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.
1993 Lexus SC 300 AutomaticFACTORY OEM SERVICE PROCEDURE
Malfunction Indicator Light (Mil) Does Not Flash
- Turn ignition on. Measure voltage between terminal E1 and terminals TE1 and TE2 of Data Link Connectors (DLCs) No. 1 and 2. See Figure. If voltage is 9-14 volts, replace Engine Control Module (ECM). If voltage is not 9-14 volts, go to next step.
- Check continuity between ground and terminal E1 of DLCs No. 1 and 2. If continuity does not exist, repair open in wiring harness. If continuity exists, go to next step.
- Check for an open or short in wiring harness between ECM and DLCs No. 1 and 2. Repair or replace wiring harness as necessary. If wiring harness is okay, check and replace ECM as necessary. See CONTROL UNIT under COMPUTERIZED ENGINE CONTROLS in I - SYS/COMP TESTS article.
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.
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