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Evaporative System Test

Evaporative System Test

Evaporative system test outline
- To verify that the problem has been fixed properly after repairs, the run Drive Cycle or evaporative system test must be performed.

Evaporative system leak inspection using leak tester

1. Perform the following SST (Evaporative Emission System Tester MZ254AT3641) self-test:

NOTE: If the tester does not work correctly during the self-test, refer to the tester operators for more detailed self test procedures.

1. Verify that the gas cylinder valve is closed and the control valve located on the tester is in the TEST position. All tester displays should be off at this time.




2. Connect the long hose (part of SST) to the tester.




3. Connect the manifold assembly (part of SST) to the long hose as shown.
4. Open the gas cylinder valve and verify the gas cylinder regulator left gauge reads 69.0 to 82.6 kPa {0.71 to 0.84 kgf/sq.cm, 10 to 12 psi} (preset at factory).
- If not, refer to the tester operators to contact tester manufacturer.

5. Press the ON/OFF switch to turn on the SST and make sure the left display reads 0.0.
6. Turn the control valve on the tester to the FILL position.
7. Verify the left display reading is within 35.4 to 35.5 cm {13.9 to 14.0 in} of water.
- If not, adjust the pressure using the regulator knob located on the right side of the tester.

8. Turn the control valve to TEST position and press the START switch.
9. After the 2-min countdown (left display) is completed, the right display shows the total pressure loss for that period. A 0.2 cm {0.5 in} of water loss is acceptable on the self-test.
- If the loss is 0.2 cm {0.5 in} or more of water, do one or more self-tests. If the test repeatedly fails, check for leaks using the ultrasonic leak detector (part of SST).

2. Press the RESET switch to set the left display reading to 0.0.




3. Connect the fuel cap test adapter (part of SST) to the manifold assembly and fuel-filler cap from the vehicle.
- If the fuel-filler cap is not a genuine part, replace it.

4. Connect the threaded test adapter (part of SST) to the manifold assembly and fuel-filler neck.
5. Connect the WDS or equivalent to the DLC-2.
6. Turn the ignition switch to the ON position (Engine off).
7. Request the PCM for on-board device control (Mode 08) using the WDS or equivalent to close the change-over valve (COV) in the EVAP system leak detection pump.

NOTE: The COV closes for 10 min unless any of the following any actions are done:

- The engine is started.
- The ignition switch is turned off.

8. Turn the control valve to the FILL position.
9. Wait (maximum 40 s) until the left display reads 34.3 to 35.5 cm {13.5 to 14 in} of water.
- If the reading is slightly below, adjust it using the regulator knob.
- If the reading is far below, the EVAP system has a large leak. Check for leaks (using the ultrasonic leak detector if necessary) and repair.

10. Turn the control valve to the TEST position and press the START switch.
11. After the 2 min countdown (left display) is completed, check the test result (the failed/passed light on the tester).
- If the green light illuminates, the EVAP system is OK.
- If the red light illuminates, the EVAP system has leakage. Check for leaks using the ultrasonic leak detector and repair.

12. Close the gas cylinder valve.
13. Turn the control valve to the FILL position.
14. Press the ON/OFF switch to turn off the tester.
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