The fluid of the CVVT is the engine oil and its density changes according to the engine oil temperature. At this time the Oil Temperature Sensor (OTS) helps compensation against the temperature differences. The Oil Temperature Sensor measures the engine oil temperature before the engine oil comes into the Oil-flow Control Valve (OCV).According to the measured temperature, the Engine Control Module (PCM) compensates the oil-flow control valve operation time.
PCM sets DTC P0198 if the PCM detects signal voltage higher than the possible range of a properly operating OTS.
ITEM | DETECTING CONDITION | POSSIBLE CAUSE |
DTC Strategy | ● Voltage range check | ● Open or short circuit to battery ● Contact resistance in connectors ● Faulty OTS |
Enable Condition | ● 5 minutes after engine start if coolant temperature ＜-10°C(14°F) | |
Threshold Value | ● Oil temperature ＜ -36°C(-33°F) | |
Diagnostic Time | ● 5 seconds |
Temp.(°C) | Temp.(°F) | Resistance(kΩ) | Temp.(°C) | Temp.(°F) | Resistance(kΩ) |
-20 | -4 | 16.52 | 40 | 104 | 1.11 |
0 | 32 | 6.00 | 60 | 140 | 0.54 |
20 | 68 | 2.45 | 80 | 176 | 0.29 |
