Canada - Engine Control - MIL ON/DTC P2237 P2238 P2240/P2241
BulletinTSB2590
Issue Date
August 26, 2008
Title
M.I.L. "ON" DTC P2237, P2238, P2240, or P2241
Component
Engine Electrical
Models
'08 ES 350
INTRODUCTION:
Some 2008 model year ES 350 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:
WARRANTY INFORMATION:
PRODUCTION CHANGE INFORMATION:
This TSB applies to vehicles produced BEFORE the Production Change Effective VINs shown
PARTS INFORMATION:
REQUIRED SSTs:
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:
- Model: ES 350
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Engine Control
- Keyword: 2GR-FE 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.
NOTE
It is necessary to remove the intake manifold surge tank to access the engine wire harness.
HINT
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: Lexus
- Model: ES 350
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Fuel System
- Keyword: 2GR-FE Fuel: Fuel Injector: Removal
For intake air surge tank installation (2GR-FE only):
- Division: Lexus
- Model: ES 350
- Year: 2008
- Service Category: Engine/Hybrid System
- Section: Fuel System
- Keyword: 2GR-FE Fuel: Fuel Injector: 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.