Component Inspection
INSPECTION1. INSPECT VENTILATION VALVE SUB-ASSY
a. Install a clean hose to the ventilation valve.
b. Inspect the 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 harmful.
2. Blow air into the intake manifold side, and check that air passes through with difficulty.
If operation 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 cracks or damage.
b. Inspect the 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.
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.
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 in from the purge port.
If operation is not as specified, replace the charcoal canister.
c. Inspect 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 checked should be performed with the CCV terminal port held closed by hand. If operation is not as specified, replace the charcoal canister.
d. Inspect 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 vacuum to drop.
Vacuum drop time: 10 sec. or more
If operation is not as specified, replace the charcoal canister.
4. Reinstall the air hose between ports A and B.
e. Inspect VSV for open circuit.
1. Using an ohmmeter, measure resistance between the terminals.
If the resistance is not as specified, replace the charcoal canister.
f. Inspect VSV operation.
1. Check that air flows from port A to ports B and C.
2. Apply battery positive voltage across the terminals.
3. Check that the valve is closed.
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 operation is not as specified, replace the charcoal canister.
4. INSPECT VACUUM SWITCHING VALVE ASSY NO.1
a. Inspect the VSV for open circuit.
1. Using an ohmmeter, check measure resistance between the terminals.
Resistance: 27 to 33 Ohms at 20 °C (68 °F)
If the resistance is not as specified, replace the VSV.
b. Inspect the VSV for ground.
1. Using an ohmmeter, check that there is no continuity between each terminal and the body.
If there is continuity, replace the VSV.
c. Inspect the VSV operation.
1. Check that air does not flow from parts.
2. Apply battery positive voltage across the terminals.
3. Check that air flows from the ports.
If operation is not as specified, replace the VSV.
5. INSPECT AIR FUEL RATIO SENSOR
a. Using an ohmmeter, measure the resistance between the terminals.
If the resistance is not as specified, replace the sensor.
6. INSPECT HEATED OXYGEN SENSOR (BANK1 OXYGEN SENSOR NO.2)
a. Using an ohmmeter, measure the resistance between the terminals.
If the resistance is not as specified, replace the sensor.
7. INSPECT HEATED OXYGEN SENSOR (BANK2 OXYGEN SENSOR NO.2)
a. Using an ohmmeter, measure the resistance between the terminals.
8. INSPECT HEATER RELAY
a. Continuity inspection.
1. Using an ohmmeter, check for continuity between the terminals.