how do you test ignition coils and injectors using a multimeter?
06-12-2004, 01:08 AM
#1
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how do you test ignition coils and injectors using a multimeter?
what do you have to test and what reading should I get testing a coil and injector? the chilton is unclear here....
06-12-2004, 04:01 AM
#2
To Test Ignition Coils:
With the ignition off, disconnect the electrical connector from the ignition coil. Connect the positive (+) probe of an ohmmeter to terminal no. 1 and the negative (-) probe to terminal no. 2 of the coil connector - the meter should indicate infinite resistance. Reverse the meter leads ( negative probe to terminal no. 1 and positive probe to terminal no.2) - the continuity should be indicated, but not zero ohms. If the results are not as specified, replace the coil.
Connect an ohmmeter between the secondary terminal ( the one that the spark plug connects to) and terminal no. 1 - the meter should indicate infinite resistance. If not, replace the coil.
Note - Ohm meter to test coils is not the most reliable way. Some peoples’ coils tested perfectly, but they still misfired.
With the ignition off, disconnect the electrical connector from the ignition coil. Connect the positive (+) probe of an ohmmeter to terminal no. 1 and the negative (-) probe to terminal no. 2 of the coil connector - the meter should indicate infinite resistance. Reverse the meter leads ( negative probe to terminal no. 1 and positive probe to terminal no.2) - the continuity should be indicated, but not zero ohms. If the results are not as specified, replace the coil.
Connect an ohmmeter between the secondary terminal ( the one that the spark plug connects to) and terminal no. 1 - the meter should indicate infinite resistance. If not, replace the coil.
Note - Ohm meter to test coils is not the most reliable way. Some peoples’ coils tested perfectly, but they still misfired.
06-13-2004, 01:33 AM
#3
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i placed the positive lead against pin 1 and the negative lead against pin 2 and put my multimeter into ohm/resistance mode....in one range setting, I got 1.5-1.6 across all the coils and then I switched range settings and got something like 0.5 across the coils
06-14-2004, 05:59 AM
#6
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If you have intermittent misfires, an ohmmeter test is useless. As these coils weaken, they may misfire only under operating conditions... I had intermittent misfires that set the CEL but would not indicate which cylinder.. ended up replacing all 6 coils..
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