P2321 LINCOLN - Ignition Coil 'H' Primary Control Circuit Low
- Faulty Ignition Coil 'H'
- Ignition Coil 'H' harness is open or shorted
- Ignition Coil 'H' circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine may be running rough
P2321 Lincoln DescriptionThe current flow, or dwell, through the primary ignition coil is controlled by the Powertrain Control Module (PCM) by providing a switched ground path through the ignition coil driver to ground. When the ignition coil driver is switched on, current rapidly builds up to a maximum value, determined by the coil inductance and resistance. When the current is switched off, the magnetic field collapses which induces a secondary high voltage surge and the spark plug is fired. This high voltage surge creates a flyback voltage which the PCM uses as a feedback during the ignition diagnostics. The PCM continuously monitors the ignition system for concerns. The P2321 code sets when the PCM detects a short to voltage in the circuit.
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