How to test ignition coil.
Here we have mentioned procedure for Chevy silverado vehicle.
The procedure to test ignition coil will be same for other vehicles too,just the difference will be wire colors.
Ignition coil testing starts here.
View the test diagram too:---------
Its very much possible that ignition switch is faulty,but if ignition switch is tested ok,then yes ignition coil is faulty and it causes issues like no spark on vehicle.
To confirm ignition switch is working properly test the red wire to the coil,,,it should have battery voltage with the key on.if not,,the problem is ignition switch.
If the 12 volt is present on red wire then problem is ignition coil and not the switch.
1998 Chevy Truck K 1500 Truck 4WD V8-5.7L VIN R
Ignition Coil Testing and Inspection, Component Tests and General Diagnostics: Ignition Coil Test
This test procedure should be confirmed to test the coil:-----
IGNITION COIL TEST
^ Make sure the ignition switch is "OFF."
1. Disconnect the distributor lead and wiring from the ignition coil.
CAUTION: Do not Insert the J 39200 probe into the ignition coil connectors. The female terminals could be spread and deformed, resulting In intermittent operation of the coil. Be sure to make contact with only the front edge of the terminals.
2. Connect an ohmmeter as shown in Figure, step 1. Use the high scale. The reading should be infinite. If not, replace the coil.
3. Connect the ohmmeter as shown in Figure, step 2. Use the low scale. The reading should be 0.2 - 0.5 ohms. If not, replace the coil.
4. Connect the ohmmeter as shown in Figure, step 3. Use the high scale. The meter should read 5k - 25k ohms. If not, replace the coil.
5. Reconnect the distributor lead and wiring to the coil.
If everything checks out to be perfectly ok,then problem is not the coil and fault is elsewhere.
But if the ignition switch is checked ok and problem is No spark then either is faulty spark plug or its issue with Ignition coil.
On some rare cases the issue is with cam sensor and crank sensor.
These details will help.
Thanks.
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