General Information

High Voltage Switch ignition system consists of the following components and wiring circuits:
^ The Ignition Control (IC) module The ignition coil
^ The Powertrain Control Module (PCM)
^ The Crankshaft Position (CKP) sensor
^ The Camshaft Position (CMP) sensor
^ The distributor, the distributor cap, and the rotor.

The EI wiring circuits between the CKP and PCM use the following service common names:
^ CKP sensor 1 signal
^ Low reference
^ 12-volt reference

The EI wiring circuits between the CMP and PCM use the following service common names:
^ CMP sensor signal
^ Low reference
^ 12-volt reference

The EI wiring circuits between the PCM, IC module, and coil use the following service common names:
^ IC timing control
^ IC output signal

The IC module and the ignition coil both receive fused power on the ignition 1 voltage circuit. The IC module is also supplied an independent ground connection

Purpose
The EI system is responsible for producing and controlling a high energy secondary spark. This spark is used to ignite the compressed air/fuel mixture at precisely the correct time to provide optimal performance, fuel economy, and control of exhaust emissions.

Operation
This electronic ignition system is known as a High Voltage Switch (HVS) distributor ignition system. Trigger information is supplied only by the CKP sensor The CMP (HVS) is located inside the distributor, and is used for fuel injector sequencing and misfire diagnosis. There is no back-up or by-pass system used, so the engine will not run without a valid CKP input. The PCM signals the coil to tire through the IC module. The resulting secondary energy is distributed to the spark plugs by a conventional distributor cap and rotor assembly.