K11 Service ManualK11

Torque Specs Tools Parts Diagrams

DTC P0125 ENGINE COOLANT TEMPERATURE (ECT) SENSOR; Diagnostic Procedure; Steps 1-3

EF & EC-7098prose procedure

Step 1 has source typo "hairness" for "harness" preserved. Step 2 says "ECH harness connector 71" which is likely "ECM harness connector terminal 71" — preserved verbatim.

Continued from EF & EC-7097

CG10, CGA3

Diagnostic Procedure

Step 1 — CHECK POWER SUPPLY

1
Turn ignition switch "OFF".
2
Disconnect engine coolant temperature sensor harness connector. (See NEF151A)
3
Turn ignition switch "ON".
4
Check voltage between terminal 2 and ground with CONSULT-II or tester. (See SEF997W)
5
Voltage: Approximately 5 V.
6
OK or NG: - OK → GO TO 2. - NG → Repair hairness or connectors.

Step 2 — CHECK GROUND CIRCUIT

1
Turn ignition switch "OFF".
2
Check harness continuity between ECTS terminal 1 and ECH harness connector 71 or body ground. Refer to wiring diagram. Continuity should exist.
3
Also check harness for short to ground and short to power.
4
OK or NG: - OK → GO TO 4. - NG → GO TO 3.

Step 3 — DETECT MALFUNCTIONING PART

1
Check the following. - Harness for open or short between ECM and engine coolant temperature sensor.

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