P0115: Malfunction Of Coolant Temperature/Intake Air Temper. Sensor; Dtc: P0115 - Hino Motors HINO 155 series Workshop Manual

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P0115: Malfunction of coolant temperature sensor and intake air temperature sensor

Technical description

• Two engine coolant temperature sensors are installed in thermostat case and constantly measure the engine cool-

ant temperature.

• Although some exhaust gas components operate after the engine coolant temperature has risen to some degree

(engine warm up), when an engine coolant temperature sensor reads a value lower than the actual temperature, it

means it is not working properly. Diagnosis is therefore required to detect if there is something wrong with the char-

acteristics of the engine coolant temperature sensor.

• Failure of both engine coolant temperature sensors is detected.

DTC set condition

DTC detection condition

• Engine speed is at least 500 r/min or engine is stopped.

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

Judgement criteria

• When it is deemed that both engine coolant temperature sensors are malfunctioning.

Reset condition

• Problem does not recur in the same driving cycle.

• Normal operation is restored after set the starter key to the "LOCK" position when in subsequent driving cycles,

readings are in the normal range within the above detection conditions.

• Three driving cycles must be deemed normal for MIL to be OFF.

Indication, warning or system control regulation when the DTC is set.

• SVS light: OFF

ENGINE (J05E)/TROUBLESHOOTING

Coolant temperature

Coolant temperature

EN01H02127030602016044

SHTS021270300214

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Troubleshooting