Evaporative System Test

Evaporative system test outline
- To verify DTC P0442 or P0455 repair, Drive Mode 4 or Evaporative System Test must be performed.
- The Evaporative system test can be performed using the NGS tester instead of driving the vehicle.

Evaporative system test description
The PCM Evaporative (EVAP) system monitoring function is activated using the NGS tester. During monitoring, the PCM controls:
- Canister drain cut valve (CDCV)
- Purge control solenoid valve (PRGV) and stores fuel tank pressure (FTP) value as follows:




1. The PCM opens PRGV to apply vacuum to EVAP system and closes CDCV to shut off the EVAP lines the atmosphere.
2. When the vacuum in the EVAP system has reached a preset level or a preset time has passed, the PCM closes PRGV to seal the EVAP system.




3. The PCM will maintain this sealed condition for about 33 seconds while recording the FTP1SV and FTP2SV at each preset time interval.

Evaporative system test procedure

NOTE: This is an alternative procedure for the dealers that cannot drive the vehicle in OBD-II Drive 4 Procedure.

1. Turn the ignition switch on.




2. After setting up the NGS tester for the current vehicle, select DIAGNOSTIC DATA LINK and press TRIGGER.




3. Select PCM - POWERTRAIN CONTROL MODULE and press TRIGGER.




4. Select PID/DATA MONITOR AND RECORD and press TRIGGER.
5. Press Number 5 under CLEAR to clear previously selected PIDs.

NOTE: PID screen will vary with different models.




6. Turn the menu dial clockwise to select BARO by pressing TRIGGER.




7. Turn the menu dial clockwise to select ECT, FTL V, and IAT by pressing TRIGGER.




8. Push Number 7 under START to view PIDs.




9. Record the data values for BARO, ECT, FTL V, and IAT.
- Verity all following PIDs are within the specifications.
- If not as specified, wait until PIDs are with in the specifications.

NOTE: To successfully perform this procedure, all PIDs must be within the following specifications before proceeding to next step.

10. Start the engine and race it at 3,500 rpm for 200 seconds to warm it up completely.
11. Press CANCEL two times.




12. Select DIAGNOSTIC SUPPORT PROCEDURE and press TRIGGER.




13. Select SINGLE TEST and press TRIGGER.




14. Select "EVAP LEAK TEST" in the second screen and press TRIGGER.




15. Press TRIGGER one more time to start the evaporative system test.

NOTE:
- The engine revolutions will increase to about 2,000 rpm in 30 to 60 seconds.
- If you depress the accelerator pedal during test, the test will stop and tail.
- If you press the CANCEL, TEST ABORTED screen appears, but engine revolutions do not decrease. Wait until engine revolutions decrease to idle.
- The NGS tester screen should show as follows.







16. Verify that each result is within the specifications in the table or graphs, using the BARO PID value recorded in Step 9.

17. Scroll one line.







Large leak threshold value (Pa)
26 - 30 °C {79 - 86 °F}
25 °C {77 °F} or below







Small leak threshold value (Pa)
26 - 30 °C {79 - 86 °F}
25 °C {77 °F} or below




18. If NGS values are out of range, use the above procedure in DTC troubleshooting to diagnose the problem.
19. Clear pending or stored DTC.