Principle of Operation

Principle of Operation

When KLI5 is switched "on" the ECM is ready for engine management. The ECM will activate a ground path to energize the three Engine Control Module Relays in the IVM.

- The 1st ECM Relay supplies operating voltage through a fuse (in the IVM) to the ECM.
- The 2nd ECM Relay supplies operating voltage through a fuse (in the IVM) to the Fuel Injectors.
- The 3rd ECM Relay supplies operating voltage through a fuse (in the IVM) to the Oxygen Sensors.

The Ignition Coil Relay (4th relay) is energized by the CAS Module which supplies operating voltage through a fuse (in the IVM) to the Ignition Coils.

The IVM receives high amperage voltage supply from fuses F101 and F104 (100 Amp). The fuse junction is located on the right inner fender of the engine compartment (under the remote charging post). This supply is for the consumers that are controlled by the IVM internal relays.







When KLI5 is switched "off" the ECM operating voltage is removed. The CAS Module will maintain voltage to the Ignition Coil Relay for a few seconds to maintain ignition coil activation (Emission Optimized - introduced in 2000 MY).

Ground is required to complete the current path through the ECM. The ECM also:







- Internally links a constant ground (1) to the engine sensors.
- Switches ground (2) to activate components.