Monitor Description
OUTLINE OF DIAGNOSIS
Detect the open or short circuit of the vacuum pump in canister pump module.
Judge as NG if out of specification.
COMPONENT DESCRIPTION
| *1 | Canister pump module | *2 | Switching valve |
| *3 | Reference orifice (0.02 inch orifice) | *4 | Pressure sensor |
| *5 | Vacuum pump | *6 | Drain filter |
| *7 | Purge valve | *8 | Intake manifold |
| *9 | Fuel tank assembly | *10 | Charcoal canister assembly |
EXECUTION CONDITION
| Secondary parameters | Execution condition |
|---|---|
| Ignition switch or soaking timer | ON |
| Battery voltage | 10.9 V or higher |
| Vacuum pump drive signal in the canister pump module | OFF |
GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
DIAGNOSTIC METHOD
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgment value
| Malfunction Criteria | Threshold Value |
|---|---|
| Voltage detected by vacuum pump in the canister pump module | 3 V or less |
Time needed for diagnosis
2500 ms
Malfunction indicator light illumination
Illuminates as soon as a malfunction occurs.