Fuel Pressure Regulator VSV Control Circuit
WARNING: This page is about a different car, the 1995 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Check fuel pressure regulator VSV. See FUEL PRESSURE REGULATOR VACUUM SWITCHING VALVE (VSV) . If VSV is okay, pull back the right front floor mat. Remove ECM protective cover. Connect a Check Harness (09990-01000) between ECM and harness. See USING CHECK HARNESS under INTRODUCTION. Turn ignition on.
- Measure voltage between chassis ground and terminal No. 36 (Green/Red wire) of ECM connector "B". If battery voltage is present, VSV circuit is okay. If battery voltage is not present, check circuit between ECM and VSV, and between VSV and EFI main relay. If circuit is okay, replace ECM.