Start engine and warm engine to normal operating temperature. Shut engine off. Remove intake manifold cover located on top of engine, above intake manifold.
Connect scan tool to data link connector No. 3. See Figure. Scan tool is used to read engine RPM.
Connect timing light lead to wire at ignition coil electrical connector on top of driver's side valve cover at cylinder No. 1. See Fig 1. Cylinder No. 1 is front cylinder on left side of engine when viewed from flywheel end of engine. See Figure.
Apply parking brake. Place transmission in Neutral. Start engine and maintain engine at 2500 RPM for 90 seconds and then allow engine to idle. Ensure idle speed is 650-750 RPM.
Install Jumper Wire (SST 09843-18020) between terminals TC and E1 on data link connector No. 1. See Fig 2. Data link connector No. 1 is located on passenger's side front fender, behind air cleaner.
Timing marks are located on timing belt cover, near crankshaft pulley. Ensure base ignition timing is 5-15 degrees BTDC at idle with transmission in Neutral. Shut engine off. Remove jumper wire, timing light and scan tool. Reinstall intake manifold cover.

Fig 1: Connecting Timing Light At Ignition Coil (LX470)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Ignition Timing: Lx470