Nissan Cube. Manual — part 321
EC-170
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
P0122, P0123 TP SENSOR
3.
Check the voltage between electric throttle control actuator 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 THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.
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 THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.
2.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK THROTTLE POSITION SENSOR
EC-171, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1.
Replace electric throttle control actuator.
2.
EC-171, "Special Repair Requirement"
>> INSPECTION END
7.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
Electric throttle control actuator
Ground
Voltage
Connector
Terminal
F29
2
Ground
Approx. 5 V
Electric throttle control actuator
ECM
Continuity
Connector
Terminal
Connector
Terminal
F29
4
F8
36
Existed
Electric throttle control actuator
ECM
Continuity
Connector
Terminal
Connector
Terminal
F29
3
F8
34
Existed
P0122, P0123 TP SENSOR
EC-171
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Component Inspection
INFOID:0000000009947293
1.
CHECK THROTTLE POSITION SENSOR
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
EC-19, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
.
4.
Turn ignition switch ON.
5.
Set selector lever to D (CVT) or 1st (M/T) position.
6.
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1.
Replace electric throttle control actuator.
2.
EC-171, "Special Repair Requirement"
>> INSPECTION END
Special Repair Requirement
INFOID:0000000009947294
1.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
EC-19, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
>> GO TO 2.
2.
PERFORM IDLE AIR VOLUME LEARNING
EC-20, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
>> END
ECM
Ground
Condition
Voltage
Connector
Terminal
F8
33
(TP sensor
1 signal)
Ground
Accelerator
pedal
Fully released
More than
0.36V
Fully de-
pressed
Less than
4.75V
34
(TP sensor
2 signal)
Fully released
Less than
4.75V
Fully de-
pressed
More than
0.36V
EC-172
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
P0125 ECT SENSOR
P0125 ECT SENSOR
Description
INFOID:0000000009947295
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:0000000009947296
DTC DETECTION LOGIC
NOTE:
• If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to
.
• If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. 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.
>> GO TO 2.
2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION
With CONSULT
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT.
3.
Check that “COOLAN TEMP/S” is above 10
°
C (50
°
F).
With GST
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
P0125
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
P0125 ECT SENSOR
EC-173
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
C
D
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EC
N
P
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Follow the procedure “With CONSULT” above.
Is it above 5
°
C (41
°
F)?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Start engine and run it for 65 minutes at idle speed.
2.
Check 1st tip DTC.
If “COOLAN TEMP/S” indication increases to more than 10
°
C (50
°
F) within 65 minutes, stop engine
because the test result will be OK.
CAUTION:
Be careful not to overheat engine.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES
>>
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009947297
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 ENGINE COOLANT TEMPERATURE SENSOR
EC-173, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace engine coolant temperature sensor. Refer to
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.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace thermostat. Refer to
CO-21, "Removal and Installation"
4.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009947298
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.
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