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 occur.

Ensure engine is at normal operating temperature. Connect timing light to No. 1 plug wire. Connect tachometer to IG- terminal of engine check connector. See Fig 1.
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 under IDLE SPEED & MIXTURE. Ensure base timing is within specification. See IGNITION TIMING table. Adjust timing by turning distributor.
Remove jumper wire from engine check connector and check that advance timing is within specification. See IGNITION TIMING table.

IGNITION TIMING

Application	Timing Advance
ES300	10 @ 650-750
LS400	8-12 @ 600-700
SC300	8-12 @ 600-700
SC400	8-12 @ 600-700

Fig 1: Installing Tachometer (ES300)

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: Es300

Use the Manual With the Right Hardware

When to See a Mechanic

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