Mazda Car 2002-04

Powertrain Control Module (PCM)

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Operation



The PCM/ECM performs many functions on your car. 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.

The PCM/ECM performs many functions on your car. 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.

The PCM/ECM performs many functions on your car. 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.

The PCM/ECM performs many functions on your car. 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.

The PCM/ECM performs many functions on your car. 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.

The PCM/ECM performs many functions on your car. 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



  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rear console.
  4.  
  5. Unplug the wiring harness connector from the control module.
  6.  
  7. Loosen the mounting fasteners and remove the PCM from the vehicle.
  8.  
  9. Installation is the reverse of the removal procedure. Tighten mounting fasteners to 70-95 in lbs.
  10.  

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the battery cover.
  4.  
  5. Remove the battery duct.
  6.  
  7. Remove the battery and battery tray with the PCM.
  8.  
  9. Remove the PCM harness connectors.
  10.  
  11. Remove the PCM from the battery tray.
  12.  
  13. Installation is the reverse of the removal procedure.
  14.  

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the PCM cover.
  4.  
  5. Remove the PCM harness connectors.
  6.  
  7. Remove the mounting fasteners and remove the PCM from the vehicle.
  8.  
  9. Installation is the reverse of the removal procedure. Tighten mounting fasteners to 70-95 in lbs.
  10.  

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rear console box, center panel and under cover.
  4.  
  5. If applicable, detach the rear heater ducts behind the side covers to gain access to the ECU electrical connectors.
  6.  
  7. Unplug the wiring harness connector from the control module.
  8.  
  9. Loosen the mounting fasteners and remove the PCM from the vehicle.
  10.  
  11. Installation is the reverse of the removal procedure. Tighten mounting fasteners to 70-95 in lbs.
  12.  

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the front passenger side scuff plate.
  4.  
  5. Remove the front passenger side trim
  6.  
  7. Partially peel off the floor covering from the front of the passenger-s side.
  8.  
  9. Remove the PCM mounting plate
    CAUTION
    The PCM plate edges are sharp. Care should be taken when handling the plate.

  10.  
  11. Unplug the wiring harness connector from the control module.
  12.  
  13. Loosen the mounting fasteners and remove the PCM from the vehicle.
  14.  
  15. Installation is the reverse of the removal procedure. Tighten mounting fasteners to 70-95 in lbs.
  16.  

 
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