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Old 01-12-2002, 09:56 PM   #1
Scooby Specialist
Member#: 1997
Join Date: Jul 2000
Chapter/Region: MWSOC
Location: Des Plaines, IL
2006 Acura TL 6spd
STMGM6 alumni

Default how to test a coil pack?

So.... how do you figure out if a coil pack is bad? Tests anyone?
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Old 01-12-2002, 11:36 PM   #2
Richard L.
Scooby Specialist
Member#: 8465
Join Date: Jul 2001
Chapter/Region: NWIC
Location: Puget Sound, WA
'00 2.5RS Coupe, AW
'93 GMC Typhoon AWD


To check for an igniter voltage signal to the coil pack, remove the electrical connector from the coil pack. Connect a 12 volt test light to the battery positive terminal. Make sure it is an LED (Light Emitting Diode) type test light. Touch the test light probe to each of the outside terminals of the coil pack connector in turn as an assistant cranks the engine over with the starter. See if the test light blinks as the igniter provides the trigger signal to the coil pack. If the test light does not blink, there is a problem with the igniter, crankshaft sensor, ECU or related wiring.

To check the ignition coil's primary resistance, with the ignition off, disconnect the three-terminal connector from the coil. Connect an ohmmeter across terminals 1 and 2. This will test the 1-2 coil pack. Next connect the ohmmeter across terminals 2 and 3. This will test the 3-4 coil pack. The resistance should be between 0.63 and 0.77 ohms.

To check the ignition coil's secondary resistance, connect an ohmmeter between the companion cylinder coil towers. First test cylinder numbers 1 and 2, then cylinders 3 and 4. The resistance should be between 10.4 and 15.6 k-ohms (?)
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Old 01-13-2002, 06:14 AM   #3
Scooby Guru
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
'01 GC8 Dinged STM
'09 Concours 14 ABS Black


brian FYI testing the coil itself will honestly tell ya dick...i have seen coils be bad and test perfect and be firing thru the casing. Do you think you have a bad coil?? i'd be curious. Gimme a ring.

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Old 05-10-2012, 05:43 PM   #4
Scooby Newbie
Member#: 69459
Join Date: Aug 2004
Location: utah
2015 2.0 hatch
crystal white


are those resistances good for all scoobie coils? i have a 99 impreza l, with the n/a 2.2 (ej22 i believe). its misfiring on 3 and 4. i noticed they are both fed by the same coil, so i wanted to test this first before throwing money into it.

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