The CVVT (Continuously Variable Valve Timing) system built on the camshaft helps the engine decrease the exhaust gas and increase engine power and fuel economy by changing the valve open/close timing of the intake camshaft continuously. The intake valve control solenoid, the main control part of the CVVT, changes the direction of the oil path through the CVVT by the duty control of the ECM and changes the open and close timing of the intake and exhaust valves.
ECM sets DTC P0077 if the ECM detects that the OCV control circuit is open or short to battery
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Electrical check | ● Open or short to battery in control circuit ● Contact resistance in connectors ● Faulty Intake Valve Control Solenoid |
Enable Conditions | ● 10 < Battery voltage < 16 | |
Threshold Value | ● Short to battery or Line break | |
Diagnostic Time | ● 2 seconds | |
MIL On Condition | ● 2 Driving Cycles |
Oil Control Valve | Normal Parameter At 20°C (68°F) |
Insulation Resistance | Above 50MΩ |
Temp.(°C) | Temp.(°F) | Resistance (Ω) | Temp.(°C) | Temp.(°F) | Resistance (Ω) |
0 | 32 | 6.2 ~ 7.4 | 60 | 140 | 8.0 ~ 9.2 |
10 | 50 | 6.5 ~ 7.7 | 70 | 158 | 8.3 ~ 9.5 |
20 | 68 | 6.9 ~ 7.9 | 80 | 176 | 8.6 ~ 9.8 |
30 | 86 | 7.1 ~ 8.3 | 90 | 194 | 8.9 ~ 10.1 |
40 | 104 | 7.4 ~ 8.6 | 100 | 212 | 9.2 ~ 10.4 |
50 | 122 | 7.7 ~ 8.9 |
