FUEL PUMP - System Description / Component Description
EF & EC-7236prose procedureSystem Description
Camshaft position sensor (PHASE)
Input Signal to ECMEngine speed
ECM functionECM
ActuatorFuel pump relay
Ignition switch
Input Signal to ECMStart signal
ECM functionECM
ActuatorFuel pump relay
The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine startability. If the ECM receives a 180° signal from the camshaft position sensor, it knows that the engine is rotating, and causes the pump to perform. If the 180° signal is not received when the ignition switch is on, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.
Ignition switch is turned to ON.
Fuel pump operationStops
Engine running and cranking
Fuel pump operationOperates
When engine is stopped (Signal is not sent from camshaft position sensor.)
Fuel pump operationStops
Except as shown above
Fuel pump operationStops
Component Description
A turbine type design fuel pump is used in the fuel tank.
CONSULT-II Reference Value in Data Monitor Mode
FUEL PUMP RLY
CONDITIONEngine running and cranking
SPECIFICATIONON
FUEL PUMP RLY
CONDITIONExcept as shown above
SPECIFICATIONOFF
ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and ECM ground.
1
WIRE COLORB/Y
ITEMFuel pump relay
CONDITION[Ignition switch "ON"] Cranking and running engine
DATA (DC Voltage)0 - 1V
1
WIRE COLORB/Y
ITEMFuel pump relay
CONDITION[Ignition switch "ON"] exept above.
DATA (DC Voltage)BATTERY VOLTAGE (11 - 14V)