Nissan Frontier D22. Manual — part 268

DTC P0125 ECT SENSOR

EC-175

[KA24DE]

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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]

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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

Refer to

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

CO-13, "THERMOSTAT"

.

7.

CHECK INTERMITTENT INCIDENT

Perform

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