LS 400 V8-4.0L (1UZ-FE) (1990)
Fuel Pressure: Testing and Inspection
Installing Jumper Wire
Functional Inspection
- Turn ignition on, do not start.
- Using a jumper wire, short check connector terminals FP and +B together.
Fuel Pressure Inspection
- Fuel pump pulsations should be able to be felt by grasping the fuel inlet hose.
- If no pressure is present, check the following
^
Fusible link
^
EFI main relay
^
Fuel pump
^
Fuel pump resistor
^
ECU
^
IGN and EFI fuses
^
Circuit opening relay
^
Wiring connections
EGR VSV
Fuel Pressure Inspection
- Turn ignition OFF.
- Disconnect negative battery terminal.
- Remove EGR VSV.