Chrysler Neon 1995-1999 Repair Guide

Powertrain Control Module (PCM)

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OPERATION



See Figures 1, 2, 3 and 4

The heart of the electronic control system, which is found on the vehicles covered by this guide, is a Powertrain Control Module (PCM). The module gathers information from various sensors, then controls fuel supply and engine emission systems. The PCM controls the engine and related emissions systems. It may also control the manual transaxle shift lamp or the shift functions of the electronically controlled automatic transmission.

Care must be taken when handling these expensive components in order to protect them from damage. Carefully follow all instructions included with the replacement part. Avoid touching pins or connectors to prevent damage from static electricity.



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Fig. Fig. 1: The PCM is attached to the inner fender panel, next to the windshield washer bottle-1995 vehicle shown


WARNING
To prevent the possibility of permanent control module damage, the ignition switch MUST always be OFF when disconnecting power from or reconnecting power to the module. This includes unplugging the module connector, disconnecting the negative battery cable, removing the module fuse or even attempting to jump your dead battery using jumper cables.

In the event of an PCM failure, the system will default to a pre-programmed set of values. These are compromise values which allow the engine to operate, although at a reduced efficiency. This is variously known as the default, limp-in or back-up mode. Driveability is almost always affected when the PCM enters this mode.



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Fig. Fig. 2: Powertrain Control Module (PCM) 60-way connector identification-1995 vehicles



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Fig. Fig. 3: PCM 40-pin terminal identification (1 of 2)-1996-99 vehicles



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Fig. Fig. 4: PCM 40-pin terminal identification (2 of 2)-1996-99 vehicles

REMOVAL & INSTALLATION



1995 Vehicles

See Figure 5

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the attaching the PCM to the body.
  4.  
  5. Lift the PCM partially up, then detach the 60-way connector from the PCM.
  6.  
  7. Remove the PCM from the vehicle.
  8.  



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Fig. Fig. 5: The PCM on 695 vehicles is retained with 2 mounting screws

To install:
  1. Attach the 60-way connector to the PCM. Tighten the connector screw to 40 inch lbs. (4.7 Nm).
  2.  
  3. Position the PCM in the vehicle, then install the mounting screws and tighten to 80 inch lbs. (9 Nm).
  4.  
  5. Connect the negative battery cable.
  6.  

1996-99 Vehicles

See Figure 6

  1. Disconnect the negative then the positive battery cables.
  2.  
  3. Remove the windshield washer bottle neck.
  4.  
  5. Squeeze the tabs on the power distribution center while pulling the center up to remove it from the bracket. Position the power distribution center aside for access to the PCM bracket screws.
  6.  
  7. Unfasten the PCM-to-body screws.
  8.  
  9. Lift the PCM partially up and detach the two 40-way electrical connectors.
  10.  
  11. Remove the PCM from the vehicle.
  12.  



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Fig. Fig. 6: Location of the PCM mounting-1996-99 vehicles

To install:
  1. Attach the two 40-way electrical connectors to the PCM.
  2.  
  3. Install the PCM, tightening the retaining screws to 80 inch lbs. (9 Nm).
  4.  
  5. Install the power distributor center by pushing it down into the brackets.
  6.  
  7. Install the washer bottle neck.
  8.  
  9. Connect the positive, then the negative battery cables.
  10.  

 
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