Ignition Control Module Replacement. Cadillac Concours 1996

For 1990-2009 cars

## Ignition Control Module Replacement L47

The ignition control module (ICM) is located on top of the rear camshaft cover. The ICM performs sever functions:

• | It monitors the ON-OFF pulses produced by the tow crankshaft and the camshaft position sensor.

• | It crates a 4X and 24X reference signal (4X ref. hi and 24X crank) sent to the PCM for ignition control.

• | It creates a camshaft reference signal (1/2X cam hi) sent to the PCM for fuel injection control.

• | It provides a ground reference (ref. lo/cam lo) to the PCM.

• | It provides a means for the PCM to control spark advance (bypass and ignition control), called ignition control mode.

• | It provides a limited means of controlling spark advance without PCM input, called module mode.

The ICM is not repairable. When a module is replaced, the remaining components must be transferred to the new module. Refer to Ignition Control Module Replacement (Assembly) .