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 VIV(Variable Intake Manifold Valve) every 10 sec. under detecting condition, if the value within detecting condition lasts for more than 5 sec., ECM sets P0660.
Item
Detecting Condition
Possible cause
DTC Strategy
Signal low, high
Poor connection
Open or short in VIV circuit
Faulty VIV
Faulty ECM
Enable Conditions
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
DTC only (NO MIL ON)
VIV
Specification(22 ?)
Resistance(?)
30 ~ 35