Acura CSX. Manual — part 180

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11-388

EVAP System

A

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15. Turn the ignition switch to LOCK (0).

16. Disconnect the vacuum pump/gauge from the

EVAP canister purge valve.

17. Reconnect the vacuum hose (engine side) (A) to the

EVAP canister purge valve (B) and disconnect the
vacuum hose (EVAP canister side) (C) from the
EVAP canister purge valve, then connect a vacuum
pump/gauge 0

30 in.Hg, to the vacuum hose as

shown.

18. Turn the ignition switch to ON (II).

19. Apply vacuum to the hose until the FTP reads

1.90 V (

15.1 mmHg,

0.59 in.Hg).

NOTE: Be careful not to exceed the vacuum. If you
do, the FTP sensor can be damaged.

20. Monitor the FTP SENSOR in the DATA LIST for

1 minute with the HDS.

Go to step 21.

Replace the EVAP canister purge valve

(see page 11-409), then go to step 29.

21. Check for a loose or damaged EVAP canister purge

line between the EVAP canister and the EVAP
canister purge valve or a leaking the EVAP canister.

Replace these parts, then go to step 29:

• FTP sensor O-ring
• EVAP canister vent shut valve case and O-ring
• EVAP canister

Reconnect or repair the EVAP canister purge

line, then go to step 29.

22. Reconnect the fresh air hose (A) to the EVAP

canister (B).

*: This illustration shows K20Z2 engine.

Does the voltage incr ease mor e than 0.2 V
( 2.5 mmHg, 0.1 in.Hg)?

Ar e the line and the EV AP canister OK ?

08/08/21 14:32:37 61SNR030_110_0388

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11-389

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23. Reconnect the vacuum hose (engine side) (A) to the

EVAP canister purge valve (B) and disconnect the
vacuum hose (EVAP canister side) (C) from the
EVAP canister purge valve, then connect a vacuum
pump/gauge 0

30 in.Hg, to the vacuum hose as

shown.

24. Select EVAP CVS ON in the INSPECTION MENU

with the HDS.

25. Apply vacuum to the EVAP system until the FTP

reads 1.90 V (

0.59 in.Hg,

15.1 mmHg).

NOTE: Be careful not to exceed the vacuum. If you
do, the FTP sensor can be damaged.

26. Monitor the FTP SENSOR in the DATA LIST for

1 minute with the HDS.

Replace the EVAP canister vent shut valve

(see page 11-409), then go to step 29.

Go to step 27.

27. Select EVAP CVS OFF in the INSPECTION MENU.

28. Check these parts for looseness or damage:

• Fuel fill pipe
• Fuel vapor return pipe

Check the fuel tank unit base gasket

(see page 11-335), and check the fuel tank, then go
to step 29.

Repair or replace the damaged parts, then go

to step 29.

29. Reconnect all hoses and connectors.

30. Turn the ignition switch to ON (II).

31. Reset the ECM/PCM with the HDS.

32. Do the ECM/PCM idle learn procedure (see page

11-310).

33. Do the EVAP FUNCTION TEST in the INSPECTION

MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs are indicated, go to the
indicated DTC’s troubleshooting.

Check for poor connections or loose terminals

at the FTP sensor, the EVAP canister purge valve,
the EVAP canister vent shut valve, and the ECM/
PCM, then go to step 1.

*: This illustration shows K20Z2 engine.

Does the voltage incr ease mor e than 0.2 V
( 2.5 mmHg, 0.1 in.Hg)?

Ar e the par ts OK ?

Is the r esult OK ?

08/08/21 14:32:38 61SNR030_110_0389

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DTC P0457:

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11-390

EVAP System

A

B

C

A

EVAP System Leak Detected/Fuel

Fill Cap Loose or Missing

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

1. Check the fuel fill cap (the cap must say TIGHTEN

TO CLICK). It should turn 1/4 turn after it’s tight,
then it clicks.

Go to step 2.

Replace or tighten the cap, then go to step 19.

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.

Replace the fuel fill cap or the fuel fill pipe,

then go to step 19.

Go to step 3.

3. Turn the ignition switch to ON (II).

4. Clear the DTC with the HDS.

5. Do the EVAP FUNCTION TEST in the INSPECTION

MENU with the HDS.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the FTP sensor or the EVAP canister vent shut
valve and the ECM/PCM.

Go to step 6.

6. Turn the ignition switch to LOCK (0).

7. Remove the EVAP canister vent shut valve from the

EVAP canister (see page 11-409).

8. Connect the 2P connector to the EVAP canister vent

shut valve.

9. Turn the ignition switch to ON (II).

10. Select EVAP CVS ON in the INSPECTION MENU

with the HDS.

11. Check the EVAP canister vent shut valve (A)

operation.

Check the routing of the EVAP canister vent

tube, then go to step 18.

Go to step 12.

Is the cor r ect f uel f ill cap installed and pr oper ly
tightened?

Is the f uel f ill cap seal missing or damaged, is the
f uel f ill pipe damaged, or is the tether cor d caught
under the cap?

Is the r esult OK ?

Does the valve oper ate?

08/08/21 14:32:38 61SNR030_110_0390

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DTC P0496:

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11-391

12. Turn the ignition switch to LOCK (0).

13. Replace the EVAP canister vent shut valve

(see page 11-409).

14. Turn the ignition switch to ON (II).

15. Reset the ECM/PCM with the HDS.

16. Do the ECM/PCM idle learn procedure (see page

11-310).

17. Do the EVAP FUNCTION TEST in the INSPECTION

MENU with the HDS.

Troubleshooting is complete.

Check for poor connections or loose terminals

at the FTP sensor, the EVAP canister vent shut
valve, and the ECM/PCM, then go to step 1.

18. Reinstall the EVAP canister vent shut valve.

19. Turn the ignition switch to ON (II).

20. Reset the ECM/PCM with the HDS.

21. Do the ECM/PCM idle learn procedure (see page

11-310).

22. Do the EVAP FUNCTION TEST in the INSPECTION

MENU with the HDS.

Troubleshooting is complete.

Check for poor connections or loose terminals

at the FTP sensor, the EVAP canister vent shut
valve, and the ECM/PCM, then go to step 1.

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Do the EVAP FUNCTION TEST in the INSPECTION

MENU with the HDS.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the FTP sensor, the EVAP canister purge valve,
the EVAP canister vent shut valve, and the ECM/
PCM.

Go to step 4.

4. Turn the ignition switch to LOCK (0).

5. Replace the EVAP canister purge valve (see page

11-409).

6. Turn the ignition switch to ON (II).

7. Reset the ECM/PCM with the HDS.

8. Do the ECM/PCM idle learn procedure (see page

11-310).

9. Do the EVAP FUNCTION TEST in the INSPECTION

MENU with the HDS.

Troubleshooting is complete.

Check for poor connections or loose terminals

at the FTP sensor, the EVAP canister purge valve,
the EVAP canister vent shut valve, and the ECM/
PCM, then go to step 1.

EVAP System High Purge Flow

Detected

Is the r esult OK ?

Is the r esult OK ?

Is the r esult OK ?

Is the r esult OK ?

08/08/21 14:33:20 61SNR030_110_0391