P2309 FORD - Ignition Coil 'D' Primary Control Circuit Low

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Ignition Coil 'D'
  • Ignition Coil 'D' harness is open or shorted
  • Ignition Coil 'D' circuit poor electrical connection

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine may be running rough

P2309 Ford Description

The 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 P2309 code sets when the PCM detects a short to voltage in the circuit.
OBDII Code P2309 Ford - Ignition Coil 'D' Primary Control Circuit Low - AutoCodes.com

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P2309 FORD Comments

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