refer to EC-143, "Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK ECT SENSOR POWER SUPPLY CIR

Page 1292 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-209
< SERVICE INFORMATION >
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4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT

Page 1293 of 3061

INFINITI QX56 2007 Factory Service Manual EC-210
< SERVICE INFORMATION >
DTC P0122, P0123 TP SENSOR
DTC P0122, P0123 TP SENSOR
Component DescriptionINFOID:0000000003531711
Electric throttle control actuator consists of throttle control motor,

EC-210
< SERVICE INFORMATION >
DTC P0122, P0123 TP SENSOR
DTC P0122, P0123 TP SENSOR
Component DescriptionINFOID:0000000003531711
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 ModeINFOID:0000000003531712
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 LogicINFOID:0000000003531713
These self-diagnoses have the one trip detection logic.
FA I L - S A F E M O D E
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000003531714
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V at idle.
WITH CONSULT-II
1. Turn ignition switch ON.
PBIB0145E
MONITOR ITEM CONDITION SPECIFICATION
THRTL SEN 1
THRTL SEN 2*• Ignition switch: ON
(Engine stopped)
• Selector 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
(APP sensor 2) P0123
0123Throttle position sensor
2 circuit high inputAn excessively high voltage from the TP sensor
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 1294 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0122, P0123 TP SENSOR
EC-211
< SERVICE INFORMATION >
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2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 1 second.
4. If DTC is

Page 1295 of 3061

INFINITI QX56 2007 Factory Service Manual EC-212
< SERVICE INFORMATION >
DTC P0122, P0123 TP SENSOR
Wiring Diagram
INFOID:0000000003531715
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do

Page 1296 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0122, P0123 TP SENSOR
EC-213
< SERVICE INFORMATION >
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Diagnosis ProcedureINFOID:0000000003531716
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen a

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