Chrysler Concorde/Intrepid/LHS/New Yorker/Vision 1993-1997

Ignition Coil Pack

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TESTING



Spark Test

See Figure 1

Due to the high secondary voltage and risk of electrical shock, it is advisable to wrap a thick, dry cloth around the boot before grasping it.

Since there are 3 independent coils in the assembly, each coil must be checked individually.

  1. Remove the cable from the No. 2 spark plug, then insert a clean spark plug into the spark plug boot.
  2.  


CAUTION
The Direct Ignition System generates approximately 40,000 volts. Personal injury could result from contact with this system.

  1. Ground the plug to the engine (touch the spark plug metal body to the engine block or other piece of metal on the car).
  2.  


WARNING
Spark plug wire damage may occur if the spark plug is moved more than 1 / 4 in. (6mm) away from the engine ground.



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Fig. Fig. 1: Using a spark plug cable boot, ground the plug to the engine

  1. Crank the engine and look for spark across the electrodes of the spark plug.
  2.  
  3. Repeat the test for the five remaining cylinders. If there is no spark during all cylinder tests, Refer to Driveability & Emissions Controls to test the Crankshaft and Camshaft position sensors. If one or more tests indicate irregular, weak or no spark, refer to the coil test.
  4.  

Coil Test

See Figures 2, 3 and 4



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Fig. Fig. 2: The ignition coil connection terminal descriptions



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Fig. Fig. 3: Check the primary resistance at the electrical connection and the secondary resistance across the coil towers



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Fig. Fig. 4: Ignition coil terminal identification

Coil one fires cylinders 1 and 4, coil two fires cylinders 2 and 5, coil three fires cylinders 3 and 6 for the 3.3L and 3.5L engines. Each coil tower is labeled with the number of the corresponding cylinder.

  1. Unplug the ignition cables from the coil terminals and the spark plugs. Make certain to label them before removal. Measure the resistance of the cables. Resistance must be between 3,000-12,000 ohms per ft. (30.5 cm) of cable. Replace any cable not within tolerance.
  2.  
  3. Unplug the electrical wiring harness connector from the coil pack.
  4.  

  1. Measure the primary resistance of each coil. At the coil, connect an ohmmeter between the B+ pin and the pin corresponding to the cylinders in question. Resistance on the primary side of each coil should be 0.45-0.65 ohms at 21-27°C (70-80°F). A coil not allowed to cool down, could result in inaccurate measurement results. Replace the coil with a new one if the resistance is not within tolerance.
  2.  

  1. Remove the ignition cables from the secondary towers of the coil. Measure the secondary resistance of the coil between the towers of each individual coil. Resistance for these engines depends on which manufacturer made the coil being tested. If the coil was manufactured by Diamond, the resistance should be 7000-15,800 ohms; if the coil was made by Toyodenso, the resistance should be 7000-15,800 ohms. If the coils' resistance are not within specifications, the coil must be replaced.
  2.  

REMOVAL & INSTALLATION



3.3L Engine

See Figures 5, 6, 7 and 8

The coil pack attaches to a bracket mounted on the left cylinder head.

  1. Disconnect the negative - battery cable.
  2.  



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Fig. Fig. 5: Unplug and tag the coil wires at the coil pack

  1. Unplug and label the spark plug cables from the coil pack.
  2.  
  3. Detach the electrical wiring harness connector from the coil pack.
  4.  



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Fig. Fig. 6: Detach the electrical wiring harness connector from the coil pack



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Fig. Fig. 7: Remove the coil mounting screws

  1. Loosen and remove the coil mounting screws.
  2.  
  3. Remove the ignition coil from the engine.
  4.  



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Fig. Fig. 8: Slide the coil pack under the bracket to remove

To install:
  1. Set the ignition coil back in place and secure with the mounting screws. The mounting screws should be tightened to 9 ft. lbs. (12 Nm).
  2.  
  3. Plug the electrical wiring harness connector back into the coil pack.
  4.  
  5. Attach the spark plug cables to the ignition pack. making certain the cables are attached to the correct coil towers.
  6.  
  7. Connect the negative battery cable.
  8.  

3.5L Engine

The ignition coil pack attaches to the right cylinder head.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air cleaner hose.
  4.  
  5. Disconnect the electrical wiring from the coil pack.
  6.  
  7. Remove the coil pack mounting screws.
  8.  
  9. Remove the coil.
  10.  

To install:
  1. The spark plug wires are numbered by the manufacturer for cylinder identification, if they are dirty, clean and/or tag them.
  2.  
  3. Transfer the plug cables to the new coil pack one at a time. The coil pack is numbered with each cylinder for identification.
  4.  
  5. Set the ignition coil back in place and secure with the mounting screws. The mounting screws should be tightened to 9 ft. lbs. (12 Nm).
  6.  
  7. Connect the negative battery cable.
  8.  

 
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