CODE 41, IGN SIGNAL CKT NO SIGNAL, XFi W/ESC IGN SYSTEM

This ignition system does not use a vacuum advance. Ignition system sends a signal to ECM. ECM uses a driver to make the coil fire a spark to the distributor. This is done by a driver pulling 12 volts, from coil, low. When 12 volts from the coil is pulled low, ECM looks for a low voltage signal. If the signal is not present continuously for more than 6 times while cranking, Code 41 will be set. If Code 42 is set at the same time, repair Code 42 first.

1. This simulates a crank signal to the ECM. ECM will then ground ignition coil to create a spark.
2. Checks voltage supply to coil.
3. Check for low voltage on ignition coil. The noise suppressor may be shorted to ground.
4. Checks if ECM is shorted to ground in Brown/White wire.
5. High resistance in the coil could cause a low voltage.