CAUTION: Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tachometer to system. DO NOT allow tachometer terminal to become grounded or damage to ignitor and/or coil may exist.

Ensure engine is at normal operating temperature. Connect timing light to No. 6 spark plug wire. Connect tachometer to "IG-" terminal of engine check connector. Set tachometer to 4-cylinder range. See Fig 1.

Fig 1: Installing Tachometer
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Install jumper wire between terminals "TE1" and "E1"of engine check connector. See Fig 2. Ensure idle speed is within specification. See IDLE SPEED SPECIFICATIONS TABLE in this article. Note that base timing is within specification. See IGNITION TIMING (Degrees BTDC @ RPM) table in this article. Remove jumper wire from engine check connector.

Fig 2: Installing Timing Jumper Wire
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If ignition timing is not within specifications, check the following: Ensure throttle valve is fully closed. Ensure there is continuity between terminals "IDL" and "E2" of throttle position sensor. Check valve timing.

IGNITION TIMING

Application	Base Timing
LS400	8-12 @ 600-700

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

Use the Manual With the Right Hardware

When to See a Mechanic

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