Circuit Description
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
There are two separate ignition module assemblies, one for each bank of cylinders. Each assembly contains an ignition control (IC) module and four ignition coils. Both IC modules consist of the following circuits:
- Ignition 1 voltage circuit.
- Ground circuit.
- IC circuits for cylinders 1, 3, 5, 7 on bank 1 ignition module.
- IC circuits for cylinders 2, 4, 6, 8 on bank 2 ignition module.
- IC module low reference circuit.
Each ignition coil connects directly to its spark plug through a wire spring conductor housed in a short spark plug boot. The IC circuits transmit timing pulses from the Powertrain Control Module (PCM) to the IC modules which triggers the ignition coils in the proper sequence for spark plug firing. The PCM monitors each IC circuit for improper voltage levels. If an improper voltage level is detected on an IC circuit a DTC will set.