Data Display - HVAC System - Dual Zone

The scan tool displays the Instrument Panel Cluster (IPC) data. This information assists in determining whether the IPC is operating properly and whether the IPC is sending or receiving the proper data to and from a particular system. The IPC uses data received from other systems in order to carry out some functions. Therefore, if the IPC receives the incorrect data from another system, the IPC may function improperly. Use the scan tool in order to review the data from the systems that interact with the IPC. An example of the use of the scan tool data display functions, using an oil pressure gage system malfunction as an example, might involve Powertrain Control Module (PCM) data display. The oil pressure gage does not display the proper oil pressure readings or a LOW OIL PRESSURE message is displayed. To diagnose this condition using a scan tool, select the PCM's 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 IPC is not the problem and the PCM must be further diagnosed. If the PCM is receiving and interpreting the proper oil pressure data, select the IPC data display function, then check if the IPC is able to receive the proper oil pressure data from the PCM. If the IPC oil pressure data is correct and the oil pressure gage does not function properly, use the scan tool's output control function to command the oil pressure gage to a fix command position. This is an example of how the scan tool and IPC's diagnostics can provide valuable information without any time spent on disassembly of the vehicle or probing of circuits. This example can be applied to an indicator malfunction or other warning messages displayed as well as other IPC malfunctions.