Component Inspection
INSPECTION1. INSPECT VENTILATION VALVE SUB-ASSEMBLY
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 operation is not as specified, replace the ventilation valve.
c. Remove the clean hose from the ventilation valve.
2. INSPECT FUEL TANK CAP ASSEMBLY
a. Visually check if the cap and gasket are deformed or damaged.
3. INSPECT CHARCOAL CANISTER ASSEMBLY
a. Visually check the charcoal canister for cracks or damage.
If cracks or damage are found, replace the charcoal canister assembly.
b. Check charcoal canister operation.
1. With the purge port closed, blow 1.67 kPa (17.0 gf/sq.cm, 0.24 psi) of air 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 assembly.
2. With the vent port closed, blow 1.10 kPa (11.2 gf/sq.cm, 0.16 psi) air to the air inlet port, and check that air flows from the purge port.
If the result is not as specified, replace the charcoal canister assembly.
c. Check for air leakage.
1. Remove the air hose between ports A and B.
2. Connect the pressure gauge to the vent port of the charcoal canister.
SST 09992-00242
3. While holding port B, with the purge port and the air inlet port closed and port A open, apply pressurized air 19.6 kPa (0.2 kgf/sq.cm, 2.81 psi) into the vent port, then confirm that the pressure is retained for 1 minute.
If the result is not as specified, replace the charcoal canister assembly.
d. Check the leak detection pump.
1. Remove the detection pump from the charcoal canister.
2. Check that air flows from port A to B and then C.
If the result is not as specified, replace the charcoal canister assembly.
3. Connect the positive (+) lead to terminal 7 and the negative (-) lead to terminal 6.
4. Check that the valve is closed.
If the result is not as specified, replace the charcoal canister assembly.
5. Install the detection pump.
4. INSPECT VACUUM SWITCHING VALVE NO.1
a. Check the VSV for open circuit.
1. Measure the resistance.
If the resistance is not as specified, replace the VSV assembly.
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 ports.
If the result is not as specified, replace the VSV assembly.
5. INSPECT AIR FUEL RATIO SENSOR
a. Measure the resistance between terminals 1 (HT) and 2 (+B).
6. INSPECT OXYGEN SENSOR
a. Measure the resistance between terminals 1 (HT) and 2 (+B).
If the result is not as specified, replace the sensor.