Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0196 engine oil temperature sensor "a" range/performance

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0196 engine oil temperature sensor "a" range/performance

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

• Hard to start

• Improper idling

• Poor driving performance

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

STEP	CHECK	YES	NO
1.CHECK FOR ANY OTHER DTC ON DISPLAY.	Is any other DTC displayed-	Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)	Replace the engine oil temperature sensor. Engine Oil Temperature Sensor

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of the engine oil temperature sensor output properties. Using the following two diagnoses, judge as NG when either is NG.

• Diagnosis 1 (correlation diagnosis): After the engine starts after the specified period of soaking time has elapsed, diagnose by correlation between engine oil temperature sensor value, engine coolant temperature sensor value and intake air temperature sensor value. Judge as NG when the differences are both above the specified value by comparing between engine oil temperature and engine coolant temperature, engine oil temperature and intake air temperature.

• Diagnosis 2 (function diagnosis): Judge as NG when engine oil temperature does not rise to the specified value regardless of an engine running condition that clears certain conditions.

2. COMPONENT DESCRIPTION

(A)	Resistance value (k-)	(B)	Temperature °C (°F)

(1)	Connector	(2)	Thermistor element

3. EXECUTION CONDITION

Diagnosis 1

Secondary Parameters	Execution condition
Soaking time	≥ 21600 s
Block heater judgment	Completed
Block heater operation	Not in operation

Diagnosis 2

Secondary Parameters	Execution condition
Engine oil temperature at engine starting	< 40 °C (104 °F)
Engine speed	> 500 rpm
Percentage of idling	≤ 0.5 - 100

4. GENERAL DRIVING CYCLE

• Diagnosis 1: Perform the diagnosis only once after the engine starts after a certain period of soaking time.

• Diagnosis 2: Perform the diagnosis only once after starting the engine from cold condition.

5. DIAGNOSTIC METHOD

Judge as NG when Diagnosis 1 or Diagnosis 2 becomes NG.

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Diagnosis 1

Judgment Value

Malfunction Criteria	Threshold Value
\|Engine oil temperature at engine start − Engine coolant temperature at engine start\|	> 10 °C (18°F)
\|Engine oil temperature at engine start − Intake air temperature 30 sec. after engine start\|	> Value of Map 1

Map 1

Ambient temperature

°C (°F)

−30

(−22)

(86)

(113)

(140)

|Engine oil temperature at engine start − Intake air temperature 30 sec. after engine start|

°C (°F)

(18°F)

(39.6°F)

Time Needed for Diagnosis: Less than 1 second

Diagnosis 2

Judgment Value

Malfunction Criteria	Threshold Value
Engine oil temperature	< 40 °C (104 °F)
Elapsed time after starting the engine	≥ Value from Map 2

Map 2

		Intake air temperature at engine start °C (°F)
		−30 (−22)	−20 (−4)	−10 (14)	0 (32)	10 (50)	20 (68)	30 (86)	40 (104)
Percentage of time when engine is at stop against time elapsed since engine start	0.0	1800000	1500000	1200000	850000	600000	450000	350000	300000
	0.3	1800000	1500000	1200000	850000	600000	450000	350000	300000
	0.6	1800000	1500000	1200000	850000	600000	450000	350000	300000
	1.0	1800000	1500000	1200000	850000	600000	450000	350000	300000
ms

Time Needed for Diagnosis: Value of Map 2

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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