Abnormality Judgment
Judge NG when the malfunction criteria below are completed.
Judgment Value
JUDGMENT VALUE
| Malfunction Criteria | Threshold Value |
|---|---|
| Engine coolant temperature | < 20°C (68°F) |
| Timer for diagnosis after engine starting | >/= Timer judgment value after engine starting |
Timer for diagnosis after engine starting
- Timer stop at fuel cut mode.
- During the driving conditions (except a) above), timer count up by 64 milliseconds + TWCNT milliseconds at every 64 milliseconds.
Where, TWCNT is determined as follows,
TWCNT = 0 at idle switch ON,
Refer to the following table for TWCNT with idle switch OFF.
IDLE SWITCH SPECIFICATION
| Temp. °C (°F) | Vehicle speed km/h (MPH) | |||||||
|---|---|---|---|---|---|---|---|---|
| 0 (0) | 8 (4.97) | 16 (9.94) | 24 (14.9) | 32 (19.9) | 40 (24.9) | 48 (29.8) | 56 (34.8) | |
| -20 (-4) | 0 ms | 37.1 ms | 72.3 ms | 111.4 ms | 126.7 ms | 141.9ms | 163.6 ms | 185.3 ms |
| -10 (14) | 0 ms | 27.4 ms | 54.8 ms | 82.2 ms | 99.7 ms | 117.1 ms | 136.0 ms | 154.8 ms |
| 0 (32) | 0 ms | 17.6 ms | 35.3 ms | 52.9 ms | 72.6 ms | 92.3 ms | 108.3 ms | 124.3 ms |
| 10 (50) | 0 ms | 7.9 ms | 15.8 ms | 23.7 ms | 45.6 ms | 67.6 ms | 80.7 ms | 93.9 ms |
| 20 (68) | 0 ms | 7.9 ms | 15.8 ms | 23.7 ms | 45.6 ms | 67.6 ms | 80.7 ms | 93.9 ms |
Judgment value of timer after engine starting
t = 429.5 - 28.605 x Ti
Ti is the lowest engine coolant temperature after starting the engine.
Time Needed for Diagnosis: To be determined. (It is varied by the Min. engine coolant temperature and engine conditions such as vehicle speed and engine coolant temperature.)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.