Ignition System Description for Cadillac Eldorado 2000
The ignition control modules (ICM) is located on top of
the front and rear camshaft covers under the ignition coils. 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 high and 24X crank)
sent to the PCM for ignition control. |
| • | It creates a camshaft reference signal (1/2X cam high) 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.
