ELECTRIC FUEL PUMP CONTROL SYSTEM (4WD models) - Operation / Schematic
EF & EC-178wiring diagramElectric fuel pump control system applies to 4WD models (GA13DS/GA14DS/GA16DS). Wire colors not labeled on the schematic (see wiring diagram on EF & EC-179 for colors).
Operation
Operation
OFF
EngineStopped
AlternatorNot generating
Oil pressureNo pressure
Fuel pumpNot operating
ACC
EngineStopped
AlternatorNot generating
Oil pressureNo pressure
Fuel pumpNot operating
ON
EngineStopped
AlternatorNot generating
Oil pressureNo pressure
Fuel pumpNot operating
START
EngineCranking
AlternatorGenerating
Oil pressureLow pressure
Fuel pumpOperating
START
EngineCranking
AlternatorNot generating
Oil pressureLow pressure
Fuel pumpOperating
ON
EngineRunning
AlternatorGenerating
Oil pressureNormal
Fuel pumpOperating
ON
EngineRunning
AlternatorFailure
Oil pressureNormal
Fuel pumpOperating
ON
EngineRunning
AlternatorGenerating
Oil pressureFailure
Fuel pumpOperating
Schematic
Fuel Pump Control System Schematic
Components (11)
Fuel pump control unitIgnition switch ON or STARTIgnition switch ACC or ONFuse (ON or START)Fuse (ACC or ON)Alternator (L terminal)Oil pressure switchFuel pump (motor)"CHARGE" warning lamp"OIL" warning lampGROUND
Connections (10)
Ignition switch ON or START
Ignition switch ON or STARTFuse (ON or START)??
Fuse (ON or START)
Fuse (ON or START)Fuel pump control unit:2??
Ignition switch ACC or ON
Ignition switch ACC or ONFuse (ACC or ON)??
Fuse (ACC or ON)
Fuse (ACC or ON)Fuel pump control unit:1??
Fuel pump control unit
Fuel pump control unit:4"CHARGE" warning lamp??
Fuel pump control unit:3"OIL" warning lamp??
Fuel pump control unit:5GROUND??
Fuel pump control unit:6Fuel pump (motor)??
Alternator (L terminal)
Alternator (L terminal):LFuel pump control unit:4??
Oil pressure switch
Oil pressure switchFuel pump control unit:3??