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SEGMENT CHECK The purpose of illuminating the IPC is verify all segments of the LED displays are working. The turn signal indicators do not light during this check. Further diagnosis should not be attempted unless all segments appear, as this could lead to misdiagnosis. If any portions or segments of the IPC displays are inoperative, the IPC must be replaced.TROUBLE CODE DISPLAY After diagnostics is entered, any trouble codes stored in computer memory will be displayed. Codes may be stored for the PCM, IPC, AC, DERM, TCS or RSS systems.Each trouble code consists of the system abbreviation (P - Engine (PCM), I - IPC, A - AC, R - SIR, T - TCS, or S - RSS), a three digit code identifier, and the letter C or H. All codes for each system are displayed together, in the order of their three digit number (lowest first - i.e. E013, EO14, etc.). The final digit of the code, a "C" or an "H" is used to indicate whether the code is current or history. "C" means the fault was still present the last time the diagnostic test was run, while "H" means the failure was not present the last time the code was tested for.If no codes are present for a system, a "NO X CODE" message (with X being the system i.e. E, I, A, R, T or S) will be displayed. If the communication line to a component Is not operating, a "NO X DATA" message will be displayed, indicating that the IPC could not communicate with that system.At any time during the display of trouble codes, if the "AUTO" button on the IPC is depressed the system will exit "Service Mode" and go back to normal vehicle operation.STATUS LIGHTS While in diagnostics, the displays on the CCC may be used to indicate the status of various inputs and operating conditions. The meaning of each word or symbol on the panel will change depending on whether the ACP or PCM system level is selected. This is detailed in the sections covering these systems.SELECTING THE SYSTEM After trouble codes have been displayed, a specific vehicle system (PCM, IPC, AC, SIR, TCS, or RSS) may be selected for testing.The first available system will be automatically displayed (i.e. PCM). While selecting the system to test, any of the following actions may be taken:
SELECTING THE TEST TYPE Having selected a system, the first available test type will be displayed (i.e. PCM DATA). While selecting a specific test type, any of the following actions may be taken:
These do not relate. Looking for current S code.Any found?