2021 Acura TLX MIL Is ON With DTC P0455

NHTSA ID Number: 10186939

Manufacturer Communication Number: B21-007

Summary

Service Bulletin – The MIL comes on with DTC P0455 (Evaporative Emission [EVAP] System Very Large Leak Detected) stored.

1 Affected Product

Vehicle


MAKE	MODEL	YEAR
ACURA	TLX	2021

SYMPTOM

The MIL comes on with DTC P0455 (Evaporative Emission [EVAP] System Very Large Leak Detected) stored.

POSSIBLE CAUSE

The fuel main flap unit may have stuck open, causing a DTC to set.

CORRECTIVE ACTION

Inspect the EVAP system (except the main flap unit) for leaks. If the system is OK, then replace the main flap unit.

PARTS INFORMATION

Part Name	Quantity	Part Number
Fuel Capless Unit Set	1	17060-TGV-A01
Flange Bolt (10 x 20) (SH-AWD only)	4	90165-S3V-A00
Self-Lock Nut (10 mm) (SH-AWD Only)	2	90306-TGV-A00

TOOL INFORMATION

Part Name	Quantity	Part Number
Capless Flapper Retainer	1	07AAF-TBAA200
Capless Pick	1	07AAF-TBAA300
Vacuum/Pressure Gauge	1	07JAZ-001000B
Vacuum Pump/Gauge	1	YA4000A (Snap-On) or equivalent

INSPECTION PROCEDURE

1. Connect the i-HDS to the vehicle and confirm DTC P0455 is present.

If DTC P0455 is present, go to step 2.
If DTC P0455 is not present, this bulletin does not apply. Continue with normal troubleshooting.

2. Check the vacuum at the EVAP canister purge valve using the vacuum pump. Apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the hose using the vacuum tool.

If the vacuum holds for 1 minute, continue to step 3.

NOTE: Leave the vacuum hose purge line disconnected.

If it does not hold for 1 minute, this bulletin does not apply. Continue with normal system troubleshooting.

3. Check for a poor connection or damage on the EVAP canister purge line between the canister purge valve and the canister. Also check the EVAP canister, the FTP sensor, the EVAP canister vent shut valve, and O-rings for damage.

NOTE: Vehicles with SH-AWD: Disconnect the rear stabilizer bar and slide it towards the rear of the vehicle to gain access to the hose. Keep the stabilizer bar disconnected until all checks are completed.

If conditions are ok and there is no damage, continue to step 4.
If there is damage to the components or conditions are not ok, this bulletin does not apply. Continue with normal system troubleshooting.

4. Disconnect and check the EVAP canister vent hose for a blockage or restriction.

If there isn’t a blockage or restriction, the system is normal. Continue to step 5.

NOTE: Leave the canister vent hose disconnected.

If there is a blockage or restriction, this bulletin does not apply. Continue with normal system troubleshooting.

5. Disconnect the fuel vent tube and plug the fuel vent tube and canister vent hose ports with plugs. Then, connect a vacuum pump to the vacuum hose purge line at the EVAP canister purge valve, located in the engine bay.

6. Turn the vehicle to the ON position. While watching the FTP sensor voltage in the PGM-FI data list, apply vacuum to the hose until it reads 1.90 V. Monitor the FTP sensor voltage for 1 minute.

NOTE: Be careful not to exceed the 1.90 V. If you do, the FTP sensor may be damaged.

If the FTP sensor voltage increases more than 0.2 V, the system is normal. Continue to step 7.
If it does not, this bulletin does not apply. Continue with normal system troubleshooting.

7. Reconnect the EVAP canister vent hose and keep the fuel vent tube port plugged.

8. Using the i-HDS, go to the following: PGM-FI > Function Test > EVAP TEST > Single Solenoid.

9. Select CVS ON and apply vacuum to the hose until it reads 1.90 V.

NOTE: Be careful not to exceed 1.90 V. If you do, the FTP sensor may be damaged.

10. Go to the PGM-FI data list and monitor the FTP sensor voltage.

If the FTP sensor voltage increases more than 0.2 V, the system is normal. Go to step 11.
If it does not, this bulletin does not apply. Continue with normal system troubleshooting.

NOTE: Vehicles with SH-AWD: Reinstall the sway bar and use the new hardware provided.

11. Check for a poor connection or damage on the fuel fill pipe and the fuel tank vapor recirculation tube.

If the connections are ok and there are no damages, the system is normal. Reconnect the fuel vent tube and the vacuum hose purge line. Go to REPAIR PROCEDURE.
If there are any damages or loose connections, this bulletin does not apply. Continue with normal system troubleshooting.

REPAIR PROCEDURE

1. Remove the left rear inner fender.

2. Disconnect the two cable clips from inside the trunk, then remove the fuel lid actuator assembly.

3. Remove the fuel filler adapter assembly.

4. Remove the fuel sub shutter set by breaking the tabs, then lifting up on the hole and releasing the lock tabs.

5. Slightly turn the fuel main flap unit counterclockwise using a screwdriver as shown.

NOTE: The fuel main flap unit may move only a small amount. This is normal.

6. Install the capless flapper retainer onto the fuel main flap unit as shown to keep the flap open.

7. Insert the capless pick under the lock tab and release the lock by turning the pick counterclockwise.

NOTE: The lock tab is unlocked when it folds inside the filler neck opening.

8. Turn the fuel main flap unit clockwise using a screwdriver as shown until it stops, then remove it.

9. When installing the replacement main flap unit, position it onto the filler neck with the top arrow at the 1 o’clock position.

10. Turn the assembly counterclockwise using a screwdriver until you hear a click.

11. Slightly turn the assembly clockwise to confirm that the lock tab is engaged.

NOTE: The fuel main flap assembly should not turn.

12. Install fuel sub shutter set.

13. Install the fuel filler adapter assembly.

14. Install the fuel lid actuator assembly.

15. Connect the i-HDS to the vehicle.

16. Check and clear the DTC.

1 Associated Document

Manufacturer Communications

B21-007
February 6, 2021
Version 1

https://www.nhtsa.gov/recalls?nhtsaId=10186939

MC-10186939-0001.pdf 1804.548KB

⬇ Download PDF (1.72 MB)

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