## EVAP System Troubleshooting

Special Tools Required
Combination gauge kit ( 07YAJ-0010610)

Tube joint adapter ( 07410-5790501)

1. | Inspect the No. 16 (7.5A) fuse in the under-dash fuse/relay box. Is fuse OK? YES - Go to 2. NO - Replace the fuse, and recheck.n

2. | Disconnect the vacuum hose (A) and connect a vacuum pump/gauge (B) to the hose.

3. | Start the engine and let it idle. NOTE: Engine coolant temperature must be below 65°C (149°F).

4. | Quickly raise the engine speed to 3,000 rpm (min-1). Is there vacuum? YES - Go to 5. NO - Go to 10.

5. | Disconnect the EVAP canister purge valve 2P connector.

6. | Quickly raise the engine speed to 3,000 rpm (min-1). Is there vacuum? YES - Inspect vacuum hose routing. If OK, replace the EVAP canister purge valve.n NO - Go to 7.

7. | Turn the ignition switch OFF.

8. | Disconnect PCM connector B (24P).

9. | Check for continuity between EVAP canister purge valve 2P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the EVAP cansiter purge valve and the PCM (B21).n NO - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.n

10. | Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.

11. | Check for vacuum at the vacuum hose after the starting the engine.

12. | Quickly raise the engine speed to 3,000 rpm (min-1). Is there vacuum? YES - Go to 23. NO - Go to 13.

13. | Turn the ignition switch OFF.

14. | Inspect the vacuum hose rooting. Is the vacuum hose OK? YES - Go to 15. NO - Repair the vacuum hose.n

15. | Disconnect the EVAP canister purge valve 2P connector.

16. | Turn the ignition switch ON (II).

17. | At the harness side, measure voltage between EVAP canister purge valve 2P connector terminals No. 1 and No. 2. Is there any voltage? YES - Replace the EVAP canister purge valve.n NO - Go to 18.

18. | At the harness side, measure voltage between EVAP canister purge valve 2P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to 19 NO - Repair open in the wire between No. 16 (7.5A) fuse in the under-dash fuse/relay box and the EVAP canister purge valve.n

19. | Turn the ignition switch OFF.

20. | Reconnect the EVAP canister purge valve 2P connector.

21. | Turn the ignition switch ON (II).

22. | Measure voltage between PCM connector terminal B21 and body ground. Is there battery voltage? YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.n NO - Repair open in the wire between the EVAP canister purge valve and the PCM (B21).n

23. | Reconnect the vacuum hose to the EVAP control canister.

24. | Remove the fuel fill cap.

25. | Disconnect the purge air hose (A) from the EVAP canister and connect the combination gauge kit and tube joint adapter to EVAP canister (B) and connect a vacuum pump (C).

26. | Start the engine and raise speed to 3,000 rpm (min-1). Does vacuum appear on gauge within 2 minute? YES - When vacuum is appear, evaporative emission controls are OK. Check the EVAP two way valve test.n NO - Replace the EVAP canister.n