Electro/Mechanical Instrument Cluster (EMIC)

ELECTRO/MECHANICAL INSTRUMENT CLUSTER (EMIC)
The Instrument Cluster contains a Fuel, Voltmeter, Coolant Temp, and Oil Pressure gauge, a Tachometer and a Speedometer. With the exception of the Voltmeter, the cluster positions the gauges with PCI Bus messages received from the PCM. The Voltmeter operates directly OFF of the Fused B+ Switched Ignition Output circuit that supplies ignition voltage for the cluster.

The Instrument Cluster also contains warning indicators that are illuminated by hard wired inputs or by messages received from other modules on the PCI Bus.

The Trip/Total Odometer is a Vacuum Fluorescent Display (VF) that is controlled by PCI Bus messages received from the PCM.

The cluster illumination lamps are hard wired in the Instrument Cluster. When the Park or Head-lamps are turned ON, the cluster receives a dimmed battery feed from the Headlamp Switch. The cluster I/O Processor controls the VF display dimming and also sends dimming level messages on the PCI Bus.

The EMIC will communicate with the DRB III to display PCI Engine Info, PCI Bus Info, and certain input/outputs. Cluster diagnostic capabilities that the DRB III will actuate are limited to the Cluster Calibration Points for the gauges. The DRB III can also extract active and stored Diagnostic Trouble Codes (DTC) from the Instrument Cluster.

The EMIC is also capable of performing a diagnostic Self-Test that is actuated by depressing and holding the Odometer trip reset stalk while cycling the ignition from the OFF to the ON position. After the cluster Odometer displays CHEC, releasing the reset stalk begins the test. The cluster will then position all of the gauges at specified calibration points and will illuminate all the PCI Bus controlled indicators. The cluster will also illuminate each segment of the VF display.

The EMIC can verify communications with the PCM, ID the module, or change the country code using the DRB III.