Evap System (4-CYL): Diagnosis Honda Accord VIII

DTC P145C: EVAP System Purge Flow Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P145C is indicated alone, do the troubleshooting for DTC P0496 and P0497 using freeze data for P145C. If DTC P0497 and P145C are stored at the same time, check for a poor connection, a blockage, or damage at the EVAP canister purge line between the EVAP canister purge valve and the EVAP canister. Also check for a stuck closed EVAP canister purge valve. If any of the DTCs listed below are indicated at the same time as DTC P145C, troubleshoot those DTCs first, then recheck for P145C. P0496, P0497: EVAP system purge flow

Fuel Cap Warning Message System Troubleshooting

Special Tools Required

1. Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available
2. Vacuum/Pressure Gauge, 0-4 inHg 07JAZ-001000B

Do this procedure if the fuel cap warning message comes on frequently, or if the message does not go off after the fuel fill cap is tightened and the vehicle is driven several days.

Scheme 1224

Scheme 1225

1. Check the fuel fill cap (the cap must say TIGHTEN TO CLICK). It should turn 1/4 after it's tight, then it clicks. Is the correct fuel fill cap installed and properly tightened? YES -Go to step 2. NO -Replace or tighten the cap, then go to step 13 .
2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B). Verify that the fuel fill cap tether cord (C) is not caught under the cap. Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is the tether cord caught under the cap? YES -Replace the fuel fill cap or the fuel fill pipe, then go to step 13 . NO -Go to step 3.
3. Reinstall and tighten the fuel fill cap.
4. Clear the DTC with the HDS.
5. Start the engine. Hold the engine speed at 3,000 RPM without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 1 minute.
6. Test drive at 45 mph (72 km/h) for 1 minute or more. Does fuel cap warning message come on? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time.
7. Turn the ignition switch to LOCK (0).
8. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) in the engine compartment, then connect a T-fitting (C), a vacuum gauge, and a vacuum pump/gauge, 0-30 inHg, to the EVAP canister purge valve as shown.
9. Turn the ignition switch to ON (II).
10. Apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the hose.
11. Select the EVAP PCS ON in the INSPECTION MENU with the HDS. Does the vacuum release immediately? YES -Check for a blockage in the EVAP canister purge line between the EVAP canister purge valve and the EVAP canister, then go to step 12. NO -Replace the EVAP canister purge valve (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(ref-424914-S33526633392011100100000) ), then go to step 12.
12. Reconnect all hoses.
13. Turn the ignition switch to ON (II).
14. Reset the ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-424898-S27503289542011100100000) ).
16. Start the engine. Hold the engine speed at 3,000 RPM without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 1 minute.
17. Test-drive at 45 mph (72 km/h) for 1 minute or more. Does the fuel cap message come on? YES -Go to step 1 and recheck. NO -Troubleshooting is complete.

Scheme 1226

Scheme 1227

Scheme 1228

Scheme 1229

Scheme 1230

1. Raise the vehicle on a lift.
2. Remove the wheel sensor harness clamps (A)
3. Support the rear subframe with a transmission jack and a wooden block as shown.
4. Remove the rear subframe mounting bolts (B) and (C).
5. Lower the transmission jack and rear subframe about 50 mm. NOTE: Be careful not to damage the connecting parts.
6. Remove the bolt (A), and disconnect the hoses (B), the EVAP canister vent shut valve 2P connector (C), and the FTP sensor 3P connector (D).
7. Remove the bolts (E), then remove the EVAP canister assembly (F).
8. Remove the EVAP canister (A) from the EVAP canister bracket (B).
9. Remove the EVAP canister vent shut valve (A) and FTP sensor (B) from the canister (C).
10. Reassemble the EVAP canister with new O-rings (D), a new retainer (E), and a new cap (F), then install the EVAP canister bracket. NOTE: Do not coat the O-rings with oil.
11. Install the EVAP canister assembly to the body. NOTE: Attach the bracket arm (A) to the body as shown.
12. Install the parts in the reverse order of removal. Use new bolts when you install the rear subframe.
13. Check the wheel alignment (see «WHEEL ALIGNMENT»(ref-424876-S29503753732011100100000) ).

Scheme 1231

Scheme 1232

1. Remove the bolt (A), and disconnect the EVAP canister vent shut valve 2P connector (B), the FTP sensor 3P connector (C), and the hoses (D).
2. Remove the bolts (E), and move the EVAP canister assembly (F) to the rear.
3. Remove the FTP sensor (A).
4. Install the parts in the reverse order of removal with a new O-ring (B) and a new retainer (C).

Scheme 1233

1. Disconnect the EVAP canister vent shut valve 2P connector (A).
2. Remove the cap (B).
3. Remove the EVAP canister vent shut valve (C).
4. Install the parts in the reverse order of removal with new O-rings (D) and a new cap. NOTE: Do not coat the O-rings with oil.

Scheme 1234

1. Disconnect the EVAP canister purge valve 2P connector (A).
2. Disconnect the hoses (B), then remove the EVAP canister purge valve (C).
3. Install the parts in the reverse order of removal.