4.29.1 Description
The ignition amplifier monitor is very similar in operation to the injectors monitor, albeit checking primary coil current instead of voltage.
Internal hardware detection circuits in the ECM monitor the individual and group outputs to the coil primaries for incorrect current conditions. If a failure is repeatedly noted for a predefined number of times then a failure of the appropriate coil or group circuit is registered. If the failure is registered on two drive cycles the MIL will illuminate.