Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1994 Lexus ES 300FACTORY OEM SERVICE PROCEDURE
Tachometer Does Not Operate
- If fuel gauge and speedometer operate, go to next step. If fuel gauge and speedometer do not operate, check for open circuit between ground and terminal No. 10 of instrument cluster connector "B". See Figure and Figure . If circuit is okay, replace instrument cluster computer. See Figure.
- Disconnect instrument cluster connector "B". See Figure. Start engine. Using a DVOM that can measure Hz, check voltage between ground and terminal No. 9 of connector "B". See Figure. If voltage does not fluctuate, repair circuit between terminal No. 9 and ignitor.
- If voltage fluctuates, replace character plate. See Figure. If problem is still present, replace instrument cluster computer.
Factory Service Tools
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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.