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Home >> Buick >> 1991 >> Reatta 2D Convertible >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Pcm/BCM >> Entering Self-Diagnostics >> ECM Snapshot

ECM Snapshot

NOTE: If directed here from TEST TYPE SELECTION under MANUAL OPERATION OF SERVICE MODE, go to step 2).
  1. SNAPSHOT allows the recall of system operating specifications present at the exact time an ECM malfunction code was set. Up to 3 snapshots may be recalled. In addition, one snapshot may be triggered on demand. To enter snapshot, complete the following:
    • Enter self-diagnostics. See ENTERING SELF-DIAGNOSTICS.
    • Display trouble codes stored in memory. See DISPLAYING TROUBLE CODES.
    • Select ECM system for testing. See SYSTEM SELECTION under MANUAL OPERATION OF SERVICE MODE.
    • Select SNAPSHOT test type. See TEST TYPE SELECTION under MANUAL OPERATION OF SERVICE MODE.
      NOTE: To cancel snapshot test type selection and activate a repeat of the specific test type selection process, depress the OFF button on ECCP.
  2. Immediately following the selection of SNAPSHOT?, the system will display the message SNAP DONE. This message appears for 3 seconds to indicate all ECM data and inputs have been stored in memory. Following this 3 second information storage verification, the display will automatically proceed to the first available snapshot test type (i.e., SNAP DATA? or SNAP INPUTS?).
  3. At this point, depressing the FAN DOWN button will display the next available snapshot test type. Display may be toggled between SNAP DATA? and SNAP INPUTS?.
  4. Depressing the FAN UP button with SNAP DATA? or SNAP INPUTS? displayed will select that particular test type.
  5. At this point, the display is controlled as it would be for non-snapshot data and inputs displays; however, all values and status information represents memorized vehicle conditions. See EXPLANATION OF SPECIFIC TEST SELECTION and MAKING SPECIFIC TEST SELECTION under MANUAL OPERATION OF SERVICE MODE.
  6. Depressing the FAN UP button, with SNAP EC? displayed, will display the SNAP DONE message to indicate that new information has been stored in memory.
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