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