Subaru 2009 IMPREZA, Service Manual

Page: 764 / 3619

GD(H4SO)-40
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
Judge as NG if the criteria below are met.
Timer for diagnosis after engine start
a. Timer stop at fuel cut
b. During the driving conditions except a) above, timer counts up as follows.
64 millis TWCNT milliseconds (at the time of 64 milliseconds)
TWCNT is defined as follows
TWCNT = 0 at idle switch ON
TWCNT show on the following table at idle switch OFF.
Judgement value of timer after engine starting
t = 573669 ms – 33924 ms × 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 cy-
cles.
• Normality Judgement
Judge as OK and clear the NG when the malfunction criteria below are met.
Time Needed for Diagnosis: Less than 1 second
Judgement Value
Malfunction Criteria Threshold Value
Engine coolant temperature < 20 °C (68 °F)
Timer for diagnosis after engine start
t
Judgement value of
timer after engine start
Vehicle 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 32.076 ms 39.977 ms 47.879 ms 82.544 ms 117.209 ms 154.214 ms 185.26 ms
–10 (14) 0 ms 25.704 ms 33.606 ms 41.508 ms 68.52 ms 95.532 ms 125.667 ms 155.802 ms
0 (32) 0 ms 17.646 ms 25.548 ms 33.45 ms 53.652 ms 73.855 ms 97.12 ms 120.386 ms
10 (50) 0 ms 7.901 ms 15.802 ms 23.704 ms 37.941 ms 52.177 ms 68.573 ms 82.538 ms
20 (68) 0 ms 7.901 ms 15.802 ms 23.704 ms 37.941 ms 52.177 ms 68.573 ms 82.538 ms
Judgement Value
Malfunction Criteria Threshold Value
Engine coolant temperature
t
20 °C (68 °F)