2007 INFINITI QX56 Factory Service Manual

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Page 1297 of 3061

INFINITI QX56 2007 Factory Service Manual EC-214
< SERVICE INFORMATION >
DTC P0122, P0123 TP SENSOR
1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch ON.
3. Check voltage between electric throttle con

Page 1298 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0122, P0123 TP SENSOR
EC-215
< SERVICE INFORMATION >
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>>INSPECTION END
7.CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch

Page 1299 of 3061

INFINITI QX56 2007 Factory Service Manual EC-216
< SERVICE INFORMATION >
DTC P0122, P0123 TP SENSOR
5. Check voltage between ECM terminals 50 (TP sensor 1 signal),
69 (TP sensor 2 signal) and ground under the following condi-
tions.
6. If NG,

Page 1300 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0125 ECT SENSOR
EC-217
< SERVICE INFORMATION >
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DTC P0125 ECT SENSOR
Component DescriptionINFOID:0000000003531719
NOTE:
If DTC P0125 is displayed with P0117 or P011

DTC P0125 ECT SENSOR
EC-217
< SERVICE INFORMATION >
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DTC P0125 ECT SENSOR
Component DescriptionINFOID:0000000003531719
NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. Refer to EC-205
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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 LogicINFOID:0000000003531720
DTC Confirmation ProcedureINFOID:0000000003531721
CAUTION:
Be careful not to overheat engine.
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.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Check that “COOLAN TEMP/S” is above 31°C (88°F).
If it is above 31°C (88°F), the test result will be OK.
If it is below 31°C (88°F), go to following step.
SEF594K
Engine coolant temperature
°C (°F)Voltage* V Resistance kΩ
–10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0125
0125Insufficient engine coolant
temperature for closed loop
fuel control• Voltage sent to ECM from the sensor is not
practical, even when some time has passed
after starting the engine.
• Engine coolant temperature is insufficient for
closed loop fuel control.• Harness or connectors
(High resistance in the circuit)
• Engine coolant temperature sensor
•Thermostat

Page 1301 of 3061

INFINITI QX56 2007 Factory Service Manual EC-218
< SERVICE INFORMATION >
DTC P0125 ECT SENSOR
4. Start engine and run it for 65 minutes at idle speed.
If “COOLAN TEMP/S” increases to more than 31°C (88°F)
within 65 minutes, stop engine

Page 1302 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0125 ECT SENSOR
EC-219
< SERVICE INFORMATION >
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1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.
<Reference d

Page 1303 of 3061

INFINITI QX56 2007 Factory Service Manual EC-220
< SERVICE INFORMATION >
DTC P0127 IAT SENSOR
DTC P0127 IAT SENSOR
Component DescriptionINFOID:0000000003531725
The intake air temperature sensor is built into mass air flow sensor.
The sensor d

Page 1304 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0127 IAT SENSOR
EC-221
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b. Select “DATA MONITOR” mode with CONSULT-II.
c. Check the engine coolant temperature.
d. If the engine coolant

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