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Home >> Buick >> 1990 >> Reatta 2D Convertible, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - ECM >> Manual Operation Of Service Mode >> System Selection

System Selection

  1. After all trouble codes have been displayed, the SERVICE MODE system can be directed to perform specific system diagnostic tests. See DISPLAYING TROUBLE CODES  in this article. Following the trouble code display, the first system available for testing will automatically be displayed. For example: ECM? may now be present on the display.
  2. To select the desired system, (ECM, BCM, IPC, or SIR), advance and stop the DIC display as follows: Depressing the FAN DOWN button on the ECCP will cycle the system selection list. When the desired diagnostic system is displayed, depress FAN UP button on ECCP and the displayed system will be selected for testing.
  3. Depressing BI-LEV button on ECCP will exit diagnostics and return to normal IPC and ECCP operation.
NOTE: To cancel a system selection and activate a repeat of the system selection process, depress the OFF button on the ECCP.