Control Relay

This multi-purpose relay switches power to vehicle sensors and actuators including airflow sensor, crank angle sensor, idle speed control, injectors and fuel pump, (not all sensors are used on all engines). When ignition switch is turned "ON" position, ECU energizes coils controlling injectors, airflow sensor and idle speed control. When ignition switch is turned to "START" position, ECU energizes coils (through inhibitor switch on automatic transmission) to supply power to fuel pump. Relay failure will cause a no-start condition. For additional testing see appropriate SYSTEM/COMPONENT TESTS article. Refer to the following list:

• Fuel Injected, see: I - SYSTEM/COMPONENT TESTS - EFI
• Carbureted, see: I - SYSTEM/COMPONENT TESTS - CARBURETED
  Fig 1: Typical Fuel Injected Engine Fuel Pressure Testing Connection

  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  FUEL PUMP TEST TERMINAL LOCATION
  
  

  Application	Wire Color	Location
  Galant	Yellow/Green	Left rear of engine compartment
  Starion	Black/White	Right front of engine compartment
  Van/Wagon	Red/Green	Left rear of battery compartment
  Montero	Black/White	Behind right kick panel
  Sigma	Black/Blue	Left rear engine compartment

  FUEL PRESSURE SPECIFICATIONS
  
  

  Application		psi (kg/cm2 )
  Regulator Hose On
  All Engines		38 (2.7)
  Starion		35-38 (2.5-2.7)
  Regulator Hose Off
  All Other Models		47-50 (3.3-3.5)
  Montero		47-53 (3.3-3.5)