Electrical - MIL ON/Multiple DTC's Set
T-SB-0344-08November 5, 2008
M.I.L. "ON" DTC P010#, P0121, P0125, P0172, P035#, P2237, or P2238
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
Introduction
Some 2007 - 2008 model year Yaris vehicles may exhibit a M.I.L. "ON" DTC condition with one of the following Diagnostic Trouble Codes (DTCs):
- P0101 - Mass Air Flow Circuit Range / Performance Problem
- P0102 - Mass Air Flow Circuit Low Input
- P0103 - Mass Air Flow Circuit High Input
- P0121 - Throttle / Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem
- P0125 - Insufficient Coolant Temperature for Closed Loop Fuel Control
- 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
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 shown above.
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:
- P0101 - P0125 - P0353
- P0102 - P0172 - P0354
- P0103 - P0351 - P2237
- P0121 - P0352 - P2238
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.
- P0101: 2007 / 2008 Yaris:
Engine/Hybrid System - Engine Control - "1NZ-FE Engine Control System:
SFI System: P0101: Mass Air Flow Circuit Range / Performance Problem"
- P0102/P0203: 2007 / 2008 Yaris:
Engine/Hybrid System - Engine Control - "1NZ-FE Engine Control System:
SFI System: P0100: Mass or Volume Air Flow Circuit"
- P0121: 2007 / 2008 Yaris:
Engine/Hybrid System - Engine Control - "1NZ-FE Engine Control System:
SFI System: P0121: Throttle / Pedal Position Sensor / Switch A Circuit Range / Performance Problem"
- P0125: 2007 / 2008 Yaris:
Engine/Hybrid System - Engine Control - "1NZ-FE Engine Control System:
SFI System: P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control"
- P0171/P0172: 2007 / 2008 Yaris:
Engine/Hybrid System - Engine Control - "1NZ-FE Engine Control System:
SFI System: P0171: System Too Lean (Bank 1)"
- P0351/P0352/P0353/P0354: 2007 / 2008 Yaris:
Engine/Hybrid System - Engine Control - "1NZ-FE Engine Control System:
SFI System: P0351: Ignition Coil "A" Primary / Secondary Circuit"
- P2238: 2007 Yaris:
Engine/Hybrid System - Engine Control - "1NZ-FE Engine Control System:
SFI System: P2238: Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)"
- P2237/P2238: 2008 Yaris:
Engine/Hybrid System - Engine Control - "1NZ-FE Engine Control System:
SFI System: P2237: Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)"
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.