Evap System: Diagnosis Honda S2000 AP1

DTC Troubleshooting

DTC INDEX

EVAP Two Way Valve Test

Special Tools Required

1. Vacuum/pressure gauge, 0-4 in.Hg 07JAZ-001000B
2. Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available

Scheme 17

Scheme 18

1. Remove the fuel fill cap.
2. Disconnect the vapor line from the EVAP two way valve (A). Connect it to a T-fitting (B) from the vacuum gauge and a commercially available vacuum pump/gauge, 0-30 in.Hg, as shown.
3. Apply vacuum slowly and continuously while watching the gauge. The vacuum should stabilize momentarily at 0.8-2.1 kPa (0.2-0.6 in.Hg, 6-16 mmHg). If the vacuum stabilizes (valve opens) below 0.8 kPa (0.2 in.Hg, 6 mmHg) or above 2.1 kPa (0.6 in.Hg, 16 mmHg), install a new valve and retest.
4. Move the vacuum pump hose from the vacuum fitting to the pressure fitting, and move the vacuum gauge hose from the vacuum side to the pressure side (A) as shown.
5. Slowly pressurize the vapor line while watching the gauge. The pressure should stabilize momentarily above 1.0 kPa (0.3 in.Hg, 8 mmHg). If the pressure momentarily stabilizes (valve opens) above 1.0 kPa (0.3 in.Hg, 8 mmHg), the valve is OK. If the pressure stabilizes below 1.0 kPa (0.3 in.Hg, 8 mmHg), install a new valve and retest.

Fuel Tank Vapor Control Valve Test

Special Tools Required

Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available

Scheme 19

1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap to relieve the fuel tank pressure, then reinstall the cap.
3. Remove the fuel pipe cover. Disconnect the fuel tank vapor recirculation tube (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the hose.
4. Plug the fuel tank vapor recirculation pipe (B).
5. Apply vacuum to the fuel tank vapor recirculation tube (A). If the vacuum holds, replace the fuel tank vapor control valve (see «FUEL TANK VAPOR CONTROL VALVE REPLACEMENT»(ref-221336-S11004294392006022400000) ). If the vacuum does not hold, the float is OK. Go to step 1 of the valve test.

Scheme 20

Scheme 21

Scheme 22

1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap.
3. Remove the fuel pipe cover. Disconnect the fuel tank vapor signal tube (A).
4. Disconnect the vacuum hoses (A) from the EVAP canister (B), and then plug the ports with plugs (C).
5. Disconnect the vacuum hose (D) from the EVAP canister vent shut valve (E), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the EVAP canister vent shut valve.
6. Pump the vacuum pump 80 times. If the vacuum holds, go to step 7. If the vacuum does not hold, go to step 9 .
7. Connect a second vacuum pump/gauge to the fuel tank vapor signal tube (A).
8. Apply vacuum (1 pump) to the fuel tank vapor signal tube (A), then check the vacuum on the pump in step 6 . If the vacuum holds, replace the fuel tank vapor control valve (see «FUEL TANK VAPOR CONTROL VALVE REPLACEMENT»(ref-221336-S11004294392006022400000) ). If the vacuum is released, the fuel tank vapor control valve is OK.
9. Disconnect the fuel tank vapor quick disconnect from the EVAP canister, then plug the port on the canister. Reapply vacuum (80 pumps). If the vacuum holds, replace the fuel tank vapor control valve (see «FUEL TANK VAPOR CONTROL VALVE REPLACEMENT»(ref-221336-S11004294392006022400000) ). If the vacuum does not hold, inspect the EVAP canister vent shut valve O-ring. If the O-ring is OK, replace the EVAP canister and repeat step 4 .

Scheme 23

1. Remove the fuel tank (see «FUEL TANK REPLACEMENT»(ref-221332-S02834578022006022400000) ).
2. Remove the fuel tank vapor control valve (A) from the fuel tank (B).
3. Replace the base gasket (C).
4. Install the fuel tank vapor control valve (A).
5. Install the fuel tank.