Nissan Frontier. Instruction — part 402
P0116 ECT SENSOR
EC-179
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
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G
H
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EC
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YES
>> INSPECTION END
NO
>> Proceed to
.
3.
PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure before conducting the next test.
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:
• Before performing the following procedure, do not add fuel.
• Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
• Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 60 minutes.
2. Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between
−10°C (14°F) and 35°C (95°F).
3. Turn ignition switch OFF and soak the vehicle for 12 hours.
CAUTION:
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4. Start engine and let it idle for 5 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Component Function Check
INFOID:0000000009480825
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect ECT sensor harness connector.
3. Remove ECT sensor. Refer to
CO-28, "Removal and Installation"
4. Check resistance between ECT sensor terminals by heating
with hot water as shown in the figure.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Proceed to
.
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Terminals
Condition
Resistance (k
Ω)
1 and 2
Temperature [
°C (°F)]
20 (68)
2.10 – 2.90
50 (122)
0.68 – 1.00
90 (194)
0.236 – 0.260
JMBIA0080ZZ
EC-180
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0116 ECT SENSOR
Diagnosis Procedure
INFOID:0000000009480826
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
Check ECT sensor. Refer to
EC-180, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace ECT sensor. Refer to
CO-28, "Removal and Installation"
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009480827
ENGINE COOLANT TEMPERATURE SENSOR
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. Refer to
28, "Removal and Installation"
.
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
P0117, P0118 ECT SENSOR
EC-181
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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EC
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P0117, P0118 ECT SENSOR
Component Description
INFOID:0000000009480828
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 46 (Engine
coolant temperature sensor) and 52 (sensor ground).
CAUTION:
Never 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:0000000009480829
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When this malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
SEF594K
Engine coolant [
°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
P0117
0117
Engine coolant temperature
sensor circuit low input
An excessively low voltage from the sen-
sor 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 sen-
sor 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 following condition.
CONSULT displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT display)
Just as ignition switch is turned ON or START
40
°C (104°F)
Approx. 4 minutes or more after engine starting.
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.
EC-182
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0117, P0118 ECT SENSOR
DTC Confirmation Procedure
INFOID:0000000009480830
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
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check DTC.
3. If DTC is detected, go to
.
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000009480831
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect engine coolant temperature (ECT) sensor harness
connector.
2. Turn ignition switch ON.
3. Check voltage between ECT sensor terminal 1 and ground with
CONSULT or tester.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit, short to ground or short to power in
harness or connectors.
3.
CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
BBIA0614E
BBIA0615E
Voltage: Approximately 5 V
PBIB0080E
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