Ford
Type:
    Powertrain - Ignition System or Misfire - ISO/SAE Controlled
Description:
    Ignition Coil 'D' or 4 Primary/Secondary Circuit Conditions
Cause:
    Engine running, then the PCM did not receive a valid IDM signal from the ignition module. The PCM was able to identify that Coil 'D' failed

Generic
Type:
    Powertrain - Ignition System or Misfire - ISO/SAE Controlled
Description:
    Ignition Coil "D" Primary/Secondary Circuit