Nissan Cube. Manual — part 320
EC-166
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
P0117, P0118 ECT SENSOR
P0117, P0118 ECT SENSOR
Description
INFOID:0000000009947286
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>
*: These data are reference values and are measured between ECM terminal 38
(Engine coolant temperature sensor) and ground.
DTC Logic
INFOID:0000000009947287
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> 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
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009947288
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
SEF594K
Engine coolant temperature
[
°
C (
°
F)]
Voltage* (V)
Resistance (k
Ω
)
–10 (14)
4.4
7.0 - 11.4
20 (68)
3.5
2.37 - 2.63
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
Engine coolant temperature
sensor circuit low input
An 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
Engine coolant temperature
sensor circuit high input
An excessively high voltage from the sensor
is sent to ECM.
P0117, P0118 ECT SENSOR
EC-167
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
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2.
Check ground connection E38. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect engine coolant temperature (ECT) sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between ECT sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
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 and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-167, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace engine coolant temperature sensor. Refer to
5.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009947289
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. Refer to
.
4.
Check resistance between engine coolant temperature sensor terminals by heating with hot water as
shown in the figure.
ECT sensor
Ground
Voltage
Connector
Terminal
F28
1
Ground
Approx. 5 V
ECT sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F28
2
F8
44
Existed
Terminals
Condition
Resistance
1 and 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
EC-168
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
P0117, P0118 ECT SENSOR
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace engine coolant temperature sensor. Refer to
P0122, P0123 TP SENSOR
EC-169
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
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P0122, P0123 TP SENSOR
Description
INFOID:0000000009947290
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.
DTC Logic
INFOID:0000000009947291
DTC DETECTION LOGIC
NOTE:
If DTC P0122 or P0123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to
.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009947292
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection E38. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT
1.
Disconnect electric throttle control actuator harness connector.
2.
Turn ignition switch ON.
PBIB0145E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0122
Throttle position sensor
2 circuit low input
An excessively low voltage from the TP sensor
2 is sent to ECM.
• Harness or connectors
(TP sensor 2 circuit is open or shorted.)
• Electric throttle control actuator
(TP sensor 2)
P0123
Throttle position sensor
2 circuit high input
An excessively high voltage from the TP sensor
2 is sent to ECM.
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