COMPONENT DESCRIPTION
ELCM consists of the pressure sensor, the reference orifice (diameter of 0.02 inch), the vacuum pump which introduces the negative pressure into evaporative emission system, and the switching valve which switches the passage to introduce the negative pressure.
Scheme 1
Mode A (Vacuum pump operation confirmation and characteristics stability)
Purpose: Detect the vacuum pump operation trouble.
Judge as NG when the following conditions are established.
Judge as OK if the following conditions are not established, and warm up for five minutes to stabilize the vacuum pump characteristics.
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| Pressure sensor output value | > -0.2 kPa (-1.68 mmHg, -0.1 inHg) | P2404 |
JUDGMENT VALUE
Mode C (Switching valve operation confirmation)
Purpose: Measure the pressure increase when switching valve is changed from open to close, and detect the stuck to open/close malfunctions of the switching valve.
Judge as NG when the following conditions are established.
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| Pressure sensor output value - Reference pressure for setting the target negative pressure | < 0.2 kPa (1.68 mmHg, 0.1 inHg) | P2404 |
JUDGMENT VALUE
Vehicle speed signals are taken in to the VDC control module and hydraulic control unit, and normal/erroneous data of the ABS wheel speed sensor is received by CAN communication from the VDC control module and hydraulic control unit.
The soaking timer IC is built into the ECM.
(Common Specifications)
CAN Protocol 2.0 B (Active)
Frame Format: 11 Bit ID Frame (Standard Frame)
Conforms to ISO11898
Communication Speed: 500 kbps
(Common Specifications)
CAN Protocol 2.0 B (Active)
Frame Format: 11 Bit ID Frame (Standard Frame)
Conforms to ISO11898
Communication Speed: 500 kbps
(Common Specifications)
CAN Protocol 2.0 B (Active)
Frame Format: 11 Bit ID Frame (Standard Frame)
Conforms to ISO11898
Communication Speed: 500 kbps