Chrysler RAM50/D50/Arrow 1979-1993 Repair Guide

Ignition Coil

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TESTING



2.0L and 2.6L Engines

See Figures 1, 2 and 3

  1. Measure the resistance of the external resistor on the coil by connecting the probes of an ohmmeter across the two resistor connectors. Resistance should be as follows or the unit should be replaced.

    2.0L engine (1983-86): 1.35 ohms
     
    2.0L engine (1987-89): 1.2-1.4 ohms
     
    2.6L engine (1983-86): 1.04-1.27 ohms
     
    2.0L engine (1987-88): 1.25 ohms
     
    2.6L engine (1989-90): 1.12-1.38 ohms
     

  2.  
  3. Measure the resistance across the coil primary circuit by connecting an ohmmeter between the (+) and (-) coil connectors. Resistance must be approximately as follows or the coil should be replaced.

    2.0L engine (1979-82): 0.7-0.85 ohms
     
    2.0L engine (1983-86): 1.2 ohms
     
    2.0L engine (1987-89): 1.08-1.32 ohms
     
    2.6L engine (1979-82): 0.7-0.85 ohms
     
    2.6L engine (1983-86): 1.04-1.27 ohms
     
    2.6L engine (1987-88): 1.25 ohms
     
    2.6L engine (1989-90): 1.12-1.38 ohms
     

  4.  
  5. Set your ohmmeter to the x1000 scale and measure the resistance between the connector inside the coil tower and the coil (+) terminal. This is secondary resistance and must be as follows, or the unit should be replaced.

    2.0L engine (1979-82): 9-11 kilohms
     
    2.0L engine (1983-86): 1.2 kilohms
     
    2.0L engine (1987-89): 1.08-1.32 kilohms
     
    2.6L engine (1979-82): 9-11 kilohms
     
    2.6L engine (1983-86): 7.1-9.6 kilohms
     
    2.6L engine (1987-88): 11.0 kilohms
     
    2.6L engine (1989-90): 9.4-12.7 kilohms
     

  6.  
  7. Inspect the unit for oil leaks and cracks in the coil tower, and replace it if any defects are noted.
  8.  



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Fig. Fig. 1: Checking the resistance of the external resistor



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Fig. Fig. 2: Checking primary coil resistance



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Fig. Fig. 3: Checking secondary coil resistance

2.4L and 3.0L Engines See Figure 4

  1. Measure the resistance across the coil primary circuit by connecting an ohmmeter between the (+) and (-) coil connectors. Resistance must be approximately 0.72-0.88 ohms or the coil should be replaced.
  2.  
  3. Set your ohmmeter to the x1000 scale and measure the resistance between the connector inside the coil tower and the coil (+) terminal. This is secondary resistance and must be 10.3-13.9 kilohms, or the unit should be replaced.
  4.  
  5. Inspect the unit for cracks in the coil tower, and replace it if any defects are noted.
  6.  



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Fig. Fig. 4: Coil assembly for the 2.4L and 3.0L engines

REMOVAL & INSTALLATION



See Figures 5 through 9

  1. Disconnect the negative battery cable.
  2.  
  3. Remove any components necessary to access the coil.
  4.  
  5. Tag and disconnect all electrical leads.
  6.  
  7. Remove any mounting bolts then the ignition coil.
  8.  



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Fig. Fig. 5: Ignition system and coil location-2.4L engines



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Fig. Fig. 6: Ignition system and coil location-3.0L engines



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Fig. Fig. 7: Label all electrical wiring leading to the ignition coil



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Fig. Fig. 8: Location of high tension cables attached to the ignition coil to be disconnected



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Fig. Fig. 9: Once labeled, remove the wiring attached to the ignition coil

To install:
  1. Install the coil assembly in position and tighten the mounting bolts.
  2.  
  3. Connect all wires to the coil assembly.
  4.  
  5. Install any components removed during disassembly.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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