INPUT/OUTPUT SIGNAL CHART

Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
Fuel pump control
FPCM

Fuel pump
Engine coolant temperature sensor
Engine coolant temperature
Mass air flow sensor
Amount of intake air
Battery
Battery voltage*
*: ECM determines the start signal status by the signals of engine speed and battery voltage.

 
 SYSTEM DESCRIPTION

The fuel pump control module (FPCM) controls the discharging volume of the fuel pump by the FPCM control signals (Low/Mid/Hi) depending on driving conditions.

Conditions
Amount of fuel flow
Supplied voltage
  • For 1 seconds after turning ignition switch
  • Engine is running under low load and low speed conditions
Low
Approximately 8.5 V
  • Engine cranking
  • Engine coolant temperature is below 10°C (50°F)
  • Engine is running under high load and high speed conditions
high
Battery voltage
(11 - 14 V)
Except the above
mid
Approximately 10 V