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

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

1. Set the vehicle to the following conditions.

Item	Condition
Ignition switch	ON
AC switch	ON
Temperature adjustment dial	HI (MAX HOT)
Air flow control switch	DEF
Fan switch	HI (MAX)

2. Check the suction port (a) for in-vehicle sensor of the cover assembly - instrument panel LWR driver.

(1) Put a strip of paper close to the front side of the suction port (a).

(2) Can you see the paper moving towards the port and the air being sucked into the port-

CAUTION:

Be careful not to let the paper get sucked into the port.

• Yes > Go to step 5).

• No > Go to step 3).

3. Remove the cover assembly - instrument panel LWR driver, and check the aspirator hose (a).

(1) Are the aspirator hoses on both sides of the case and sensor connected securely-

(2) Is the aspirator hose free from any kinks or cracks-

• Yes > Go to step 4).

• No > Repair or replace the aspirator hose if necessary.

4. Check if there is anything that affects sensing, around the in-vehicle sensor.

(1) Is the in-vehicle sensor hole free from clogging-

(2) Is the peripheral area of in-vehicle sensor free from any heat-producing parts (such as audio, navigation system etc.)-

• Yes > Go to step 5).

• No > Remove everything that affects sensing.

5. Check in-vehicle sensor.

(1) Disconnect the connector.

(2) Measure the resistance between connector terminals.

Preparation tool:

Circuit tester

CAUTION:

During inspection, be careful not to touch the sensor end in order to avoid misjudgment due to body temperature.

Terminal No.	Inspection conditions	Standard
1 — 2	10°C	3.12 — 3.7 k-
	15°C	2.49 — 2.88 k-
	20°C	2 — 2.26 k-
	25°C	1.62 — 1.79 k-
	30°C	1.32 — 1.42 k-
	35°C	1.08 — 1.14 k-
	40°C	0.89 — 0.92 k-
	45°C	0.74 — 0.75 k-
	50°C	0.62 — 0.62 k-
	55°C	0.52 — 0.51 k-
	60°C	0.44 — 0.42 k-

• Yes > The in-vehicle sensor is normal.

• No > Replace the in-vehicle sensor.

Removal

1. Disconnect the ground terminal from battery sensor. NOTE2. Remove the cover assembly - instrument panel LWR driver. Instrument Panel Lower Cover > REMOVAL3. Release the claws and remove the in-ve ...

Installation

1. Install the in-vehicle sensor.2. Install the cover assembly - instrument panel LWR driver.3. Connect the ground terminal to battery sensor. NOTE ...

Other materials:

Inspection
1. Check that the rear oxygen sensor has no deformation, cracks or other damages.2. Measure the resistance between rear oxygen sensor terminals.Terminal No.Standard1 and 25.6+0.8 −0.6 - (when 20°C (68°F)) ...