Subaru Legacy IV (2008 year). Service manual — part 615
GD(H6DO)-80
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BH:DTC P0196 ENGINE OIL TEMPERATURE SENSOR CIRCUIT RANGE/
PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect for abnormal values in the oil temperature sensor output properties.
Judge as NG when the oil temperature does not rise even though the engine is running under a condition
where it should rise.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after starting the engine.
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Engine speed
t Value from Map
Map
Engine coolant temperature
°C (°F)
–40 (–40)
110 (230)
Engine speed
rpm
500
500
GD(H6DO)-81
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
4. DIAGNOSTIC METHOD
• Abnormality Judgement
Judge as NG when the following conditions are established.
After engine start oil temperature sensor characteristic diagnosis timer (timer for diagnosis).
a. Timer stop at fuel cut
b. During the driving conditions except a) above, timer counts up as follows.
64 milliseconds + TOILCNT milliseconds (at the time of 64 milliseconds).
Where, TOILCNT is determined as follows,
TOILCNT = 0 at idle switch ON
For TOILCNT at Idle switch off, refer to the following table.
After engine start oil temperature characteristic diagnosis timer judgment value (t).
t = 2400000 ms – 60000 ms × Ti (t
t 2400000)
Ti = The lowest coolant temperature after starting the engine.
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 if the following conditions are established.
Time Needed for Diagnosis: Less than 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Engine oil temperature
< 15 °C (59 °F)
After engine start oil temperature sensor
characteristic diagnosis timer.
t Judgement value for after
engine start oil temperature sen-
sor characteristic diagnosis timer
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)
–40 (–40)
0 ms
32 ms
76 ms
130 ms
149 ms
171 ms
176 ms
181 ms
–30 (–22)
67 ms
93 ms
121 ms
157 ms
170 ms
184 ms
193 ms
203 ms
–20 (–4)
98 ms
123 ms
148 ms
184 ms
193 ms
204 ms
214 ms
226 ms
–10 (14)
145 ms
166 ms
187 ms
208 ms
223 ms
239 ms
242 ms
245 ms
0 (32)
161 ms
187 ms
212 ms
243 ms
252 ms
262 ms
266 ms
270 ms
Judgement Value
Malfunction Criteria
Threshold Value
Engine oil temperature
t 15 °C (59 °F)
GD(H6DO)-82
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BI: DTC P0197 ENGINE OIL TEMPERATURE SENSOR LOW
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of the oil temperature sensor.
Judge as NG when outside of the judgment value.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
Secondary Parameters
Enable Conditions
None
Judgement Value
Malfunction criteria
Threshold value
Output voltage
< 0.166 V
Judgement Value
Malfunction criteria
Threshold value
Output voltage
t 0.166 V
GD(H6DO)-83
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BJ:DTC P0198 ENGINE OIL TEMPERATURE SENSOR HIGH
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of the oil temperature sensor.
Judge as NG when outside of the judgment value.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
Secondary Parameters
Enable Conditions
None
Judgement Value
Malfunction criteria
Threshold value
Output voltage
t 4.716 V
Judgement Value
Malfunction criteria
Threshold value
Output voltage
< 4.716 V
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