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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 can not drive the vehicle in the OBD-II Drive Mode 4.




1. Connect the SST (NGS tester) to DLC2.
2. Select NEW GENERATION STAR SETUP from main menu.
3. Select ENGLISH I METRIC UNIT SELECTION.
4. Press SI key (#4) to change units to the metric system.
5. Press CANCEL two times to go back to the main menu.
6. Access and record the BARO, ECT, FTL V and IAT PIDs.

Specifications:




7. Verify all PIDs are within specification.

NOTE:
- Best results are achieved when all PID values reach specification.
- If the test must run without PID values at the specified level, reduce the fuel temperature by cooling the fuel tank for 1 hour with a fan.

8. Start the engine and race it at 3,500 rpm for 3.3 minutes to warm it up completely.
9. Press CANCEL two times.
10. Select DIAGNOSTIC SUPPORT PROCEDURE and press TRIGGER.
11. Select SINGLE TEST and press TRIGGER.
12. Select EVAP LEAK TEST and press TRIGGER.
13. Press TRIGGER one more time to start the test.
14. Verify the engine speed increases to 2,000 rpm and wait for 1 minute.
15. Depress the accelerator pedal to end the test condition.
16. Access and record FTP1SV and FTP2SV PIDs.

Large Leak Specification (FTP1SV) (kPa):




17. Verify that FTP1SV PID are within the specification in the table according to the BARO and ECT PID values recorded in step 6.
- If FTP1SV PID is within specification, go to next step.
- If FTP1SV PID is not within specification and PID values at step 6 were within specification before testing, the EVAP system still has large leak. Repeat DTC P0455 troubleshooting.
- If FTP1SV PID is not within specification and PID values at step 6 were not within specification before testing, repeat the test after all PID values at step 6 are within specification.

18. Subtract FTP 1SV from FTP 2SV.

NOTE: When a larger negative number is subtracted from a smaller negative number, the result is a positive number. (i.e. FTP2SV - FTP1SV = -0.4 - (-0.6) = -0.4 + 0.6 = 0.2)

Small Leak Specification (FTP2SV-FTP1SV) (kPa):




19. Verify that (FTP2SV - FTP1SV) value is within the specification in table according to the BARO and ECT PID values recorded in step 6.
- If (FTP2SV - FTP1SV) is within specification, the repair is complete. Clear pending or stored DTC.
- If (FTP2SV - FTP1SV) is not within specification and PID values at step 6 were within specification before testing, the EVAP system still has malfunction. Repeat DTC P0442 troubleshooting.
- If (FTP2SV - FTP1SV) is not within specification and PID values at step 6 were not within specification before testing, repeat the test after all PID values at step 6 are within specification.
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