Canada - Ignition System - MIL ON/DTC's P0300 to P0306

Bulletin
TSB2048

Issue Date
December 03, 2004

Title
M.I.L. "ON" 1MZ-FE ENGINE MISFIRE DTC P0300 TO P0306

Component
ENGINE ELECTRICAL

Models
'98 - '00 Sienna

MARKET
Canada

Some vehicles equipped with 1MZ--FE (V6) engines without VVTi may exhibits rough idle and/or a M.I.L. "ON" condition with a diagnostic trouble code or codes for misfire caused by an improperly operating ignition coil assembly. Production changes have been implemented to prevent this condition from occurring.

APPLICABLE VEHICLES:
- 1998 -- 2000 model year Sienna vehicles





WARRANTY INFORMATION:





PARTS INFORMATION:





REQUIRED SSTS:





REQUIRED TOOLS AND MATERIALS:

REPAIR PROCEDURE:

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 similar driving conditions - see notes below for information that makes it more likely to duplicate misfire.





NOTE:
The following activates 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 throttle angle are held nearly constant for at least 2 minutes.





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

Is the cylinder(s) identified by the DTC(s) misfiring?
If YES -- Go to Step 3
If NO -- Follow normal diagnostics for applicable DTC on E-TAS 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. Confirm using Diagnostic Tester that misfire is now occurring in cylinder that has suspect 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 on ETAS for applicable Repair Manual: Diagnostics: SFI:P030#

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

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

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.