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. ECU controlls VIS using RPM signal.
If there is Open in VIS circuit, ECM sets DTC P0645.
Item
Detecting Condition
Possible Cause
DTC Strategy
Power stage diagnosis
Poor connection
Open or short in VIS circuit
Faulty VIS
Faulty ECM
Enable Conditions
-
Threshold Value
Open
Diagnostic Time
MIL ON Condition
No MIL
VIS
Specification(22 ?)
Resistance(?)
30 ~ 35