Engine - MIL ON/DTC's P0171/P0300/P0133
ENGINEEG047-07
Title:
M.I.L. "ON" DTC P0171, P030 #, AND/OR
P0133 ENGINE RUNNING LEAN IN
SUBFREEZING AMBIENT
TEMPERATURES
Models:
'00 - '05 MR2 Spyder (1ZZ-FE)
October 27, 2007
Introduction
Following a cold soak in subfreezing ambient temperatures, some 2000 - 2005 model year MR2 Spyder vehicles equipped with a 1ZZ-FE engine may exhibit a M.I.L. "ON" with one or more of the following Diagnostic Trouble Codes (DTCs) as the result of a vacuum leak at the intake manifold.
^ P0171 - System Too Lean (Bank 1)
^ P0300 - Random Multiple Cylinder Misfire Detected
^ P030 # - Cylinder (1-4) Misfire Detected
^ P0133 - Oxygen Sensor Slow Response (Bank 1 Sensor 1) Please use the following procedure to repair the vehicle.
Applicable Vehicles
^ 2000 - 2005 model year MR2 Spyder vehicles equipped with the 1ZZ-FE engine.
Parts Information
Warranty Information
Applicable Warranty*:
^ This repair is covered under the Toyota Federal Emission Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle's in-service date.**
^ For California specification 2000 model year vehicles sold, registered, and operated in California, Massachusetts, and Vermont, this repair is covered under the California Emission Warranty, which is in effect 36 months or 50,000 miles, whichever occurs first, from the vehicle's in-service date.
^ For California specification 2001 - 2005 model year vehicles sold, registered, and operated in California, Maine (starting with 2004 model year), Massachusetts, and Vermont, this repair is covered under the California Emission Warranty, which is in effect 84 months or 70,000 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.
** Due to a misprint in the Owner's Warranty Information booklets, the Warranty Department will honor claims under the 60 months or 60,000 mile Powertrain Warranty for 2000 - 2004 model year vehicles.
Required Tools & Equipment
Inspection Procedure
NOTE:
The vehicle MUST be diagnosed following a cold soak. If the vehicle is at operating temperature, the condition will NOT be present.
1. Monitor the following Data List parameter: Short FT # 1 (Short Term Fuel Trim for Bank 1).
Using TIS techstream, select:
Connect to Vehicle/Engine and ECT/Data List/Short FT # 1.
2. Following conventional diagnostic procedure, confirm if there is a leak where the intake manifold and cylinder head meet between each intake runner.
3. Did the short term fuel trim change to a rich reading (negative fuel trim) in step 2?
^ If YES - Replace the intake manifold gasket.
^ If NO - Check for other vacuum leaks or lean running conditions per the Technical Information System (TIS).
Repair Procedure
1. Remove the engine unit. Refer to TIS:
^ 2000, 2001, or 2002 model year MR2 Spyder Repair Manual, Engine/Hybrid System - Engine Mechanical - "1ZZ-FE: Engine Unit: Removal"
^ 2003, 2004, or 2005 model year MR2 Spyder Repair Manual, Engine/Hybrid System - Engine Mechanical - "Engine Unit: Removal"
2. Remove the intake manifold and throttle body assembly.
A. Disconnect the 2 water hoses from the throttle body.
B. Disconnect the 2 vacuum hoses from the intake manifold.
C. Remove the 4 bolts, 2 nuts, 2 wire brackets, the intake manifold, and the throttle body assembly.
3. Clean the mounting surface of the intake manifold.
4. Install the intake manifold.
A. Install a NEW gasket to the intake manifold.
B. Install the intake manifold and throttle body assembly with the 2 brackets, 4 bolts, and 2 nuts. Uniformly tighten the bolts and nuts in several passes.
Torque: 30 N.m (306 kgf.cm, 22 ft.lbf)
C. Connect the 2 vacuum hoses to the intake manifold.
D. Connect the 2 water hoses to the throttle body.
5. Reinstall the engine unit. Refer to TIS:
^ 2000, 2001, or 2002 model year MR2 Spyder Repair Manual, Engine/Hybrid System - Engine Mechanical - "1ZZ-FE: Engine Unit: Installation"
^ 2003, 2004, or 2005 model year MR2 Spyder Repair Manual, Engine/Hybrid System - Engine Mechanical - "Engine Unit: Installation"
6. Clear the fuel trim values by disconnecting the negative (-) battery cable for 90 seconds.
7. Test drive the vehicle and confirm normal operation.