GM Cadillac Deville_Fleetwood_ELD_Seville 1990-1998

Ignition Module


On the 3.0L engine, the (PCM) Powertrain Control Module is used in place of a ignition module. The PCM is designed to maintain exhaust emission levels to Federal or California standards, while providing excellent driveability and fuel efficiency. The control module monitors numerous engine and vehicle functions and controls the following operations.

Fuel control
Ignition control (IC)
Knock Sensor (KS) system
Automatic Transaxle shift functions
Cruise Control enable
Evaporative Emission (EVAP) Purge
A/C clutch control
Cooling fan control

The Ignition Control Module (ICM) on the 4.6L engine is located on the top of the rear camshaft cover. The ICM performs several functions:

It monitors the ON-OFF pulses produced by the 2 crankshaft and one camshaft position sensors
It creates a camshaft reference signal sent to the PCM to ignition control
It creates a camshaft reference signal sent to the PCM for fuel injection control
It provides a ground reference to the PCM
It provides a means for the PCM to control spark advance

The ICM is not repairable. When the module is replaced, the remaining components must be transferred to the new module


4.6L Engine
  1. Remove the spark plug wires at the ignition control module assembly.
  3. Remove the four electrical connectors at the ignition control module.
  5. Remove the four bolts (4 and 8) retaining the IC module assembly to the rear camshaft cover.
  7. Remove the IC module assembly from the vehicle.
  9. Remove the ignition coils from the IC module assembly (1, 2, 3, and 7).
  11. Remove the IC module from the assembly bracket.

To install:

  1. Installation is the reversal of the removal procedure.