What supplies the voltage to the coil packs - Cars & Trucks

Assuming your firing order at the plugs is still correct 1, 3, 4, 2, - 1 being the cylinder nearest the belts and pulleys, a no spark at the coil pack is the next thing to check. Check the voltage supply to the coil is OK before you replace it. If the coil isn't getting voltage it may not be the coil causing the issue.

Did you check the supply voltage

Looking OK is not the answer. Go to a wrecking yard, get another coil pack and try it. If you mean there is no power to the pack then get a pal and an electrical tester and check the continuity of the supply. Be careful, the voltages at the coil are high enough to kill.

The check engine light is most likely a misfire code. You need to check your coil packs for supplied voltage. If you have 12 volts supplied, check your ground to the packs. If your ground is good then most likely the coil pack is pad.

coil packs and coils burn out from over voltage supplied to them --Ie 12 volts to a 7.5 volt coil. I would check the voltage in the supply wire connections and check the required voltage from the cpu /ECM. Run fault codes and look for a short to ground situation

this could be a coil pack going bad. If you are unfamiliar with these its the electric packs that send the voltage through the spark plug wires to the spark plugs. the coil pack determine the firing order and if one is misfiring it is usually most noticeable at take off. coil packs typically supply spark for two cylinders and are fairly inexpensive to replace that is where i would start. i hope this helps

Either the spark plug is faulty or the coil pack is faulty.The spark plugs get power to spark from coil packs.

If the engine has no spark, check for voltage at the coil positive terminal when the ignition key is on. If NO voltage, then problem is on the trigger side of the coil (pickup, crank sensor, ignition module or primary wiring circuit).

But If there is NO voltage at the coil itself, then in that case the problem is on the supply side (the ignition switch or ignition wiring circuit).

But if the coil has voltage, then problem may be a bad high voltage output wire from the coil to spark plugs or hairline cracks in the coil output tower.------Getting this all possibilities checked will point towards the exact faulty part which is to be replaced.----------This should help.Thanks.Helpmech.

The spark plugs receives power to spark from coil pack.Check the power at the coil pack and also check the voltage at the coil pack with meter.If the coil pack shows proper power as well as voltage then its fault in spark plugs.Otherwise its faulty coil pack.The coil pack receives power from battery.so also check the voltage of the battery it should be exact 12 volt.
If the battery shows low voltage then the battery needs to be re-charged.
Then check out.
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DTC 63 Will Set When
No voltage is supplied by the ECM through the EST “B” line while reference pulses are received by the ECM from the crankshaft position sensor
check white wire terminal B on ignition coil to ECM terminal C14 for open circuit or short to ground while disconnected if thats ok check for voltage signal at B while cranking no signal ECU faulty. voltage signal also on A terminal while cranking and check earth terminal C to body no higher than 5 Ohms
power is terminal D 12V
if getting power, earths good, and both signal voltages are going into coil pack, coil pack is faulty.

The secondary (high voltage) side of the ignition coil can be checked with an ohmmeter.
1. Label and disconnect spark plug wires from coil pack.
2. Connect an accurate ohmmeter between terminals 1 and 6 and take reading. Repeat for terminals 3 and 4 and for terminals 2 and 5.

Note the readings and compare the three


If no faults are found with the supply voltage, impulse signal, wiring, and resistance at coil, then the ignition coil pack should be replaced.