Engine Controls - MIL ON/Multiple DTC's Set

T-SB-0379-08

November 26, 2008

M.I.L. "ON" DTC P0101, P0121, P0171, P0172, P035 #, P223 #

Service Category
Engine/Hybrid System

Section
Engine Control

Market
USA





Applicability

Introduction
Some 2009 model year Corolla and Matrix vehicles may exhibit a M.I.L. "ON" DTC condition with one or more of the following Diagnostic Trouble Codes (DTCs):

^ P0101 Mass Air Flow Circuit Range / Performance Problem

^ P0121 Throttle / Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem

^ P0171 System Too Lean

^ P0172 System Too Rich

^ P035 # Ignition Coil " # " Primary / Secondary Circuit

^ P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open

^ P2238 Oxygen (A/F) Sensor Pumping Current Circuit Low

^ P2239 Oxygen (A/F) Sensor Pumping Current Circuit High

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

Production Change Information





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





Warranty Information

APPLICABLE WARRANTY

^ This repair is covered under the Toyota Comprehensive Warranty. This warranty is in effect for 36 months or 36,000 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.





Parts Information





Required Tools & Equipment

NOTE
Additional TIS Techstream units may be ordered by calling Approved Dealer Equipment (ADE).

Repair Procedure

1. Using TIS Techstream, check for stored DTCs.





2. Verify one or more of the following DTCs is present:

NOTE
If other DTCs are present along with any of the DTCs listed above, this TSB does NOT apply. Follow Repair Manual procedures to diagnose other DTCs first.

3. Follow Repair Manual procedure to inspect the suspect circuit/component.








Refer to the Technical Information System (TIS), applicable model and model year Repair Manual:

4. If the DTC related circuits and components are within Repair Manual specifications, replace the engine wire harness.

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.