Component Inspection
INSPECTION1. INSPECT VENTILATION VALVE SUB-ASSY
a. Install a clean hose to the ventilation valve.
b. Check ventilation valve operation.
1. Blow air into the cylinder head side, and check that air passes through easily.
CAUTION: Do not suck air through the valve. Petroleum substances inside the valve are dangerous to your health.
2. Blow air into the intake manifold side, and check that air passes through with difficulty.
If the result is not as specified, replace the ventilation valve.
c. Remove the clean hose from the ventilation valve.
2. INSPECT FUEL TANK CAP ASSY
a. Visually check if the cap and gasket are deformed or damaged.
3. INSPECT CHARCOAL CANISTER ASSY
a. Visually check the charcoal canister for cracking or damage.
If cracking or damage is found, replace the charcoal canister assy.
b. Check charcoal canister operation.
1. While holding the purge port closed, blow air (0.39 kPa (4.0 gf/sq.cm, 0.06 psi)) into the vent port, and check that air flows from the air inlet port.
If the result is not as specified, replace the charcoal canister.
2. While holding the air inlet port closed, blow air (0.39 kPa (4.0 gf/sq.cm, 0.06 psi)) into the vent port, and check that air flows from the purge port.
If the result is not as specified, replace the charcoal canister.
3. While holding the air inlet port closed, apply vacuum (3.43 kPa (25.7 gf/sq.cm, 1.01 psi)) to the vent port, and check that air is sucked into the purge port.
If the result is not as specified, replace the charcoal canister.
c. Check the air tightness.
1. While holding the vent and air inlet ports closed, apply vacuum (3.43 kPa (25.7 gf/sq.cm, 1.01 psi)) to the purge port, and check that the vacuum is maintained for 1 minute.
HINT: In order to maintain air tightness, the check should be performed while holding the VSV terminal port closed.
If the result is not as specified, replace the charcoal canister.
d. Check the diaphragm.
1. Remove the air hose between ports A and B.
2. While holding the vent, purge and air inlet ports closed, apply vacuum (1.42 kPa (11 mmHg, 0.42 in.Hg)) into port A, and check that air is sucked in from port B.
3. While holding the vent, purge and air inlet ports closed, apply vacuum (1.42 kPa (11 mmHg, 0.42 in.Hg)) into port A, and measure how long it takes for the vacuum pressure to decrease.
Vacuum pressure decrease time: 10 seconds or more
If the result is not as specified, replace the charcoal canister.
4. Reinstall the air hose between ports A and B.
e. Check if the VSV has an open circuit.
1. Measure the resistance between the terminals.
If the result is not as specified, replace the charcoal canister.
f. Check VSV operation.
1. Check that air flows from port A to ports B and C.
If the result is not as specified, replace the charcoal canister.
2. Apply battery positive voltage across the terminals.
3. Check that the valve closes.
If the result is not as specified, replace the charcoal canister.
4. Check that air does not flow from port A to port B.
5. Check that air flows from port A to port C.
If the result is not as specified, replace the charcoal canister.
4. INSPECT VACUUM SWITCHING VALVE ASSY FOR EVAP
a. Check the VSV for open circuit.
1. Measure the resistance.
If the resistance is not as specified, replace the VSV assy.
b. Check VSV operation.
1. Check that air does not flow from the port as shown in the illustration.
2. Apply battery positive voltage across the terminals.
3. Check that air flows from the port as shown in the illustration.
If the result is not as specified, replace the VSV assy.
5. INSPECT AIR-FUEL RATIO SENSOR
a. Measure the resistance between terminals 1 (HT) and 2 (+B).
If the result is not as specified, replace the sensor.
6. INSPECT HEATED OXYGEN SENSOR (BANK 1 SENSOR 2)
a. Measure the resistance between terminals 1 (HT) and 2 (+B).
If the result is not as specified, replace the sensor.
7. INSPECT HEATED OXYGEN SENSOR (BANK 2 SENSOR 2)
a. Measure the resistance between terminals 1 (HT) and 2 (+B).
If the result is not as specified, replace the sensor.