Examination (except engines D14A3, D14A4)
1. Remove the fuel tank cap.
2. Start the engine and leave it idling.
3. Disconnect the vacuum hose from the evaporative control diaphragm valve and connect the vacuum sensor to the hose.
If there is no vacuum, check the vacuum hose and fitting for blockage, leakage or damage.
4. Disconnect the vacuum sensor and reattach the hose.
5. Connect the vacuum sensor to the air hose of the ventilation system.
6. Increase engine speed to 3500.
The sensor should indicate the presence of vacuum within one minute.
If vacuum appears, remove the sensor - the test is completed.
If there is no vacuum, disconnect the vacuum sensor and replace the tank plug.
7. Remove the EVAP reserve tank and inspect for signs of defects or damage.
8. Stop the engine. Disconnect the upper hose from the purge control diaphragm valve. Attach a vacuum pump to the lower hose and pump up the vacuum.
The vacuum must be stable.
Vacuum drops, replace EVAP reserve tank and recheck.
9. Start the engine, attach the upper vacuum hose to its place. Vacuum (in the lower hose) should drop to zero.
* If the vacuum has not dropped to zero, replace the EVAP reserve tank and recheck.
Checking the dual-port EVAP valve
1. Remove the fuel tank cap.
2. Disconnect the evaporative hose from the two-port valve and connect it to the pressure/vacuum sensor and vacuum pump via a T-adapter as shown in the figure.
3. Pump up the vacuum slowly and continuously while watching the sensor. The vacuum should stabilize for short intervals at a value of 07-2.0 kPa (5-15 mm R.S.).
If the vacuum stabilizes (valve opens) below 0.7 kPa or above 2.0 kPa, replace the valve and recheck.
4. Switch the hose to the vacuum pump discharge port and the pressure input from the sensor to the T-adapter as shown in the figure.
5. Slowly inflate the pressure while observing the gauge. The pressure should stabilize at a value of 1.3-47 kPa (10-35 mm R.S.).
If the pressure briefly stabilizes temporarily (valve opens) within the specified limits, the valve is OK.
If the pressure stabilizes below or above the specified zone, replace the valve and recheck.