Infiniti QX56 (JA60). Manual — part 369
EC-128
< COMPONENT DIAGNOSIS >
[VK56DE]
P0122, P0123 TP SENSOR
>> INSPECTION END
Component Inspection
INFOID:0000000005149140
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform
EC-18, "Throttle Valve Closed Position Learning"
.
3. Turn ignition switch ON.
4. Set selector lever to D position.
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, replace electric throttle control actuator and go to the next
step.
7. Perform
EC-18, "Throttle Valve Closed Position Learning"
.
8. Perform
EC-18, "Idle Air Volume Learning"
Terminal
Accelerator pedal
Voltage
50
(Throttle position sensor 1)
Fully released
More than 0.36 V
Fully depressed
Less than 4.75 V
69
(Throttle position sensor 2)
Fully released
Less than 4.75 V
Fully depressed
More than 0.36 V
PBIB1530E
P0125 ECT SENSOR
EC-129
< COMPONENT DIAGNOSIS >
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P0125 ECT SENSOR
Component Description
INFOID:0000000005149141
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.
<Reference data>
*: 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 Logic
INFOID:0000000005149142
NOTE:
• If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to
129, "DTC Confirmation Procedure"
.
• If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117,
P0118. Refer to
EC-122, "DTC Confirmation Procedure"
.
DTC Confirmation Procedure
INFOID:0000000005149143
CAUTION:
Be careful not to overheat engine.
1. If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT-III.
SEF594K
Engine coolant temperature
°C (°F)]
Voltage* (V)
Resistance (k
Ω)
–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
0125
Insufficient 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
EC-130
< COMPONENT DIAGNOSIS >
[VK56DE]
P0125 ECT SENSOR
4. 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.
5. 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 because
the test result will be OK.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000005149144
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-130, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace engine coolant temperature sensor.
3.
CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70
°C (158°F)] condition, grasp lower radiator hose and confirm the engine
coolant does not flow.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace thermostat. Refer to
CO-22, "Removal and Installation"
4.
CHECK INTERMITTENT INCIDENT
GI-35, "How to Check Terminal"
and
GI-38, "Intermittent Incident"
EC-435, "Wiring Diagram - ENGINE CONTROL SYSTEM -"
>> INSPECTION END
Component Inspection
INFOID:0000000005149145
ENGINE COOLANT TEMPERATURE SENSOR
BBIA0354E
P0125 ECT SENSOR
EC-131
< COMPONENT DIAGNOSIS >
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1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.
2. If NG, replace engine coolant temperature sensor.
PBIB2005E
Engine coolant temperature
°C (°F)]
Resistance (k
Ω)
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
SEF012P
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