Hybrid MIL for 02 sensor

Some 2008-2009 Toyota Camry HV vehicles may exhibit a MIL-on with P2238 (oxygen sensor pumping current circuit low /Bank 1, Sensor 1) or P2237 (oxygen sensor pumping circuit open / Bank 1, Sensor 1).

An improved engine wiring harness has been developed to address this condition.

This TSB applies to vehicles built before the effective production change as follows:

MODEL              PLANT                  PRODUCTION CHANGE EFFECTIVE VIN

CAMRY              TMMK                    4T1BB46K#9U080445

                            Tsutsumi             JTNBB46K#93050540

PARTS INFORMATION

Previous p/n                Current P/N                     Part

82121-33B51                same                                wire, engine

82121-06B70                same                                wire, engine

17177-0H010                same                                gasket, int. manifold to head, No. 1

REQUIRED TOOLS

TIS Techstream P/N TSPKG1 (software version 3.01.000 or later required)

Safety gloves   00002-03100-S (small)

                        00002-03200-M (medium)

                        00002-03300-L (large)

REPAIR PROCEDURE

1. Using TIS Techstream, check for stored DTCs.
2. Verify DTC(s) P2238 and/or P2237 are present. If other A/F sensor DTCs are present along with the afore-mentioned DTCs, this TSB does not apply. Follow repair manual procedures to diagnose.
3. Follow repair manual procedures to inspect the A/F sensor heater and engine rool junction block (A/F relay). Refer to the TIS, applicable model year Camry HV repair manual.

-          2008/2009 Camry HV. Engine/Hybrid System – Engine Control – 2AZ-FXE Engine Control System: 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. It is necessary to remove the intake manifold and inverter assembly to access the engine wire harness.

-          For inverter assembly removal: 2008/2009 Camry HV, Engine/Hybrid System – Hybrid/battery Control System – P311 Hybrid Vehicle Control: Inverter with Converter: Removal.

-          For intake manifold removal: 2008/2009 Camry HV, Engine/Hybrid System – Engine Mechanical – 2AZ-FXE Engine Mechanical: Engine Assembly: Removal.

-          For inverter assembly installation: 2008/2009 Camry HV, Engine/Hybrid System – Hybrid/Battery Control System – P311 Hybrid Vehicle Control: Inverter with Converter: Installation.

-          For intake manifold installation: 2008/2009 Camry HV, Engine/Hybrid System – Engine Mechanical – 2AZ-FXE Engine Mechanical: Engine Assembly: Installation.

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