Evap System: Other Honda S2000 AP1

Fuel Fill Cap Check

1. Check the fuel fill cap (the cap must say "If not tightened 3 clicks check engine light may come on.") Is the proper fuel fill cap installed and properly tightened? YES - Go to step 2. NO - Replace or tighten the cap.
2. Check the fuel fill cap seal and the fuel fill pipe sealing surface. Is the fuel fill cap seal missing or damaged, or Is the fill pipe damaged? YES - Replace the fuel fill cap (gray or black colored cap), or the fuel fill pipe. NO - The fuel fill cap is OK. Go to step 3.

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1. 3. Disconnect the vacuum hose from the EVAP purge joint (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the hose.
2. 4. Turn the ignition switch ON (II).
3. 5. Apply vacuum to the hose. Does the valve hold vacuum? YES - The EVAP canister purge valve is OK. Go to step 11 . NO - Go to step 6.
4. 6. Turn the ignition switch OFF.
5. 7. Disconnect the EVAP canister purge valve 2P connector.
6. 8. Check for continuity between EVAP canister purge valve 2P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 9. NO - Replace the EVAP canister purge valve.
7. 9. Disconnect ECM connector A (32P).
8. 10. 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 canister purge valve and the ECM (A6). NO - Substitute a known-good ECM (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES»(ref-221328-S04997151962006022400000) ) and recheck. If the symptom/indication goes away, replace the original ECM (see «ECM REPLACEMENT»(ref-221329-S30667517252006022400000) ).

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1. 11. Disconnect both vacuum hoses from the EVAP two way valve (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the canister port on the two way valve.
2. 12. Turn the EVAP bypass solenoid valve ON with the HDS, or connect ECM connector terminal A3 to body ground with a jumper wire.
3. 13. Turn the ignition switch ON (II).
4. 14. Apply vacuum to the hose. Does the valve hold vacuum? YES - Go to step 15. NO - Go to step 20 .
5. 16. Turn the ignition switch OFF.
6. 17. Disconnect the EVAP bypass solenoid valve 2P connector.
7. Check for continuity between EVAP bypass solenoid valve 2P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the EVAP bypass solenoid valve and the ECM (A3).
8. 18. Turn the ignition switch ON (II).
9. 19. Measure voltage between EVAP bypass solenoid valve 2P connector terminal No. 1 and body ground. Is there battery voltage? YES - Replace the EVAP bypass solenoid valve (A) and the O-rings (B). NO - Repair open in the wire between the EVAP bypass solenoid valve and the No. 6 ACG (15 A) fuse.
10. 20. Plug the upper port (A) of the EVAP two way valve.
11. 21. While monitoring FTP sensor voltage with the HDS, or measuring the voltage between ECM connector terminals A29 and C18, slowly pump the vacuum pump/gauge until the voltage drops to about 1.5 V. Does the voltage drop to 1.5 V and hold for at least 20 seconds? YES - The EVAP bypass solenoid valve/EVAP two way valve is OK. Go to step 22. NO - Repair leak from the EVAP bypass solenoid valve, EVAP two way valve, FTP sensor, or O-rings.

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1. 22. Disconnect the vacuum hose from the EVAP canister vent filter line (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the hose.
2. 23. Turn the ignition switch ON (II).
3. 24. Apply vacuum to the hose with 5 strokes of the pump. Does the valve hold vacuum? YES - Go to step 25. NO - The EVAP canister vent shut valve is OK. Go to step 30 .
4. 25. Turn the ignition switch OFF.
5. 26. Disconnect the EVAP canister vent shut valve 2P connector.
6. 27. Check for continuity between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 28. NO - Replace the EVAP canister vent shut valve (A) and the O-ring (B).
7. 28. Disconnect ECM connector A (32P).
8. 29. Check for continuity between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the EVAP canister vent shut valve and the ECM (A4). NO - Substitute a known-good ECM (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES»(ref-221328-S04997151962006022400000) ) and recheck. If the symptom/indication goes away, replace the original ECM (see «ECM REPLACEMENT»(ref-221329-S30667517252006022400000) ).

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1. 30. Perform the fuel tank vapor control valve test (see «FUEL TANK VAPOR CONTROL VALVE TEST»(ref-221336-S07660713022006022400000) ). Is the fuel tank vapor control valve OK ? YES - Go to step 31. NO - Replace the fuel tank vapor control valve.
2. 31. Tighten the fuel cap three "clicks", then monitor the FTP readings with the HDS.
3. 32. Start the engine, and let it idle for 5 minutes.
4. 33. Check the FTP sensor reading. Is the reading above 4 mmHg pressure or below - 4 mmHg vacuum? YES - Substitute a known-good ECM (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES»(ref-221328-S04997151962006022400000) ) and retest. If the symptom/indication goes away, replace the original ECM (see «ECM REPLACEMENT»(ref-221329-S30667517252006022400000) ). NO - Check these parts for vacuum leaks: Fuel tank (A) Fuel fill cap (B) Fuel fill pipe (C) Fuel tank vapor control valve (D) Fuel tank vapor recirculation valve (E) Fuel tank vapor recirculation tube (F) Fuel tank vapor signal tube (G) Fuel tank vapor control vent tube (H) Repair or replace parts as needed.