Diagnostic Method
- Abnormality Judgment
Judge as NG if the criteria below are met.
Judgment Value
ENGINE COOLANT TEMPERATUREMalfunction Criteria Threshold Value Engine coolant temperature < 20°C (68°F) Timer for diagnosis after engine start ≥ Judgment value of timer after engine start Timer for diagnosis after engine start
- Timer stop at fuel cut
- During the driving conditions except a) above, timer counts up as follows.
64 milliseconds + TWCNT milliseconds (the time of at 64 milliseconds)
TWCNT is defined as follows,
TWCNT = 0 at idle switch ON,
TWCNT show on the following table at idle switch OFF.
VEHICLE SPEED SPECIFICATIONSVehicle speed km/h (MPH) 0(0) 8(5) 16(9.9) 24(14.9) 32(19.9) 40 (24.9) 48 (29.8) 56 (34.8) Temperature °C (°F) -20 (-4) 0 ms 37.136 ms 74.272 ms 111.41 ms 126.66 ms 141.91 ms 163.59 ms 185.26 ms -10 (14) 0 ms 27.391 ms 54.782 ms 82.173 ms 99.65 ms 117.13 ms 135.96 ms 154.8 ms 0 (32) 0 ms 17.646 ms 35.292 ms 52.938 ms 72.64 ms 92.341 ms 108.34 ms 124.33 ms 10 (50) 0 ms 7.9012 ms 15.802 ms 23.704 ms 45 ms 45 ms 50 ms 50 ms 20 (68) 0 ms 7.9012 ms 15.802 ms 23.704 ms 45 ms 45 ms 50 ms 50 ms Judgment value of timer after engine starting
t = 429523 ms - 28605 ms x Ti
Ti: The lowest coolant temperature after engine start
Time Needed for Diagnosis: Less than 1 second
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are met.
Judgment Value
MALFUNCTION CRITERIA AND THRESHOLD VALUE REFERENCEMalfunction Criteria Threshold Value Engine coolant temperature ≥ 20°C (68°F) Time Needed for Diagnosis: Less than 1 second