Auxiliary Emission Control Systems: Canister: Inspection

Inspect Charcoal Canister Assembly

CAUTION: When applying vacuum, the needle may waver but, as long as the needle returns to its initial position immediately, it is not a malfunction.

Visually check the charcoal canister assembly for cracks or damage.
If cracks or damage is found, replace the charcoal canister assembly.

Check the air flow.

Fig 1: Identifying Charcoal Canister Assembly Ports

Courtesy of SUBARU OF AMERICA, INC.

Measurement Condition	Specified Condition
Ports B and C closed, and vacuum applied to port A (2 kPa [15 mmHg, 0.590 in.Hg])	No air leaks
Port C closed, and vacuum applied to port A (2 kPa [15 mmHg, 0.590 in.Hg])	Air flows from port B
Port C closed and air blown into port A (5 kPa [0.1 kgf/cm² , 0.725 psi])	Air flows from port B
Air blown into port A (5 kPa [0.1 kgf/cm² , 0.725 psi])	Air flows from ports B and C

If the result is not as specified, replace the charcoal canister assembly.

INSPECT CANISTER PUMP MODULE

Measure the resistance according to the value in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
1 - 5	20°C (68°F)	25 to 30 Ω
1 - 5	60°C (140°F)	27 to 35 Ω

Fig 2: Canister Pump Module Connector Terminal Identification

Courtesy of SUBARU OF AMERICA, INC.

Check the operation of the check valve.

Install a clean hose to the purge control solenoid valve.
Check that air flows from port A to port B.

Fig 3: Checking Purge Control Solenoid Valve Air Flows
Courtesy of SUBARU OF AMERICA, INC.
Connect the positive (+) lead of the battery to terminal 5 and the negative (-) lead to terminal 1.
Check that air does not flow from port A to port B.

Fig 4: Connecting Positive Battery Lead To Terminal 5 And Negative Lead To Terminal 1
Courtesy of SUBARU OF AMERICA, INC.
Connect the positive (+) lead of the battery to terminal 3 and the negative (-) lead to terminal 4.

Fig 5: Connecting Positive Battery Lead To Terminal 3 And Negative Lead To Terminal 4
Courtesy of SUBARU OF AMERICA, INC.
Check that the vacuum pump operates.
CAUTION: Do not operate vacuum pump for 5 minutes or more.
Connect the positive (+) lead of the battery to terminal 6 and the negative (-) lead to terminal 8.

Fig 6: Connecting Positive Battery Lead To Terminal 6 And Negative Lead To Terminal 8
Courtesy of SUBARU OF AMERICA, INC.
NOTE:
- Use new dry-cell batteries.
- Using a circuit tester, check that the initial voltage of a single dry-cell battery is 1.6 V or more. Also check that the voltage of the three batteries in position is within the range from 4.8 to 5.2 V.

Measure the voltage according to the value in the table below.

Standard Voltage

STANDARD VOLTAGE

Tester Connection	Condition	Specified Condition
7 - 8	25°C (77°F)	Approx. 3.5 V

Connect the positive (+) lead of the battery to terminal 6 and the negative (-) lead to terminal 8.

Fig 7: Connecting Battery Positive Lead To Terminal 6 And Negative Lead To Terminal 8
Courtesy of SUBARU OF AMERICA, INC.
NOTE:
- Use new dry-cell batteries.
- Using a circuit tester, check that the initial voltage of a single dry-cell battery is 1.6 V or more. Also check that the voltage of the three batteries in position is within the range from 4.8 to 5.2 V.
- V of power supply may be supplied through DC constant voltage source.
Connect the positive (+) lead of the battery to terminal 3 and the negative (-) lead to terminal 4. Check that the voltage drops slightly from 3.5 volts.