VIS(Variable intake system) is a device which varies the length of intake manifold to genetate maximum power at certain RPM. VIS lengthens intake manifold to improve the torque at low RPM when vehicle speed is low while it shortens intake manifold to raise torque at high RPM when vehicle speed is high. PCU controlls VIS using RPM signal.
Checking the output voltage from VIS #2 every 10 sec. under detecting condition, if the value within detecting condition lasts for more than 5 sec., PCM sets P0660. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Signal low, high | ● Poor connection ● Open or short in VIS #2 circuit ● Faulty VIS #2 ● Faulty PCM |
Enable Condition | ● After 0.5 sec under conditions below ● Engine works ● 11V ≤ Battery voltage ≤ 16V | |
Threshold value | ● Open or short | |
Diagnosis Time | ● Continuous (More than 5 seconds failure for every 10 seconds test) | |
MIL ON Condition | ● 2 driving cycles |
Item | Specification |
Coil Resistance (Ω) | 29 ~ 35 Ω at 22℃ (71.6℉) |
