GS300 & Is300
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Lexus SC 430, 2003 Lexus RX 300, 2003 Lexus LX 470, 2003 Lexus LS 430, and 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Start and warm engine up to normal operating temperature. Shut engine off. Connect scan tool to DLC3. See Fig 1. Use scan tool to read engine RPM. Using a timing light that can detect primary ignition signal, connect inductive lead to appropriate wire at ignitor. See Fig 2. Ignitor is located on top of driver's side strut tower.
- Apply parking brake. Place transmission in Neutral. Start engine and maintain engine at 2500 RPM for 90 seconds and allow engine to idle. Ensure idle speed is 650-750 RPM. On GS300, install Jumper Wire (SST 09843-18020) between terminals TC and E1 on DLC1 located near driver's side strut tower. See Fig 3. On IS300, install Jumper Wire (SST 09843-18020) between terminals TC and CG on DLC3 located under right side of instrument panel. See Fig 4.
- On all models, timing marks are located on timing belt cover, near crankshaft pulley. Ensure base timing is 8-12 degrees BTDC at idle with transmission in Neutral, and with A/C and all accessories off. Remove jumper wire from DLC1. Ensure ECM controlled timing is 6-16 degrees BTDC. Shut engine off. Remove timing light and scan tool.