Subaru IMPREZA GD 2007 Series Manual page 1841

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG if the criteria below are met.
Judgment Value
Malfunction Criteria
Engine coolant temperature
Timer for diagnosis after engine start
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 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.
Temperature
°C (°F)
0 (0)
–20 (–4) 0 ms
–10 (14) 0 ms
0 (32) 0 ms
10 (50) 0 ms
20 (68) 0 ms
Judgment value of timer after engine starting
t = 451.1 – 25.9 × Ti
Ti : The lowest coolant temperature after engine start
Time Needed for Diagnosis: To be determined. (It is varied by the Min. engine coolant temperature and en-
gine conditions such as vehicle speed and engine coolant temperature.)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are met.
Judgment Value
Malfunction Criteria
Engine coolant temperature
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONS
• When the OK driving cycle is completed three times in a row
• When "Clear Memory" is performed
Threshold Value
< 20°C (68°F)
≥ Judgment value of
timer after engine start
Vehicle speed km/h (MPH)
8 (5) 16 (10) 24 (15)
37.14 ms 74.27 ms 111.41 ms
27.39 ms 54.78 ms 82.17 ms
17.65 ms 35.29 ms 52.94 ms
7.90 ms 15.80 ms 23.70 ms
7.90 ms 15.80 ms 23.70 ms
Threshold Value
≥ 20°C (68°F)
GD(H4DOTC)-50
32 (20) 40 (25) 48 (30)
126.66 ms 141.91 ms 163.59 ms
99.65 ms 117.13 ms 135.96 ms
72.64 ms 92.34 ms 108.34 ms
45.63 ms 67.56 ms 80.71 ms
45.63 ms 67.56 ms 80.71 ms
56 (35)
185.26 ms
154.80 ms
124.33 ms
93.87 ms
93.87 ms