VSS System Malfunction

VSS System Malfunction







VSV (VARIABLE SWIRL SYSTEM)
The Variable Swirl System (VSS) is designed to adjust the intensity of swirl by allowing or not allowing air to flow through a sub-port (or bypass) the runs in parallel with the intake port for each cylinder The swirl intensifies when the is no air flow through the sub- port, and vice versa.
The air flow is controlled by the on-off valve at the inlet to the sub-port and the valve in turn is turned on and off by computer signals which are dependent on engine speed, load and coolant temperature, Basically, the air is cut off at low speeds to maintain high swirl and is allowed to flow at high speeds to maintain low swirl.

VARIABLE SWIRL SYSTEM







INSPECTION

1. Thermosensor (ECT)
Soak the temperature sensitive part of a thermosensor in the water, and while changing the water temperature, make sure the resistance is changed as the following graph shows:







2. VSV
1. Resistance Check
Check the resistance between the VSV connector terminals using a circuit tester.
Cold Resistance: 37 - 44 (Ohms)







Connect battery voltage between VSV connector terminal and make sure of the continuity between the ports.







2. Airtight Check
Apply negative pressure to the negative pressure input port as illustrated on the left. Although there is leakage, it is no problem if the negative pressure rises to -350 mmHg (-47 kpa) or more.







3. Working Check
Apply powervoltage between the terminals, there is no problem if the negative pressure does not rise when applied to the input port.

CAUTION: When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.