Inspection Procedure

NOTE

TSIB L-SB-0030-10, "MIL 'ON' DTC P030 # and/or intermittently Runs Rough" MUST be performed after the procedures in this bulletin to complete the overall repair.

1. Using TIS Techstream verify that one or more of the following DTCs are stored:

^ P0300 Random Misfire Detected

^ P0301 Cylinder 1 Misfire Detected

^ P0302 Cylinder 2 Misfire Detected

^ P0303 Cylinder 3 Misfire Detected

^ P0304 Cylinder 4 Misfire Detected

^ P0305 Cylinder 5 Misfire Detected

^ P0306 Cylinder 6 Misfire Detected

NOTE
If any other DTCs are present, refer to the Repair Manual for diagnostic information as this TSIB does NOT apply.

2. Perform misfire diagnosis.

Refer to the Technical Information System (TIS) 2006 model year GS 300 Repair Manual, Engine/Hybrid System - Engine Control - "3GR-FSE Engine Control System: SFI System: p0300: Random/Multiple Cylinder Misfire Detected"

NOTE
Normal mechanical engine condition, engine control system, fuel supply/injection systems, and ignition system operation must be present or this TSIB does NOT apply.

3. If the concern is not resolved after following the Repair Manual misfire diagnosis replace the valve springs and valve spring retainers using the Repair Procedures below.