Mitsubishi Pick-ups and Montero 1983-1995 Repair Guide

Electronic Control Unit (ECU)

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TESTING



To test the ECU, a special Mitsubishi scan tool and oscilloscope would be needed. Therefore, if the ABS warning light comes on or a problem with the ABS is evident, have the system diagnosed by an automotive mechanic familiar with the Mitsubishi ABS systems. After the vehicle has been diagnosed and the cause is known, the defective part can be replaced at home.

REMOVAL & INSTALLATION



See Figure 1

  1. Disconnect the negative battery cable from the battery.
  2.  
  3. For Monteros with an optional third seat, remove the third seat.
  4.  
  5. Remove the right-hand, rear, lower quarter trim to gain access to the ECU.
  6.  
  7. Remove the large bracket by removing the four mounting screws.
  8.  
  9. Remove the two mounting screws for the smaller bracket. Remove the ECU and small bracket from the large bracket.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Electronic control unit is located under the right rear quarter panel, mounted to the fender-1992-95 Monteros

  1. Unplug the wiring harness connector from the ECU. Remove the two ECU mounting bolts from the small bracket.
  2.  
  3. To install, mount the ECU to the small bracket with the two mounting screws.
  4.  
  5. Plug the wiring harness connector back into the ECU.
  6.  
  7. Affix the small bracket to the large bracket with the two mounting bolts. Mount the entire bracket/ECU assembly to the inner fender with the four mounting bolts.
  8.  
  9. Install the lower quarter trim. Install the third seat, if removed.
  10.  
  11. Connect the negative cable to the battery.
  12.  

 
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