Subaru LEGACY 2006 Manual page 488

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Diagnostic Trouble Code (DTC) Detecting Criteria
5. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG when the malfunction criteria below are met.
Judgment Value
Malfunction Criteria
Engine coolant temperature
Timer for diagnosis after engine starting
Timer for diagnosis after engine starting
a. Timer stop at fuel cut mode.
b. During the driving conditions except a) above, timer count up by
64 milliseconds + TWCNT milliseconds at every 64 milliseconds.
TWCNT is defined as follows,
TWCNT = 0 at idle switch ON,
TWCNT show on the following table at idle switch OFF.
–20 (–4)
Tempera-
–10 (14)
ture °C
(°F)
0 (32)
10 (50)
Judgment value of timer after engine starting
t = 574 – 33 × Ti (seconds)
Ti is the lowest coolant temperature after starting the engine.
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 2 continuous driving cy-
cles.
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 CONDITION
• When the OK driving cycle is completed 3 times in a row
• When "Clear Memory" is performed
Threshold Value
< 20°C (68°F)
≥Judgment value of
timer after engine
starting
0 (0) 8 (4.97) 16 (9.94)
0 ms 32.076 ms 39.977 ms
0 ms 25.704 ms 33.606 ms
0 ms 17.646 ms 25.548 ms
0 ms 7.901 ms 15.802 ms
Threshold Value
≥ 20°C (68°F)
GD(H4SO)-51
Vehicle speed km/h (MPH)
24 (14.9) 32 (19.9) 40 (24.9)
117.209
47.879 ms 82.544 ms
ms
41.508 ms 68.520 ms 95.532 ms
33.450 ms 53.652 ms 73.855 ms
23.704 ms 37.941 ms 52.177 ms
GENERAL DESCRIPTION
48 (29.8) 56 (34.8)
154.214 185.260
ms ms
125.667 155.802
ms ms
120.386
97.120 ms
ms
68.573 ms 82.538 ms