Outline Of Diagnosis
WARNING: This page is about a different variant/trim than selected.
Check if there is a leakage in fuel system or not, and perform the function diagnosis of valve.
In this system diagnosis, check for leakage and valve function is conducted by changing the fuel tank pressure and monitoring the pressure change using the fuel tank pressure sensor. When in 0.04 inch diagnosis, perform in the order of mode Z → mode A → mode B → mode C and mode D; When in 0.02 inch diagnosis, perform in the order of mode A → mode B → mode C → mode D and mode E.
0.04-inch Diagnosis
MODE DESCRIPTION CHART
| Mode | Mode Description | Diagnosis Period |
|---|---|---|
| Mode Z (Purge control solenoid valve opening failure diagnosis) | Perform purge control solenoid valve opening failure diagnosis from the size of tank pressure variation from diagnosis start. | 0 ms + 3000 ms - 0 ms +3000 ms+ 13000 ms |
| Mode A (Estimated evaporation amount) | Calculate the tank pressure change amount (P1). | 10000 ms |
| Mode B (Sealed negative pressure, large leakage judgment) | Decrease the pressure in the tank to the target value by introducing the intake manifold pressure to the fuel tank. If the tank pressure cannot be reduced, it is diagnosed as large leak. |
0 - 10000 ms + 25000 ms |
| Mode C (Pressure increase check, advanced OK judgment) | Wait until the tank pressure returns to the target (start level of P2 calculation). If the tank pressure does not become the value, make advanced OK judgment. | 0 - 23635 ms |
| Mode D (Negative pressure variation measurement, evaporation leakage diagnosis) | Calculate the tank pressure variation (P2), and obtain the diagnostic value using P1 found in Mode A. Perform the evaporation diagnosis using the diagnostic value. |
0 ms + 10000 ms |
Mode Table for Evaporative Emission Control System Diagnosis
DIAGNOSTIC ITEM CHART
| Mode | Behavior of tank internal pressure under normal conditions | Diagnostic item | DTC |
|---|---|---|---|
| Mode Z | Roughly the same as barometric pressure (Same as 0 kPa (0 mmHg, 0 inHg)) | Purge control solenoid valve is judged to be open. | P0457 |
| Mode A | Pressure is in proportion to amount of evaporative emission. | - | None |
| Mode B | Negative pressure is formed due to intake manifold negative pressure | Large leak | P0457 |
| Mode C | Reaches target pressure | - | None |
| Mode D | Pressure change is small. | EVAP system large leak determination. [1.0 mm (0.04 in)] | P0442 |
0.02-inch Diagnosis
MODE DESCRIPTION CHART
| Mode | Mode Description | Diagnosis Period |
|---|---|---|
| Mode A (0 point compensation) | When the pressure in the tank is not near 0 mmHg, wait until it returns to 0 point (near 0 mmHg). | 0 - Value of Map 1 |
| Mode B (Negative pressure introduced) | Decrease the pressure in the tank to the target value by introducing the intake manifold pressure to the fuel tank. | 0 - Value of Map 2 |
| Mode C (Negative pressure maintained) | Wait until the tank pressure returns to the target (start level of P2 calculation). | Value from Map 3 |
| Mode D (Negative pressure change calculated) | Calculate the time it takes for the tank pressure to change to the Mode E shifting pressure. If the tank pressure does not change to the Mode E shifting pressure, make advanced OK judgment. | 0 - 0 ms + Value from Map 4 |
| Mode E (Evaporation generated amount calculation) | Calculate the amount of evaporation (P1). | 0 - 0 ms + Value from Map 4 + Value from Map 5 |
Map 1
FUEL LEVEL REFERENCE
| Fuel level (l , US gal, lmp gal) | 10 | 27, 7.13, 5.94 | 43, 11.36, 9.46 | 59.5, 15.72, 13.09 |
|---|---|---|---|---|
| Time Needed for Diagnosis (ms) | 9216 | 9216 | 7936 | 4736 |
Map 2
FUEL LEVEL REFERENCE
| Fuel level (l , US gal, lmp gal) | 10 | 27, 7.13, 5.94 | 43, 11.36, 9.46 | 59.5, 15.72, 13.09 |
|---|---|---|---|---|
| Time Needed for Diagnosis (ms) | 21180 | 23924 | 24931 | 24931 |
Map 3
FUEL LEVEL REFERENCE
| Fuel level (l , US gal, lmp gal) | 10 | 27, 7.13, 5.94 | 43, 11.36, 9.46 | 59.5, 15.72, 13.09 |
|---|---|---|---|---|
| Time Needed for Diagnosis (ms) | 51830 | 32722 | 18045 | 13071 |
Map 4
FUEL LEVEL REFERENCE
| Fuel level (l , US gal, lmp gal) | 10 | 20, 5.28, 4.4 | 30, 7.93, 6.6 | 40, 10.57, 8.8 | 50, 13.21, 11 | 60, 15.85, 13.2 |
|---|---|---|---|---|---|---|
| Time Needed for Diagnosis (ms) | 200000 | 200000 | 200000 | 200000 | 200000 | 200000 |
Map 5
FUEL LEVEL REFERENCE
| Fuel level (l , US gal, lmp gal) | 10 | 20, 5.28, 4.4 | 30, 7.93, 6.6 | 40, 10.57, 8.8 | 50, 13.21, 11 | 60, 15.85, 13.2 |
|---|---|---|---|---|---|---|
| Time Needed for Diagnosis (ms) | 80000 | 70000 | 60000 | 60000 | 60000 | 60000 |