System Description
SYSTEM DESCRIPTION
| Sensor | Input Signal to ECM | ECM function | Actuator | ||||
|---|---|---|---|---|---|---|---|
| Camshaft position sensor (PHASE) | Engine speed(2) Piston position |
EGR volume control | EGR volume control valve | ||||
| Crankshaft position sensor (POS) | |||||||
| Mass air flow sensor | Amount of intake air | ||||||
| Engine coolant temperature sensor | Engine coolant temperature | ||||||
| Throttle position sensor | Throttle position | ||||||
| Accelerator pedal position sensor | Accelerator pedal position | ||||||
| Park/neutral position (PNP) switch | Gear position | ||||||
| Battery | Battery voltage(2) | ||||||
| Air conditioner switch | Air conditioner operation(1) | ||||||
| Power steering pressure sensor | Power steering operation | ||||||
| Electrical load | Electrical load signal(1) | ||||||
| Wheel sensor | Vehicle speed(1) | ||||||
| TCM | Gear position, shifting signal(1) | ||||||
|
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This system controls flow rate of EGR led from exhaust manifold to intake manifold. The opening of the EGR by-pass passage in the EGR volume control valve changes to control the flow rate. A built-in step motor moves the valve in steps corresponding to the ECM output pulses. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. The EGR volume control valve remains closed under the following conditions.
- Engine stopped
- Engine starting
- Engine idling
- Low engine coolant temperature
- Excessively high engine coolant temperature
- High engine speed
- Wide open throttle
- Low battery voltage