System Description: Operation
When the ignition switch is OFF, the valve is fully closed to accelerate bleeding the coolant channels.
When receiving a blower fan ON signal and/or an A/C ON signal, ECM opens the flow path to the heater & EGR cooler even when coolant temperature is low.
| Valve position | |||
|---|---|---|---|
| Heater & EGR cooler | Oil cooler | Radiator | |
| A | Full close | Full close | Full close |
| B | Open | Full close | Full close |
| C | Full open | Open | Full close |
| D | Full open | Full open | Open |
| E | Full open | Full open | Full open |
A: Closes all flow paths
,
, and
and circulates coolant only inside the engine.
B: Opens the flow path to Heater & EGR cooler and circulates coolant to Heater & EGR cooler.
C: Opens the flow path to oil cooler and circulates coolant to Heater & EGR cooler and oil cooler.
D: Opens the flow path to radiator and circulates coolant to Heater & EGR cooler, oil cooler, and radiator.
E: Opens all the flow paths
,
, and
.
The high coolant temperature control is performed by opening/closing the flow path to the radiator to raise the engine oil temperature even when the coolant temperature is high. When engine load is high, the high coolant temperature control is not performed because of the knocking control.
When detecting a malfunction in multi-way control valve, ECM fully opens the valve to secure cooling paths.