Canada - Emissions - MIL ON/DTC's P0441/P0446

Bulletin
1055

Issue Date
2002-01-22

Reference
EE-02-001

Model
Camry

Year Range
2000, 2001

Market
Canada

Component
EE

Subject:
M.I.L "ON" P0441, P0446

Under certain driving conditions, some 2000 - 2001 model year CAMRY MCV20, SXV20 may exhibit M.I.L. "ON" with DTC P0441 or P0446 by malfunction of the VSV for pressure switching valve (By pass). An improved VSV is introduced to correct this condition.

APPLICABLE VEHICLES: 2000 - 2001 model year CAMRY vehicles.







PARTS INFORMATION:

REPAIR PROCEDURE:

LATE SYSTEM TEST PROCEDURE
- Set TDT to read mmHg a and select vapour pressure VSV only
- Check the vehicle as is (Do not tighten the gas cap or hoses prior to testing)
- Ensure that the fuel tank level is between 1/4 ~ 3/4 full

















Step 1. Fuel Tank check (figure 1)

Step 2. Canister By-Pass VSV check







- Turn on the EVAP VSV for 2 minutes to bleed down the canister & hoses. If VSV fails to operate go to step 4 and check the EVAP VSV then return to this step.
- Note the Vapour pressure reading. _________ mmHg a.

Step 3. Canister side check (figure 2)

Preparation:
A) Install the SST EVAP service port adapter (4L3-12515) at the EVAP Tee port, or fit "T" fitting.
B) Turn on the CCV VSV (Active Test).
C) Connect a Vacuum/Pressure pump to EVAP service port adapter.












D) Create 4 inHg of vacuum & confirm that it holds for at least 1 minute.

Step 4. Purge (EVAP) VSV & Hose check
- Remove the adapter and leave the valve cap off the fitting.
- Disconnect the purge hose at the canister side and plug the hand-held vacuum pump into the hose. Create 4 inHg of Vacuum in the line.
- The system should hold the vacuum for at least 1 minute.
- Use the TDT to turn ON the EVAP VSV, the vacuum should instantly drop (duty cycle).
- If drop is slow it indicates a restriction due to a kinked or pinched hose, or a sticking VSV.
- Reconnect the hose.

Step 5. Closed Canister Valve & Hose check
- Use the TDT to turn ON the CCV valve.
- Disconnect the CCV hose at the canister side and plug the hand held vacuum pump into the hose. Create 4 inHg of vacuum in the line.
- The system should hold the vacuum for at least 1 minute.
- Turn OFF the CCV, the vacuum should instantly drop.
- If drop is slow it indicates a restriction due to a kinked or pinched hose, or a sticking VSV.
- Reconnect the hose.

Step 6. Air Inlet Valve Assy check (see figure 3)







- Disconnect the short vacuum line (that runs between the tank valve assembly and the air valve assembly) at the purge port end - see image. Connect the vacuum pump to the hose and create 4 inHg of vacuum on the diaphragm.
- The valve should hold the vacuum for at least 1 minute.

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.