Subaru LEGACY 2006 Manual page 525

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AO:DTC P0196 ENGINE OIL TEMPERATURE SENSOR CIRCUIT RANGE/PER-
FORMANCE
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
Secondary Parameters
Battery voltage
Engine speed
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after starting the engine.
4. DIAGNOSTIC METHOD
Abnormality Judgment
When the following conditions are established, judged as NG.
Judgment Value
Malfunction Criteria
Engine oil temperature
After engine start oil temperature sensor
characteristic diagnosis timer.
After engine start oil temperature sensor characteristic diagnosis timer (timer for diagnosis).
a. Timer stop at fuel cut mode.
b. During the driving conditions except a) above, timer count up by
64 milliseconds + TCILCNT milliseconds at every 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.
0 (0)
–30
64 ms
(–22)
Temper-
–20 (–4) 64 ms
ature
–10 (14) 64 ms
°C (°F)
0 (32) 64 ms
10(50) 102.2 ms
After engine start oil temperature characteristic diagnosis timer judgment value (t).
t = 1882940 – 43302 × Ti (t ≥ 1882940)
Ti = The lowest coolant temperature after starting the engine.
Time Needed for Diagnosis: Undecided
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Enable Conditions
≥ 10.9 V
≥ 500 rpm
Threshold Value
< 15°C (59°F)
≥Judgment value for after engine
start oil temperature sensor char-
acteristic diagnosis timer
Vehicle speed km/h (MPH)
8 (5) 16 (10) 24 (15)
73.2 ms 83.9 ms 96.3 ms
73.3 ms 84 ms 96.6 ms
73.4 ms 84.2 ms 96.9 ms
73.5 ms 84.5 ms 97.4 ms
114.8 ms 129.4 ms 146.7 ms
GD(H4SO)-88
32 (20) 40 (25) 48 (30)
113.2 ms 133.9 ms 160.2 ms
113.7 ms 135 ms 162 ms
114.5 ms 136.4 ms 164.4 ms
115.6 ms 138.5 ms 168 ms
171.7 ms 203.4 ms 245.1 ms
56 (35)
194.6 ms
197.4 ms
201.5 ms
207.6 ms
302.1 ms