Nissan 240SX/Altima 1993-1998 Repair Guide

Ignition Coil

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TESTING



See Figures 1, 2 and 3



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Fig. Fig. 1: Testing the ignition coil primary resistance. Note that the reading on the ohmmeter is within specification



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Fig. Fig. 2: Testing the ignition coil secondary resistance. Note that the reading on the ohmmeter is within specification



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Fig. Fig. 3: On some vehicles, the ignition coil connector is located at the distributor

Prior to testing the coil, perform a secondary spark test. If spark occurs at the spark plug, the coil is functioning properly.

  1. Turn the ignition OFF .
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Perform a visual inspection of the coil. If the coil is cracked, damaged or oil is leaking from the coil, the coil is faulty.
  6.  
  7. Label and disconnect the electrical harness from the ignition coil.
  8.  
  9. Inspect the harness connector and ignition coil terminals for dirt, corrosion or damage. Repair as necessary.
  10.  
  11. Using an ohmmeter, measure coil primary resistance between the ignition coil terminals. Resistance should be approximately 1 ohm @ 68 degreesF (10 degreesC).
  12.  
  13. Measure coil secondary resistance between the ignition coil terminals and the distributor cap high tension lead terminals. Resistance should be approximately 10 kilohms @ 68 degreesF (10 degreesC) on Altima and 10 kilohms @ 68 degreesF (10 degreesC) on 130SX.
  14.  
  15. If resistance is not within specification, the coil may be faulty.
  16.  

REMOVAL & INSTALLATION



External Mount

See Figure 4



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Fig. Fig. 4: External mount ignition coils are attached to the cylinder head using two bolts (arrows)

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the ignition coil high tension wire.
  4.  
  5. Label and disconnect the coil electrical harness.
  6.  
  7. Remove the coil mounting bolts.
  8.  
  9. Carefully remove the coil.
  10.  

To install:
  1. Position the coil and tighten the mounting bolts securely.
  2.  
  3. Connect the coil electrical harness.
  4.  
  5. Connect the coil high tension wire.
  6.  
  7. Connect the negative battery cable.
  8.  

Internal Mount

The internally mounted ignition coils are an integral part of the distributor assembly. If the coil is determined to be defective, the distributor should be replaced as an assembly.

 
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