BMW 12131703228 Ignition Coil

To test the ignition coil of an E36 model (except for the M44 engine), take off the valve cover trim or coil pack cover first, shut off the ignition switch, unplug the harness connector and measure the primary resistance between two outer terminals (terminals 1 and 15) of a coil socket aiming at approximately 0.4-0.8 ohms; you must replace it if exceeds this range. For this reason, there is an assembly with a combined ignition coil which employs four different coiled M44 engines; therefore, turn off all spark plugs on them and uncouple this set of wires by rotating electrical connector to the left side to receive proper evaluation at primary resistance via each terminal specified for separate coils (coil 1: Pin 1-Pin 2, coil 2: Pin 6-Pin 2, coil3: Pin7-Pin2, coil4: Pin5-Pin2) in order to obtain about 0.4-0.8 ohms; upon falling out from these limits, you will have to change a whole rack of coils in one go. There are several steps involved when removing and installing an Ignition Control Module (ICM). The Ignition Control Module (ICM) on these models is inherent in each particular ignition coil such that they cannot be replaced individually from the coils necessitating where ICM failures occur only complete replacement of those items as typified here.

Ensure the ignition is switched OFF, then remove the ignition coils cover. Lift up on the lock to release the ignition coil electrical connector, and remove the fasteners while noting the position of the coil ground wire. Pull the ignition coil straight up and off the spark plug for removal. For installation, reverse the removal process and ensure that ground cables or wires are reattached. Finally, check for fault codes and clear and reset the ECM memory.

Slide the rod-shaped ignition coil straight out of the spark plug hole.

Remove the coil mounting nuts and pull the coil straight out.

A three-dimensional map is digitally stored in the ECM, and the initial ignition point is determined by the crankshaft sensor during cranking. The ECM continuously adjusts ignition timing based on operating conditions once the engine is running.