Toyota Tercel 1984-1994 Repair Guide

Ignition Coil

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TESTING



See Figures 1 and 2

This test requires the use of an ohmmeter. When using this tool, make sure the scale is set properly for the range of resistance you expect to encounter during the test. Always perform these tests with the ignition OFF.

Primary Resistance

In order to check the coil primary resistance, you must first disconnect all wires from the ignition coil terminals. Using an ohmmeter, check the resistance between the positive and the negative terminals on the coil. The resistance should be:



0.4-0.5 - on all except Canada and wagons
 
1.2-1.5 - on Canada and wagons
 

If the resistance is not within these tolerances (range), the ignition coil must be replaced.



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Fig. Fig. 1: Checking the coil primary resistance

Secondary Resistance

In order to check the coil secondary resistance, you must first disconnect all wires from the ignition coil terminals. Using an ohmmeter, check the resistance between the positive terminal and the coil wire terminal. The resistance should be:



7.7-10.4 k- on all Canada, wagons and 1984-1986 sedans
 
10.2-13.8 k- on 1987-1994 U.S sedans
 

If the resistance is not within these tolerances (range), the coil must be replaced.



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Fig. Fig. 2: Checking the coil secondary resistance

REMOVAL & INSTALLATION



See Figures 3 through 8

Although it is easier to access the internal coil with the distributor removed, it can be changed without removing the distributor. A selection of various short screwdrivers will be required for access to the screws.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the distributor cap with the wires attached and set it aside.
  4.  
  5. Remove the rotor and the dust cover(s).
  6.  
  7. Remove the nuts and disconnect the wires from the terminals on the coil.
  8.  
  9. Remove the four retaining screws and remove the coil. Note the gasket below the coil-remove it carefully to avoid damage.
  10.  

To install:
  1. Install the coil, paying close attention to the gasket and its placement.
  2.  
  3. Connect the wiring to the coil and be careful of the routing of the wires.
  4.  
  5. Install the dust cover(s), the rotor and the cap.
  6.  
  7. Reconnect the battery.
  8.  



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Fig. Fig. 3: The distributor cap is retained by small bolts



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Fig. Fig. 4: Once the retaining bolts have been removed, the cap can be lifted out from the distributor. Be careful not to damage any components in the process



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Fig. Fig. 5: The rotor can be pulled straight out from the distributor shaft. If the metal contact on the end of the rotor is bent, it must be replaced, not straightened



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Fig. Fig. 6: The ignition coil dust cover is retained by two small tangs on the coil. Use care when removing it to prevent breaking the clips



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Fig. Fig. 7: Removing the ignition coil attaching screws



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Fig. Fig. 8: Always be sure that the gasket is in place before installing the distributor cap

 
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