Use a scan tool to display instrument cluster data. This information assists in determining whether the instrument cluster is operating properly and whether the instrument cluster is sending or receiving the proper data to and from a particular system. The instrument cluster uses data received from other systems in order to carry out some functions. If the instrument cluster receives incorrect data from another system, the instrument cluster may appear to function improperly. Use the scan tool in order to review the data from the systems that interact with the instrument cluster. An example would be an oil pressure gauge. An oil pressure gauge that is not displaying the proper oil pressure involves the Powertrain Control Module (PCM). The cluster processes information received from the PCM and displays the oil pressure on the gauge. To diagnose this condition using a scan tool, select the PCM data display function, then check if the PCM is receiving and interpreting the proper oil pressure data from the sensor. If the PCM is not reading the proper oil pressure the instrument cluster is not the problem and the PCM must be further diagnosed. If the PCM is receiving and interpreting the proper oil pressure data, use the scan tool gauge sweep function to command the oil pressure gauge to move to the high pressure or low pressure position. This is an example of how the scan tool can provide diagnostic information without any time spent on disassembly of the vehicle or probing of circuits. This example can also be applied to an indicator malfunction.