LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1996 >> ES 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Pressure Regulator VSV Control Circuit
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel Pressure Regulator VSV Control Circuit

CAUTION: If ECM replacement is instructed, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair as necessary and repeat testing to confirm ECM malfunction.
  1. Check fuel pressure regulator VSV. See FUEL PRESSURE REGULATOR VACUUM SWITCHING VALVE (VSV) . Replace VSV as necessary. If VSV is okay, access ECM connectors behind glove box. Turn ignition on. Leave harness connectors attached to ECM. Backprobing connector, measure voltage between chassis ground and terminal No. 25 (Black/Red wire) at ECM E7 connector. See Figure.
  2. 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 article. If fuel pressure regulator is okay, replace ECM and retest.
scientia non olet · About LEMON Manuals