Diagnostic Method
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 1 (POWER SUPPLY SHORT)
| Malfunction Criteria | Threshold Value |
|---|---|
| Fuel injector supply voltage - Fuel injector terminal voltage (+) | 2 V or less |
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 2 (GROUND SHORT)
| Malfunction Criteria | Threshold Value |
|---|---|
| Fuel injector terminal voltage (-) - Ground | 2 V or less |
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 3 (OPEN CIRCUIT)
| Malfunction Criteria | Threshold Value |
|---|---|
| Condition 1 and condition 2 are continuously detected Condition 1: Fuel injector supply voltage - Fuel injector terminal voltage (+) |
2 V or less |
| Condition 2: Fuel injector terminal voltage (-) - Ground |
2 V or less |
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 4 (SHORT CIRCUIT, OVERCURRENT)
| Malfunction Criteria | Threshold Value |
|---|---|
| Fuel injector current 3.5 μs after the injection command | 3 A or more |
Time needed for diagnosis:
Diagnosis 1: 50 times
Diagnosis 2: 50 times
Diagnosis 3: 50 times
Diagnosis 4: 25 times
Map
| Engine speed (rpm) | Time needed for 50 times of diagnosis (sec) | Time needed for 25 times of diagnosis (sec) |
|---|---|---|
| 500 | 3 | 1.5 |
| 2000 | 0.75 | 0.375 |
| 4000 | 0.375 | 0.1875 |
| 6000 | 0.25 | 0.125 |
Malfunction indicator light illumination: Illuminates as soon as a malfunction occurs.