2004 INFINITI QX56 Factory Service Manual

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Page 1353 of 3371

INFINITI QX56 2004 Factory Service Manual EC-162Revision: August 2007
DTC P0112, P0113 IAT SENSOR
2004 QX56
Wiring DiagramUBS00H1F
BBWA0879E

Page 1354 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0112, P0113 IAT SENSOR
EC-163
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Revision: August 20072004 QX56
Diagnostic ProcedureUBS00H1G
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighte

Page 1355 of 3371

INFINITI QX56 2004 Factory Service Manual EC-164Revision: August 2007
DTC P0112, P0113 IAT SENSOR
2004 QX56
3. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connec

Page 1356 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-165
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Revision: August 20072004 QX56
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionUBS00H1J
The engine coolant temperature sensor is

DTC P0117, P0118 ECT SENSOR
EC-165
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Revision: August 20072004 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 damage to the ECM's transistor. Use a ground other than ECM termi-
nals, 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.
SEF 5 94 K
Engine coolant temperature
°C (°F)Voltage* V Resistance kΩ
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
SEF 0 12 P
DTC
No.Trouble Diagnosis Name DTC Detecting Condition Possible Cause
P0117
0117Engine coolant temperature
sensor circuit low inputAn 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
0118Engine coolant temperature
sensor circuit high inputAn excessively high voltage from the sensor is
sent to ECM.
Detected items Engine operating condition in fail-safe mode
Engine coolant temper-
ature sensor circuitEngine 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.
ConditionEngine 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
START80°C (176°F)
Except as shown above40 - 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 1357 of 3371

INFINITI QX56 2004 Factory Service Manual EC-166Revision: August 2007
DTC P0117, P0118 ECT SENSOR
2004 QX56
DTC Confirmation ProcedureUBS00H1L
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF

Page 1358 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-167
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EC
Revision: August 20072004 QX56
Wiring DiagramUBS00H1M
BBWA11 61 E

Page 1359 of 3371

INFINITI QX56 2004 Factory Service Manual EC-168Revision: August 2007
DTC P0117, P0118 ECT SENSOR
2004 QX56
Diagnostic ProcedureUBS00H1N
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on t

Page 1360 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-169
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Revision: August 20072004 QX56
4. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness

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