General Information

Engine Control
P0197 Engine Oil Temperature Sensor Low Input - General Information

Component Location





General Description

The Continuously Variable Valve Timing (CVVT) system uses engine oil pressure to change the camshaft timing according to engine operating conditions. Engine oil viscosity changes according to engine temperature. The Oil Temperature Sensor (OTS) signal along with coolant and intake air temperature is used by the PCM to compensate for changes in oil viscosity when commanding the Oil Control Valve (OCV). The OTS measures the engine oil temperature before the engine oil flows through the OCV.

DTC Description

The PCM monitors the output signals from Oil Temperature Sensor every 15 seconds. If the signal is low for more than 12.5 seconds, the PCM sets a P0197 DTC.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data












Fig.1) Normal waveform of EOTS at 76°C (168.4°F)
Fig.2) Normal data of IATS & ECTS & EOTS at IG "ON"
Fig.3) Normal data of IATS & ECTS & EOTS engine at operating temperature.