What does the primary circuit on the coil do?
What does the primary circuit on the coil do?
The Primary circuit includes battery voltage (B+) terminal attached to a 12-volt current source and a ground (B-) terminal attached to a power transistor that controls primary current flow. To create a spark, the transistor is commanded by the PCM to form a magnetic field by grounding the primary coil.
Can a bad coil ruin a spark plug?
Yes. Bad ignition coils can damage and or cause spark plugs to degrade prematurely. Since a faulty ignition coil causes a misfire, it will also cause the related spark plugs to foul. Always replace the spark plug or plugs that the bad coil was firing.
Are there ignition coil primary / secondary circuit codes?
If there are cylinder specific ignition coil primary /secondary circuit codes present, they may help you to pin point the defective circuit or coil/pack. If there are no cylinder specific codes present, you will need to find out which coil, coil pack, or circuit is malfunctioning.
What causes the ignition coil C trouble code?
A pulsing ground is supplied by the ECM, which activates the ignition spark and controls the ignition timing. If the voltage in the ignition control circuit for ignition coil C varies by more than 10% from allowed parameters, set by each automaker, a malfunction is noted and a P0353 code is stored. What causes the P0353 code?
When does the PCM set an ignition coil code?
The PCM sets an ignition coil control circuit code P0351-P0358 when it detects a problem with the ignition coil circuit. The last digit of these codes references the cylinder where the issue is occurring. For example, P0351 indicates a fault in the #1 cylinder coil circuit.
What causes a p0350 ignition coil to malfunction?
Potential causes for this code to set are: Open or shorted primary/secondary circuits. Defective ignition coils or coil pack/s. Bad ignition system relay. Blown fuses or fusible links. Faulty PCM or a PCM programming error.
The PCM sets an ignition coil control circuit code P0351-P0358 when it detects a problem with the ignition coil circuit. The last digit of these codes references the cylinder where the issue is occurring. For example, P0351 indicates a fault in the #1 cylinder coil circuit.
How to check primary circuit resistance on ignition coil?
Attach one lead of your multimeter to each terminal on the coil and set the meter to read ohms. This tests the coil primary circuit; typical readings should be 0.4 to 2 ohms. Consult the manufacturer’s repair information for the exact specifications. Next, check the secondary circuit resistance.
What can cause an ignition coil to fail?
Ignition coils can fail for a variety of reasons. In some cases, the insulation of the coil gets damaged, causing a short. In other cases, the problem stems from bad spark plugs and wiring issues.
What causes a p0351 code on an ignition coil?
In some cases, the insulation of the coil gets damaged, causing a short. In other cases, the problem stems from bad spark plugs and wiring issues. The P0351 code may appear when your car’s primary computer, which is often referred to as the powertrain control module (PCM), perceives a problem with the cylinder #1 ignition coil or its circuit.
