2011 INFINITI QX56 Factory Service Manual

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Page 2241 of 5598

INFINITI QX56 2011 Factory Service Manual
P0117, P0118 ECT SENSOREC-217
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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EC
NP
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P0117, P0118 ECT SENSOR
DTC LogicINFOID:0000000006217798
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDUR

Page 2242 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-218
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0117, P0118 ECT SENSOR
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors

Page 2243 of 5598

INFINITI QX56 2011 Factory Service Manual
P0122, P0123 TP SENSOREC-219
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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G H
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EC
NP
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P0122, P0123 TP SENSOR
DTC LogicINFOID:0000000006217801
DTC DETECTION LOGIC
NOTE:
If DTC P0122 or P0123

P0122, P0123 TP SENSOREC-219
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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P0122, P0123 TP SENSOR
DTC LogicINFOID:0000000006217801
DTC DETECTION LOGIC
NOTE:
If DTC P0122 or P0123 is displayed with DTC P
0643, perform the trouble diagnosis for DTC P0643.
Refer to EC-381, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is 8 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-219, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217802
1.CHECK THROTTLE POSITION SEN SOR 2 POWER SUPPLY CIRCUIT
1. Disconnect electric throttle c ontrol actuator harness connector.
2. Turn ignition switch ON.
3. Check the voltage between electric throttle control actuator harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
2.CHECK THROTTLE POSITI ON SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0122 TP SEN 2/CIRC-B1
(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.)
Electric throttle control actuator (TP sensor 2)
P0123 TP SEN 2/CIRC-B1
(Throttle position sensor 2
circuit high input) An excessively high voltage from the TP
sensor 2 is sent to ECM.
Electric throttle control actuator
Ground Voltage
Connector Terminal
F66 2 Ground Approx. 5 V
Revision: 2010 May2011 QX56

Page 2244 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-220
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0122, P0123 TP SENSOR
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circui

Page 2245 of 5598

INFINITI QX56 2011 Factory Service Manual
P0122, P0123 TP SENSOREC-221
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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EC
NP
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Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE ELECTRIC THROTTLE CONTR

Page 2246 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-222
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0125 ECT SENSOR
P0125 ECT SENSOR
DTC LogicINFOID:0000000006288280
DTC DETECTION LOGIC
NOTE:
If DTC P0125 is displayed with P0117 or P0118,
first perform the

Page 2247 of 5598

INFINITI QX56 2011 Factory Service Manual
P0125 ECT SENSOREC-223
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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EC
NP
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NO >> Replace engine coolant temperature sensor.
2.CHECK THERMOSTAT OPERATION
When the engine is cold [lower

Page 2248 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-224
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0127 IAT SENSOR
P0127 IAT SENSOR
DTC LogicINFOID:0000000006288283
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OF

EC-224
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0127 IAT SENSOR
P0127 IAT SENSOR
DTC LogicINFOID:0000000006288283
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road
test is expected to be easier, it is unnecessary to lift the vehicle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
1. Wait until engine coolant temperature is less than 90 °C (194 °F)
- Turn ignition switch ON.
- Select “DATA MONITOR” mode with CONSULT-III.
- Check the engine coolant temperature.
- If the engine coolant temperature is not less than 90 °C (194 °F), turn ignition switch OFF and cool down
engine.
NOTE:
Perform the following steps before engine coolant temperature is above 90 °C (194 °F).
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Start engine.
5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
CAUTION:
Always drive vehicle at a safe speed.
6. Check 1st trip DTC.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES >> Proceed to EC-224, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006288284
1.CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to EC-225, "
Component Inspection (Intake Air Temperature Sensor)".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace mass air flow sensor (with intake air temperature sensor).
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0127 IAT SENSOR-B1
(Intake air temperature too
high) Rationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage signal
from engine coolant temperature sensor. Harness or connectors
(The intake air temperature sensor
circuit is open or shorted)
Intake air temperature sensor
Revision: 2010 May2011 QX56

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