2006 INFINITI QX56 Factory Service Manual

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Page 1401 of 3383

INFINITI QX56 2006 Factory Service Manual EC-190Revision: November 2009
DTC P0112, P0113 IAT SENSOR
2006 QX56
Diagnostic ProcedureUBS00H1G
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on

Page 1402 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0112, P0113 IAT SENSOREC-191
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Revision: November 2009 2006 QX56
3. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. D

Page 1403 of 3383

INFINITI QX56 2006 Factory Service Manual EC-192Revision: November 2009
DTC P0117, P0118 ECT SENSOR
2006 QX56
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionUBS00H1J
The engine coolant temperature sensor is used to detect the engin

EC-192Revision: November 2009
DTC P0117, P0118 ECT SENSOR
2006 QX56
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionUBS00H1J
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

*: This data is reference value and is measured between ECM terminal 73 (Engine
coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis LogicUBS00H1K
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
SEF594K
Engine coolant temperature°C (°F) Voltage* V
Resistance kΩ
– 10 (14) 4.47.0 - 11.4
20 (68) 3.52.1 - 2.9
50 (122) 2.20.68 - 1.00
90 (194) 0.90.236 - 0.260
SEF012P
DTC
No. Trouble Diagnosis Name
DTC Detecting Condition Possible Cause
P0117
0117 Engine coolant temperature
sensor circuit low input An excessively low voltage from the sensor is
sent to ECM.
Harness or connectors
(The sensor circuit is open or shorted.)
Engine coolant temperature sensor
P0118
0118 Engine coolant temperature
sensor circuit high input An excessively high voltage from the sensor is
sent to ECM.
Detected items
Engine operating condition in fail-safe mode
Engine coolant temper- ature sensor circuit Engine coolant temperature will be determined by ECM based on the time after turning ignition switch ON
or START.
CONSULT-II displays the engine coolant temperature decided by ECM.
Condition Engine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned ON or START 40°C (104 °F)
More than approx. 4 minutes after ignition ON or
START 80
°C (176 °F)
Except as shown above 40 - 80
°C (104 - 176°F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates
while engine is running.

Page 1404 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0117, P0118 ECT SENSOREC-193
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Revision: November 2009 2006 QX56
DTC Confirmation ProcedureUBS00H1L
NOTE:
If DTC Confirmation Procedure has been previously conducted, alwa

Page 1405 of 3383

INFINITI QX56 2006 Factory Service Manual EC-194Revision: November 2009
DTC P0117, P0118 ECT SENSOR
2006 QX56
Wiring DiagramUBS00H1M
BBWA1676E

Page 1406 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0117, P0118 ECT SENSOREC-195
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Revision: November 2009 2006 QX56
Diagnostic ProcedureUBS00H1N
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retigh

Page 1407 of 3383

INFINITI QX56 2006 Factory Service Manual EC-196Revision: November 2009
DTC P0117, P0118 ECT SENSOR
2006 QX56
4. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check har

Page 1408 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0117, P0118 ECT SENSOREC-197
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Revision: November 2009 2006 QX56
<Reference data>
2. If NG, replace engine coolant temperature sensor.
Removal and InstallationUBS00H1P
ENG

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