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Hino P0117 Fault Code: Engine Coolant Temperature Sensor 1 – Out Of Range (Out Of Range Low)

30/11/2024

Technical description

The engine coolant temperature sensor installed to the thermostat case consistently measures the engine coolant temperature.

Description of malfunction

The engine coolant temperature cannot be correctly recognized.

DTC set condition

DTC Detection Condition:

− Starter switch ON.

− Battery voltage is in the range of 10 V to 16 V.

The conditions described above remain for 5 seconds or longer.

Judgment Criteria:

Output of the sensor remains at 0.1 V (139°C {282.2°F}) or less for 3 seconds or longer.

Reset condition

After restoration to normal condition.

Indication, warning or system control regulation when the dtc is set

− MIL: ON

− SVS light: OFF

− Engine output is restricted.

− Cruise control function is not available.

− Idling stop system is not available.

− Vehicle start control is not available.

Symptoms on the vehicle when the dtc is set

Symptoms on the Vehicle Due to Backup Control (Fail Safe Function):

− Engine output is insufficient.

− Cruise control does not work.

− Idling stop system does not work.

− Vehicle start control does not work.

Pre-inspection work

Check that the battery voltage is in the normal range.

After-inspection work

− Clear all past DTCs.

− Check that no DTC is stored after test drive.

Possible causes

− Engine coolant temperature sensor:

− Loose/disconnected sensor or failure in sensing area (contamination, clogging or breakage).

− Abnormal resistance of the engine coolant temperature sensor.

− Failure in engine ECU sensor power supply, internal circuit failure.

− Disconnection or short-circuit in sensor harness. − Faulty connector contact or fit.

Inspection procedure

Troubleshooting steps

Step 1) Inspect the engine coolant temperature sensor connector.

Check the connection of the enginecoolant temperature sensor connector (Looseness and poor contact).

Were any failures found?

Yes – Connect securely, repair if needed. Clear all past DTCs. Check that no DTC is detected after test drive.

No – Go to Step 2.

Step 2) Inspect the engine coolant temperature sensor.

Check the installation of the engine coolant temperature sensor.
Make sure there is no dirt or damage to the engine coolant temperature sensor.

Were any failures found?

Yes – Clean the engine coolant temperature sensor and install it properly. If damaged, replace the engine coolant temperature sensor. Clear all past DTCs. Check that no DTC is detected after test drive.

No – Go to Step 3.

Step 3) Inspect the engine coolant temperature sensor unit.

Set the starter switch to the “LOCK” position.
Disconnect the engine coolant temperature sensor connector.
Use the electrical tester to measure the resistance between the terminals of the engine coolant temperature sensor.

MEASUREMENT CONDITIONS	TESTER CONNECTIONS	STANDARD VALUES
Starter switch: LOCK	Engine coolant temperature sensor WTM+ – WTM	20°C {68°F}: 2.59 – 2.32 kΩ 80°C {176°F}: 0.326 – 0.310 kΩ

Do the measurements meet the standard value?

Yes – Go to Step 4.

No – Replace the engine coolant temperature sensor. Clear all past DTCs. Check that no DTC is detected after test drive.

Step 4) Inspect the actuation power supply wire harness of the engine coolant temperature sensor.

Set the starter switch to the “ON” position.
Use the electrical tester to measure the voltage between the terminals of the engine coolant temperature sensor vehicle-side connector.

MEASUREMENT CONDITIONS	TESTER CONNECTIONS	STANDARD VALUES
Starter switch: ON	Engine coolant temperature sensor vehicle-side connector WTM+ – WTM-	4.5 – 5.5 V

Do the measurements meet the standard value?

Yes – Go to Step 7.

No – Go to Step 5.

Step 5) Inspect for short-circuit of the engine coolant temperature sensor harness.

Set the starter switch to the “LOCK” position.
Connect the signal check harness to the engine ECU. (Do not connect the harness to the ECU).
Use the electrical tester to measure the resistance between the terminals of the engine ECU (signal check harness) and ground.

MEASUREMENT CONDITIONS	TESTER CONNECTIONS	STANDARD VALUES
Starter switch: LOCK	Engine ECU (signal check harness) THW+(E66) – Ground AG5(E58) – Ground	∞ Ω

Do the measurements meet the standard value?

Yes – Go to Step 6.

No – Repair or replace the harness. Clear all past DTCs. Check that no DTC is detected after test drive.

Step 6) Inspect disconnection of the engine coolant temperature sensor harness.

Connect the engine coolant temperature sensor connector.
Use the electrical tester to measure the resistance between the terminals of the engine ECU (signal check harness).

MEASUREMENT CONDITIONS	TESTER CONNECTIONS	STANDARD VALUES
Starter switch: LOCK	Engine ECU (signal check harness) THW+(E66) – AG5(E58)	20°C {68°F}: 2.59 – 2.32 kΩ 80°C {176°F}: 0.326 – 0.310 kΩ