Ram 1500, 2500, 3500, 2WD and 4WD, 2001-2005

Engine Control Module

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Description & Operation



The Engine Control Module (ECM) 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.


NOTE
This component may also be referred to as the Powertrain Control Module (PCM).

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

Click image to see an enlarged view

Fig.

The Engine Control Module (ECM) 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.


NOTE
This component may also be referred to as the Powertrain Control Module (PCM).

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

Click image to see an enlarged view

Fig.

Removal & Installation




WARNING
The negative battery cable MUST BE DISCONNECTED prior to servicing the ECM. Voltage spikes could damage the ECM while handling it.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the retaining tabs on the cover over the ECM and remove the ECM cover.
  4.  
  5. Remove the ECM wiring harness connector(s).
  6.  
  7. Remove the ECM retaining bolts and remove the ECM.
  8.  

To Install:

  1. Install the ECM and tighten mounting bolts to 35 inch lbs. (4 Nm).
  2.  
  3. Inspect the ECM pins and the terminals on the harness connector(s) for damage and corrosion before installing. Install wiring harness connector(s) onto ECM.
  4.  
  5. Install the ECM cover.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. The scan tool must be used to program the new processor with the vehicles VIN number and original mileage. If this step is not done, a DTC can be set.

    Click image to see an enlarged view

    Fig.



    Click image to see an enlarged view

    Fig.

  10.  


WARNING
The negative battery cable MUST BE DISCONNECTED prior to servicing the ECM. Voltage spikes could damage the ECM while handling it.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the retaining tabs on the cover over the ECM and remove the ECM cover.
  4.  
  5. Remove the ECM wiring harness connector(s).
  6.  
  7. Remove the ECM retaining bolts and remove the ECM.
  8.  

To Install:

  1. Install the ECM and tighten mounting bolts to 35 inch lbs. (4 Nm).
  2.  
  3. Inspect the ECM pins and the terminals on the harness connector(s) for damage and corrosion before installing. Install wiring harness connector(s) onto ECM.
  4.  
  5. Install the ECM cover.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. The scan tool must be used to program the new processor with the vehicles VIN number and original mileage. If this step is not done, a DTC can be set.

    Click image to see an enlarged view

    Fig.



    Click image to see an enlarged view

    Fig.

  10.  

 
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