System Description
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
| Unit/Sensor | Input signal to ECM | ECM function |
|---|---|---|
| EVAP control system pressure sensor | Pressure in purge line | Fuel filler cap warning control |
| Combination meter | Fuel level sensor signal * | |
| Fuel filler cap warning reset signal * |
* : This signal is sent to the ECM via the CAN communication line.
| Unit | Output signal | Actuator |
|---|---|---|
| ECM | Fuel filler cap warning display signal * | Combination meter |
* : This signal is sent to the combination meter via the CAN communication line.
SYSTEM DESCRIPTION
The fuel filler cap warning system alerts the driver to the prevention of the fuel filler being left uncapped and malfunction occurrences after refueling, by turning ON the fuel filler cap warning display on the combination meter.
ECM judges a refueled state, based on a fuel level signal transmitted from the combination meter.
When a very small leak is detected through the EVAP leak diagnosis performed after judging the refueled state, ECM transmits a fuel filler cap warning display signal (request for display ON) to the combination meter via CAN communication.
When receiving the signal, the combination meter turns ON the fuel filler cap warning display.
Check fuel filler cap installation condition when the fuel filler cap warning display turns ON.
Reset Operation
The fuel filler cap warning lamp tunes OFF, according to any condition listed below:
- Reset operation is performed by operating the meter control switch (trip computer switch) on the combination meter.
- When the reset operation is performed, the combination meter transmits a fuel filler cap warning reset signal to ECM via CAN communication. ECM transmits a fuel filler cap warning display signal (request for display OFF) to the combination meter via CAN communication. When receiving the signal, the combination meter turns OFF the fuel filler cap warning display.
- EVAP leak diagnosis result is normal.
- Fuel refilled.
- DTC erased by using CONSULT.