Nissan Frontier D22. Instruction — part 268
DTC P0125 ECT SENSOR
EC-175
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC Confirmation Procedure
UBS00D3G
CAUTION:
Be careful not to overheat engine.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Check that “COOLAN TEMP/S” is above 10
°C (50°F).
If it is above 10
°C (50°F), the test result will be OK.
If it is below 10
°C (50°F), go to the following step.
4.
Start engine and run it for 65 minutes at idle speed.
If “COOLAN TEMP/S” increases to more than 10
°C (50°F)
within 65 minutes, stop engine because the test result will
be OK.
5.
If 1st trip DTC is detected, go to
EC-177, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II”.
SEF174Y
EC-176
[KA24DE]
DTC P0125 ECT SENSOR
Wiring Diagram
UBS00D3H
AEC984A
DTC P0125 ECT SENSOR
EC-177
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Diagnostic Procedure
UBS00D3I
1.
CHECK POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect engine coolant temperature sensor harness connec-
tor.
3.
Turn ignition switch ON.
4.
Check voltage between engine coolant temperature sensor ter-
minal 1 and ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the harness for open or short between ECM and engine coolant temperature sensor.
>> Repair harness or connectors.
3.
CHECK GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check harness continuity between engine coolant temperature sensor terminal 2 and engine ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the harness for open or short between ECM and engine coolant temperature sensor.
>> Repair open circuit or short to power in harness or connectors.
SEF330V
Voltage
: Approximately 5V
SEF206W
Continuity should exist.
EC-178
[KA24DE]
DTC P0125 ECT SENSOR
5.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-178, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace engine coolant temperature sensor.
6.
CHECK THERMOSTAT OPERATION
When the engine is cooled [lower than 76.5
°C (170°F)], condition grasp lower radiator hose and confirm the
engine coolant does not flow.
OK or NG
OK
>> GO TO 7.
NG
>> Repair or replace thermostat. Refer to
7.
CHECK INTERMITTENT INCIDENT
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Component Inspection
UBS00D3J
ENGINE COOLANT TEMPERATURE SENSOR
1.
Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.
<Reference data>
*: These data are reference values and are measured between ECM terminal
59 (Engine coolant temperature sensor) and ground.
2.
If NG, replace engine coolant temperature sensor.
PBIB2005E
Engine coolant
temperature
°C (°F)
Voltage*
V
Resistance
k
Ω
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
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