Sienna AWD V6-3.3L (3MZ-FE) (2004)
Oxygen Sensor: Customer Interest
Engine Controls - MIL ON/AF Sensor DTC's Set
ENGINE
EG001-05
Title:
M.I.L. "ON" DTC P0031, P0051, P2238, AND/OR P2241
Models:
'04 Sienna
February 2, 2005
Introduction
Under certain driving conditions, some 2004 model year Sienna vehicles may exhibit a M.I.L. "ON" with at least one of the following DTCs:
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P0031 (Oxygen Sensor Heater Control Circuit Low [Bank 1, Sensor 1])
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P0051 (Oxygen Sensor Heater Control Circuit Low [Bank 2, Sensor 1])
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P2238 (Oxygen Sensor Pumping Current Circuit Low (for A/F Sensor) [Bank 1, Sensor 1])
^
P2241 (Oxygen Sensor Pumping Current Circuit Low (for A/F Sensor) [Bank 2, Sensor 1])
The A/F sensor manufacturing process and the Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic have been modified
to improve these conditions.
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A 2005 model year Brake Actuator Assembly must be installed on vehicles equipped with laser cruise control due to the use of 2005 model year
software in the new ECM/PCM calibration
NOTE:
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Version 12.01aa or later Diagnostic Tester software is required to perform this procedure.
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Before proceeding, verify the ECM (PCM) calibration has NOT been updated by checking for the Authorized Modifications Label (shown in
step 1 of the Repair Procedure).
Applicable Vehicles
2004 model year Sienna vehicles.
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first,
from the vehicle's in-service date.
* Warranty application is limited to correction of a problem based upon a customer's specific complaint.