Canada - Engine Control - MIL ON DTC P2237 P2238 P2240 P2241

Bulletin
TSB3044

Issue Date
September 19, 2008

Market
Canada

Title
M.I.L. "ON" DTC P2237, P2238, P2240, or P2241

Component
Engine Electrical

Models
2008 Avalon and 2008-2009 Camry

INTRODUCTION:

Some 2008 model year Avalon and 2008-2009 model year Camry (2GR-FE and 2AZ-FE) vehicles may exhibit a M.I.L. "ON" condition with one of the following Diagnostic Trouble Codes (DTCs):
P2238 - Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
P2237 - Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)
P2241 - Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 2 Sensor 1)
P2240 - Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 2 Sensor 1)

An improved engine wiring harness has been developed to address this condition. Use the following repair procedure to diagnose and repair customer complaint vehicles.






APPLICABLE VEHICLES:

PRODUCTION CHANGE INFORMATION:







This TSB applies to vehicles produced BEFORE the Production Change Effective VINs shown.






REQUIRED SSTS:

NOTE:
- Please contact your zone Area Parts & Service Managers to order additional Techstream units.






WARRANTY INFORMATION:






PARTS INFORMATION:

REPAIR PROCEDURES:

1. Using Techstream, check for stored DTCs.
2. Verify one of the following DTCs are present.
A. P2238 and/or P2237
B. P2241 and/or P2240

NOTE
If other A/F sensor DTCs are present along with any of the DTCs listed above, this TSB does NOT apply. Follow Repair Manual procedure to diagnose those DTCs.

3. Follow Repair Manual procedure to inspect the A/F sensor heater and Engine Room Junction Block (A/F Relay).


Refer to the Repair Manual within E-TAS / TIS library:
- Division: Toyota
- Model: Avalon/Camry (2GR-FE)
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Engine Control
- Keyword: 2GR-FE Engine Control: SFI System: P2237: Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)

- Division: Toyota
- Model: Camry (2AZ-FE)
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Engine Control
- Keyword: 2AZ-FE Engine Control: SFI System: P2237: Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)

4. If the A/F sensor heater and Engine Room Junction Block (A/F Relay) are within Repair Manual specifications, replace the engine wire harness.

NOTE
It is necessary to remove the intake manifold surge tank to access the engine wire harness on 2GR-FE vehicles. The intake manifold should be removed on 2AZ-FE engines.

HINT
On 2GR-FE engines it is NOT necessary to drain engine coolant or disconnect the water by-pass hoses from the throttle body.

Refer to the Repair Manual within E-TAS / TIS library:

For intake air surge tank removal:
- Division: Toyota
- Model: Avalon/Camry (2GR-FE)
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Fuel System
- Keyword: 2GR-FE Fuel: Fuel Injector: Removal

For intake manifold removal (2AZ-FE Only):
- Division: Toyota
- Model: Camry (2AZ-FE)
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Engine Mechanical
- Keyword: 2AZ-FE Engine Mechanical: Engine Assembly: Removal

For intake air surge tank installation (2GR-FE only):
- Division: Toyota
- Model: Avalon/Camry (2GR-FE)
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Fuel System
- Keyword: 2GR-FE Fuel: Fuel Injector: Installation

For intake manifold installation (2AZ-FE Only):
- Division: Toyota
- Model: Camry (2AZ-FE)
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Engine Mechanical
- Keyword: 2AZ-FE Engine Mechanical: Engine Assembly: Installation

5. After replacing the engine harness, clear DTCs and verify that no DTCs reset. Then warm vehicle to operating temperature and test drive to verify repair.

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.