Nissan Sentra. Manual — part 375
EC-196
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0116 ECT SENSOR
P0116 ECT SENSOR
DTC Logic
INFOID:0000000009758456
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
INSPECTION START
Is it necessary to erase permanent DTC?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-197, "Component Function Check"
NOTE:
Use the component function check to check the overall function of the ECT sensor circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
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. 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).
2. Turn ignition switch OFF and leave the vehicle for 12 hours.
CAUTION:
Never turn ignition switch ON during this procedure.
NOTE:
The vehicle must be cooled with the food open.
3. Start engine and let it idle for 5 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling.
4. Check 1st trip DTC.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0116
ECT SEN/CIRC
(Engine coolant temperature
sensor 1 circuit range/perfor-
mance)
The comparison result of signals transmitted
to ECM from each temperature sensor (IAT
sensor, ECT sensor, FTT sensor, and EOT
sensor) shows that the voltage signal of the
ECT sensor is higher/lower than that of other
temperature sensors when the engine is
started with its cold state.
• Harness or connectors
(High or low resistance in the ECT
sensor circuit)
• ECT sensor
P0116 ECT SENSOR
EC-197
< DTC/CIRCUIT DIAGNOSIS >
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Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Component Function Check
INFOID:0000000009758457
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect ECT sensor harness connector.
3. Remove ECT sensor. Refer to
.
4. Check resistance between ECT sensor terminals by heating
with hot water as shown in the figure.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000009758458
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
Check ECT sensor. Refer to
EC-197, "Component Inspection"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace ECT sensor. Refer to
Component Inspection
INFOID:0000000009758459
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect ECT sensor harness connector.
3. Remove ECT sensor.
4. Check resistance between ECT sensor terminals by heating
with hot water as shown in the figure.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace engine coolant temperature sensor. Refer to
ECT sensor
Condition
Resistance (k
Ω)
+
−
Terminal
1
2
Temperature [
°C
(
°F)]
20 (68)
2.37 – 2.63
50 (122)
0.68 – 1.00
90 (194)
0.236 – 0.260
JMBIA0080ZZ
ECT sensor
Condition
Resistance
(k
Ω)
+
−
Terminal
1
2
Temperature [
°C (°F)]
20 (68)
2.37 - 2.63
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
JMBIA0080ZZ
EC-198
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0117, P0118 ECT SENSOR
P0117, P0118 ECT SENSOR
DTC Logic
INFOID:0000000009758460
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758461
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature (ECT) sensor harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ECT sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ECT sensor harness connector and ECM harness connector.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0117
ECT SEN/CIRC
(Engine coolant tempera-
ture sensor 1 circuit low)
An excessively low voltage from the engine
coolant temperature sensor is sent to ECM.
• Harness or connectors
(Engine coolant temperature sensor cir-
cuit is open or shorted.)
• Engine coolant temperature sensor
P0118
ECT SEN/CIRC
(Engine coolant tempera-
ture sensor 1 circuit high)
An excessively high voltage from the engine
coolant temperature sensor is sent to ECM.
+
−
Voltage
(Approx.)
ECT sensor
Connector
Terminal
F6
1
Ground
5.0 V
P0117, P0118 ECT SENSOR
EC-199
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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4. Also check harness for short to ground.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
3.
CHECK ENGINE COOLANT TEMPERATURE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ECT sensor harness connector and ECM harness connector.
4. Also check harness for short to ground to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check the engine coolant temperature sensor. Refer to
EC-199, "Component Inspection (ECT Sensor)"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace engine coolant temperature sensor. Refer to
Component Inspection (ECT Sensor)
INFOID:0000000009758462
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature sensor harness connector.
3. Remove engine coolant temperature sensor.
4. Check resistance between engine coolant temperature sensor
terminals by heating with hot water as shown in the figure.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace engine coolant temperature sensor. Refer to
+
−
Continuity
ECT sensor
ECM
Connector
Terminal
Connector
Terminal
F6
1
F24
28
Existed
+
−
Continuity
ECT sensor
ECM
Connector
Terminal
Connector
Terminal
F6
2
F24
27
Existed
ECT sensor
Condition
Resistance
+
−
Terminal
1
2
Temperature [
°C (°F)]
20 (68)
2.37 - 2.63 k
Ω
50 (122)
0.68 - 1.00 k
Ω
90 (194)
0.236 - 0.260 k
Ω
JMBIA0080ZZ
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