Mitsubishi Galant/Mirage/Diamante 1990-2000

Engine Control Unit/Powertrain Control Module (ECU/PCM)

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OPERATION



The Engine Control Unit/Powertrain Control Module (ECU/PCM) performs many functions on your vehicle. The module accepts information from various engine sensors and computes the required fuel flow rate necessary to maintain the correct amount of air/fuel ratio throughout the entire engine operational range.

Based on the information that is received and programmed into the PCM's memory, the PCM generates output signals to control relays, actuators and solenoids. The PCM also sends out a command to the fuel injectors that meters the appropriate quantity of fuel. The module automatically senses and compensates for any changes in altitude when driving your vehicle.

REMOVAL & INSTALLATION




WARNING
A grounded wrist strap should be used to prevent static discharge to the PCM. Static discharge can easily destroy the electronic components inside the PCM.

Mirage and 1999-00 Galant


Click image to see an enlarged view

Fig. PCM mounting location-Mirage


NOTE
The Powertrain Control Module (PCM) is located above the passenger side kickpanel.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the glove box, right side kickpanel and lower panel assemblies.
  4.  
  5. Unplug the connectors and remove fasteners. Remove the PCM.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

1994-98 Galant


Click image to see an enlarged view

Fig. PCM mounting location-1994-98 Galant

  1. Disconnect negative battery cable.
  2.  
  3. Remove both center console side panels.
  4.  
  5. Unplug the wiring connector and remove the mounting hardware. Slide the PCM out the side.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

Diamante and 1990-93 Galant


Click image to see an enlarged view

Fig. PCM mounting location-1990-93 Galant



Click image to see an enlarged view

Fig. PCM mounting location-Diamante


NOTE
The Powertrain Control Module (PCM) is located behind the glove box assembly.

  1. If equipped, disarm the air bag system.
  2.  
  3. Remove the passenger side lower instrument panel and shower duct.
  4.  
  5. Remove the glove box striker, glove box, glove box outer casing and the screw below the assembly.
  6.  
  7. Unplug wiring connector and remove mounting hardware. Slide out the PCM.
  8.  

To install:

  1. Install the PCM with the mounting hardware.
  2.  
  3. Attach the wire connector.
  4.  
  5. Install the glove box striker, the glove box, the glove box casing and the screw below the assembly.
  6.  
  7. Install the passenger side lower instrument panel and the shower duct.
  8.  
  9. Reconnect the negative battery cable.
  10.  

 
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