Subaru Legacy BN/BS (2015-2019) Service Manual: Inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (heater ventilator and a c) / Evaporator sensor / Inspection

1. Prepare the vehicle.

NOTE:

Check that the ambient temperature is 25 — 40°C (77 — 104°F) and that the humidity is 30% — 80%.

• Place the vehicle in the workshop or in the shade and windless condition.

• Open all windows.

2. Set the vehicle to the following conditions.

Item	Condition
Engine	Idling
Air vent grille	Shutter is fully open.
AC switch	OFF
Temperature adjustment dial	LO (MAX COOL)
FRESH/RECIRC switch	RECIRC
Air flow control switch	VENT
Fan switch (auto A/C model)	5/7 level
Fan dial (manual A/C model)	3/4 level

3. Using the Subaru Select Monitor, check the evaporator sensor.

NOTE:

For detailed operation procedures, refer to “Application help”.

(1) Connect the Subaru Select Monitor.

(2) On «Start» display, select «Diagnosis».

(3) On «Vehicle selection» display, enter vehicle information and select «Confirmed».

(4) On «Select System» display, select «Air Condition System» and select «Enter».

(5) On «Select Function» display, select «Data Monitor».

(6) From the data monitor item list, select «Evaporator Temperature».

(7) Idle the engine for 15 minutes, and then compare the air flow outlet temperature with «Evaporator Temperature Target».

Preparation tool:

Thermometer and hygrometer

NOTE:

For outlet opening temperature, measure the average temperature of center grille assembly and side grille assembly.

(8) Do the air flow outlet temperature and «Evaporator Temperature Target» differ by 3°C (5.4°F) or more-

• Yes > Go to step 4).

• No > Evaporator sensor is normal.

4. Check the evaporator sensor.

(1) Disconnect the connector.

(2) Measure the resistance between connector terminals.

Preparation tool:

Circuit tester

Terminal No.	Inspection conditions	Standard
1 — 2	−20°C	13.584 — 14.541 k-
	−15°C	10.34 — 10.946 k-
	−10°C	7.938 — 8.313 k-
	−5°C	6.143 — 6.366 k-
	0°C	4.79 — 4.914 k-
	5°C	3.718 — 3.829 k-
	10°C	2.889 — 3.031 k-
	15°C	2.247 — 2.435 k-
	20°C	1.785 — 1.952 k-
	25°C	1.427 — 1.574 k-
	30°C	1.149 — 1.278 k-
	35°C	0.931 — 1.044 k-
	40°C	0.759 — 0.858 k-

• Yes > Evaporator sensor is normal.

• No > Replace the evaporator sensor.

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