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