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.
1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Using Check Harness
- When checking voltage and resistance at ECM connector terminals, use Check Harness (SST 09990-01000, also called Check Harness "A") to prevent damaging terminals. See Fig 1.
- To connect check harness, disconnect ECM connectors. ECM is located underneath top of passenger-side carpet (behind glove box) and is mounted to floor panel. Connect the check harness between ECM and harness connectors.
- Connectors and terminals on check harness match those of ECM. Wire colors that are specified in procedures apply to ECM connectors, but may not apply to check harness connectors. To identify connectors and terminals, see appropriate illustration under CONNECTOR IDENTIFICATION .
Factory Service Tools
Use the Manual With the Right Hardware
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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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