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HOMESERVICE MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 13 (BODY CONTROL MODULE)SELF-DIAGNOSTIC SYSTEMNOTES
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4

Self-Diagnostic System: Notes

1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Notes
WARNING: This page is about a different car, the 1998 Oldsmobile Cutlass and 1998 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Body Function Controller (BFC) is equipped with a self-diagnostic system, which detects system Diagnostic Trouble Codes (DTCs) or abnormalities. When a malfunction occurs, BFC will store a DTC. See BFC DTC DEFINITIONS. Malfunctions are recorded as history/intermittent failures or as current failures. Current DTCs indicate BCM has detected a fault which is currently present. A history DTC is a fault that disappears in the next ignition cycle.

A scan tool can be used to retrieve and clear DTCs. The scan tool also has several features that can be used to help locate an intermittent condition. When scan tool is used for system tests, it will display values actually seen or commanded by various systems (i.e., BFC, PCM, instrument cluster, EBCM or SDM). This will usually include the following types of information:

  • Analog Data Input - Displays analog input seen by system.
  • Inputs/Outputs - Displays digital values as seen by system, and provides indication of whether input or output has cycled.
  • Special Functions (Output Controls) - Allows for outputs of system to be set at a desired value (ON or OFF).
  • Clear Codes - Will erase DTCs for system currently selected (if problem still exists in system, DTC may immediately reset).
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