Canada - Engine Controls - MIL ON/DTC's P0171/P0174 Set

Bulletin
TSB2074

Issue Date
August 25, 2004

Market
Canada



Title
M.I.L. "ON" DTC P0171 AND/OR P0174 ENGINE RUNNING LEAN

Component
ENGINE ELECTRICAL

Models
'04 Camry (1MZ-FE/3MZ-FE), Solara & Sienna (3MZ-FE)


Some 2004 model year Camry, Solara and Sienna vehicles may exhibit a M.I.L. "ON" condition with one or both of the following Diagnostic Trouble Codes stored as a result of a vacuum leak in the Intake Air Control Valve.
- P0171 (System Too Lean [Bank 1])
- P0174 (System Too Lean [Bank 2])

APPLICABLE VEHICLES:
- 2004 model year Camry (1MZ-FE/3MZ-FE), Solara and Sienna (3MZ-FE) vehicles produced BEFORE the Production Change Effective VINs shown below.
















PRODUCTION CHANGE INFORMATION:






PARTS INFORMATION:






WARRANTY INFORMATION:






REQUIRED SSTS:

REPAIR PROCEDURE:







1. Monitor the Bank 1 & Bank 2 Short Term Fuel Trim in the Data List.







2. Spray carburetor cleaner near the Intake Air Control Valve pivot shaft and monitor Short Term Fuel Trim as indicated in step 1.
3. Was the short term fuel trim changing to a rich reading, or negative fuel trim in step 2?

If Yes -- Replace the Intake Air Control Valve. Refer to ETAS, 2004 model year Applicable Model Repair Manual: Section: Intake; Subsection: Intake Air Control Valve Assy No. 2 (3MZ-FE); Replacement.

After the Intake Air Control Valve has been replaced, proceed to step 4.

If NO -- Check for other vacuum leaks or lean running conditions per ETAS, 2004 model year Applicable Model Repair Manual:
Section: Diagnostics; Subsection: SFI System (1MZ-FE/3MZ-FE) or (3MZ-FE): P0171, P0172, P0174, P0175 System Too Lean

4. Is the short term fuel trim now in the negative %? Is the long term fuel trim returning closer to 0%?

If Yes - Clear short and long term fuel trims by disconnecting the negative battery cable for 90 seconds. Reconnect the negative battery cable and test drive the vehicle.

After the test drive, proceed to step 5.

If NO -- Continue diagnosis for lean running conditions per ETAS, 2004 model year Applicable Model Repair Manual:
Section: Diagnostics; Subsection: SFI System (1MZ-FE/3MZ-FE) or (3MZ-FE): P0171, P0172, P0174, P0175 System Too Lean.

5. Confirm lean running condition has been eliminated (short term fuel trims on all data--list less than 3% on both banks).

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.