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

Subaru Legacy BN/BS (2015-2019) Service Manual / Emission control (aux. Emission control devices)(h4do) / Leak check valve assembly / Inspection

1. CHECK SWITCHING VALVE

1. Check the resistance between switching valve terminals.

Terminal No.	Standard
1 and 5	27+3 −2 - (when 20°C (68°F))
1 and 5	31±4 - (60°C (140°F))

2. Check that air is discharged from (B) when air is blown into (A).

3. Connect the battery positive terminal to the terminal No. 5 and the battery negative terminal to the terminal No. 1. Check that air does not come out from (B) when air is blown into (A).

2. CHECK VACUUM PUMP

1. Connect the battery positive terminal to terminal No. 3 and the battery ground terminal to terminal No. 4, and inspect the vacuum pump operation.

CAUTION:

Do not operate the vacuum pump for 5 minutes or more.

3. CHECK PRESSURE SENSOR

1. Connect dry-cell battery positive terminal to terminal No. 6 and dry-cell battery ground terminal to terminal No. 8, circuit tester positive terminal to terminal No. 7 and the circuit tester ground terminal to terminal No. 8.

NOTE:

• Use new dry-cell batteries.

• Using circuit tester, check that the initial voltage of a single dry-cell battery is 1.6 V or more. And also check that the voltage of three batteries in series is between 4.8 V and 5.2 V.

• For power supply, 5 V DC voltage source can also be used.

2. Check the voltage at a normal atmospheric pressure.

NOTE:

The atmospheric pressure at higher altitude is lower than normal. Therefore, the voltage is lower than the standard value.

Terminal No.	Standard
7 (+) and 8 (−)	Approx. 3.5 V (when 25°C (77°F))

3. Connect the battery positive terminal to terminal No. 3 and the battery ground terminal to terminal No. 4, and check that there is a voltage drop from the voltage measured in step 2) when the vacuum pump is operated.

4. OTHER INSPECTIONS

Check that the leak check valve assembly has no deformation, cracks or other damages.

Specification

Refer to “Canister” for removal and installation of the leak check valve assembly. Canister > REMOVAL Canister > INSTALLATION ...

Pcv hose

...

Other materials:

Inspection
Replace any faulty CVTF cooler hoses, CVTF cooler pipes and clamps found in the inspection below.1. Check that there are no CVTF or engine coolant leaks from the connections.2. Check the clamp for deformation.3. Lightly bend the CVTF cooler hose and check for cracks in the surface or other damages.4 ...