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.
1995 Lexus ES 300FACTORY OEM SERVICE PROCEDURE
Fuel Pressure Regulator VSV Control Circuit
- Check fuel pressure regulator VSV. See FUEL PRESSURE REGULATOR VACUUM SWITCHING VALVE (VSV) . If VSV is okay, remove glove box. Turn ignition on. Leave harness connectors attached to ECM. Measure voltage between chassis ground and terminal No. 25 (Black/Red wire) of ECM connector E7. To identify ECM connectors and terminals, see Figure.
- If battery voltage is not present, repair circuit between EFI main relay and ECM. If battery voltage is present, check fuel pressure regulator by performing FUEL PRESSURE test under FUEL SYSTEM in BASIC TESTING S article. If fuel pressure regulator is okay, replace ECM.
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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