Toyota Corolla 1970-1987 Repair Guide

Ignition Coil

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PRIMARY RESISTANCE CHECK



See Figures 1 and 2

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:



1T-C: 1.2-1.6 ohms.
 
2K-C w/o igniter: 1.1-1.4 ohms; w/igniter: 1.2-1.6 ohms.
 
1980 2T-C Federal and Canada: 0.3-0.4 ohms; California: 0.8-1.0 ohms.
 
1981-81 2T-C: 0.8-1.0 ohms.
 
3A-C and 3A-LC US: 0.3-0.4 ohms; Canada: 1.1-1.4 ohms.
 
3A-GE: 0.4-0.7 ohms.
 

If the resistance is not within these tolerances, the coil will require replacement.



Click image to see an enlarged view

Fig. Fig. 1: Checking the coil primary resistance-all except 1983 and later A-series engines



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Fig. Fig. 2: Checking the coil primary resistance-1983 and later A-series engines

SECONDARY RESISTANCE CHECK



See Figures 3 and 4

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 negative terminal and the coil wire terminal. The resistance should be:



1T-C: 10,100-12,800 ohms.
 
2K-C-w/o igniter: 8,000-11,000 ohms; w/igniter: 10,000-14,000 ohms.
 
1980 2T-C: 8,400-11,400 ohms; California: 11,400-14,400 ohms.
 
1981-81 2T-C: 11,400-14,400 ohms.
 
3A-C and 3A-LC: 7,700-10,300 ohms.
 
3A-GE: 11,000-16,000 ohms.
 

If the resistance is not within these tolerances, the coil will require replacement.



Click image to see an enlarged view

Fig. Fig. 3: Checking the coil primary resistance-all except 1983 and later A-series engines



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Fig. Fig. 4: Checking the coil primary resistance-1983 and later A-series engines

 
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