Toyota Supports ASE Certification Page 1 of 3

EG

008-04Title:

M.I.L. �ON" 1MZ-FE ENGINE MISFIREDTC P0300, P0301, P0302, P0303,P0304, P0305 OR P0306Models:

Applicable Avalon, Camry, Sienna & Solara

Technical ServiceBULLETIN

April 28, 2004

Some vehicles equipped with 1MZ–FE (V6) engines without VVTi may exhibit a roughidle and/or a M.I.L. “ON” condition with a diagnostic trouble code or codes for misfirecaused by an improperly operating ignition coil assembly. Production changes have beenimplemented to prevent this condition from occuring.

� 2001 model year Japan built Camry vehicles equipped with 1MZ–FE engines (V6).

� 1998–2001 model year North American built Camry vehicles equipped with 1MZ–FE engines (V6)

� 1998 – 1999 model year Avalon vehicles.

� 1998 – 2000 model year Sienna vehicles.

� 1999 – 2002 model year Solara vehicles equipped with 1MZ–FE engines producedBEFORE the Production Change Effective VIN shown below.

MODEL ENGINE PRODUCTION CHANGE EFFECTIVE VIN

Solara 1MZ–FE 2T1CF2#P*2C578710

OP CODE MODEL DESCRIPTION TIME OFP T1 T2

191011 Avalon R & R Ignition Coil (one coil) 0.2 90080–19012 02 73

191011CamrySolara R & R Ignition Coil (one coil) 0 3 90080 19012 02 73191011 SolaraSienna

R & R Ignition Coil (one coil) 0.3 90080–19012 02 73

Applicable Warranty*:This repair is covered under the Toyota Federal Emissions Warranty. This warranty isin effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle’sin-service date.For California specification vehicles registered and operated in California, Maine,Massachusetts or Vermont, this repair is covered under the California EmissionsWarranty, which is in effect for 36 months or 50,000 miles, whichever occurs first, fromthe vehicle’s in-service date.

* Warranty application is limited to correction of a problem based upon a customer’s specific complaint.

EN

GIN

E

Introduction

ApplicableVehicles

ProductionChange

Information

WarrantyInformation

M.I.L. “ON” 1MZ–FE ENGINE MISFIRE DTC P0300 – P0306 – EG008-04 April 28, 2004

Page 2 of 3

PREVIOUS PART NUMBER CURRENT PART NUMBER PART NAME QTY

90080–19012 Same Ignition Coil Assembly 1

SPECIAL SERVICE TOOLS (SSTs) PART NUMBER QUANTITY

Toyota Diagnostic Tester Kit*

01001271 1

12 Megabyte Diagnostic Tester Program Cardwith version 10.2a Software (or later)* 01002593-005 1

* Essential SSTs.

NOTE:Additional Diagnostic Tester Kits, Program Cards or other SSTs may be ordered bycalling SPX/OTC at 1-800-933-8335.

TOOLS & MATERIAL QUANTITY

Digital Volt Ohmmeter (DVOM) 1

1. Confirm if vehicle is currently misfiring, running rough or hesitating.

If YES – Go to Step 2.If NO – Review Freeze Frame Data and attempt to operate vehicle under similardriving conditions – see notes below for information that makes it more likely toduplicate misfire.

NOTE:The following activities will turn off misfire detection:� Changing engine RPM greater than 150 RPM.� Changing throttle position quickly.

Misfire duplication can be duplicated most readily when the engine speed and throttleangle are held nearly constant for at least 2 minutes.

AIGNITION 41CYL #1 0%CYL #2 0%CYL #3 0%CYL #4 Above 50%CYL #5 0%CYL #6 0%MISFIRE RPM 0rpmMISFIRE LOAD 0.00g/rev# CODES 1CHECK MODE OFFMISFIRE TEST COMPL

BIGNITION 205CYL #1 0%CYL #2 0%CYL #3 0%CYL #4 Above 50%CYL #5 0%CYL #6 0%MISFIRE RPM 0rpmMISFIRE LOAD 0.00g/rev# CODES 1CHECK MODE OFFMISFIRE TEST COMPL

NOTE:When misfire monitor is active, ignition value will change on Data List.When pending misfire DTC is set, “MISFIRE RPM” and “MISFIRE LOAD” will show values.

Values Will Change From Zero

PartsInformation

RequiredSSTs

RequiredTools &Material

RepairProcedure

M.I.L. “ON” 1MZ–FE ENGINE MISFIRE DTC P0300 – P0306 – EG008-04 April 28, 2004

Page 3 of 3

2. Confirm if misfire is currently occurring on cylinder(s) identified by DTC(s) using theDiagnostic Tester while engine is idling (see below).

FUNCTION SELECT FORNORTH AMERICA

BADIAGNOSTIC MENU

ENGINE

C

ALLUSER DATAEXTEND DATA

ATM02 SENSORFUEL SYSCATALYTICEVAP

ESELECT DATA

D

MISFIRE

1: OBD/MOBD

3: CARB OBD II4: BREAK–OUT BOX5: NVH6: AUTOPROBE7: 02 RPM CHECK8: SNAPSHOT REVIEW9: SETUP0: GAS ANALYSIS

2: ENHANCED OBD2: DTC INFO3: ACTIVE TEST4: SNAPSHOT5: SYSTEM CHECK6: RESET MEMORY7: MONITOR STATUS8: CHECK MODE

1: DATA LIST

Examining Data List For Misfire Percent

NOTICEENHANCED OBDII

COVERS VEHICLESTHROUGH 2004MY.EXCEPT SEQUOIA,TUNDRA, TACOMA.

FOR OTHER VEHICLESSELECT 2004 NEW

MODEL OR USE CARBOBDII

PRESS [ENTER]

IGNITION 41CYL #1 0%CYL #2 0%CYL #3 0%CYL #4 Above 50%CYL #5 0%CYL #6 0%MISFIRE RPM 0rpmMISFIRE LOAD 0.00g/rev# CODES 1CHECK MODE OFFMISFIRE TEST COMPL

Misfire on #4 Cylinder

Is the cylinder(s) identified by the DTC(s) misfiring?

If YES – Go to Step 3.If NO – Follow normal diagnostics for applicable DTC in Technical Information System(TIS) in applicable Repair Manual: Diagnostics: SFI: P030#.

3. Swap suspect ignition coil(s) from cylinder that is misfiring to cylinder that is not misfiring.

4. Using Diagnostic Tester, confirm that misfire is now occurring in cylinder that hassuspect ignition coil(s). Has misfire followed swapped ignition coil(s)?

If YES – Replace ignition coil(s) and go to Step 5.If NO – Follow normal diagnostics in Technical Information System (TIS) forapplicable Repair Manual: Diagnostics: SFI: P030#.

5. Confirm misfire has been eliminated (0% at all times) using Diagnostic Tester whileengine is idling.

NOTE:If misfire percent is any value other than 0% at any time, then that cylinder is misfiring.

RepairProcedure(Continued)