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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Testing & Diagnosis (REATTA, Riviera, TORONADO & TROFEO) >> Snapshot >> ECM Snapshot

ECM Snapshot

  1. ECM snapshot is slightly different from BCM snapshot because snapshot must be manually taken and then data and inputs can be reviewed. No previously stored information is recalled as in BCM snapshot. To enter ECM snapshot:
    • 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 .
    • Select SNAPSHOT test type. See TEST TYPE SELECTION .
      NOTE: To cancel a system selection and repeat the system selection process, depress the OFF button on the ECCP for non-CRT equipped vehicles or touch LEVL key on CRT monitor panel for CRT equipped vehicles.
  2. Immediately following selection of SNAPSHOT, system will display message SNAPSHOT TAKEN. See Figure and Figure . Message appears for 3 seconds to indicate all ECM data and inputs have been stored in memory. Following this 3-second information storage verification period, display will automatically proceed to first available snapshot test type (i.e., E SNAP DATA or E SNAP INPUTS).
  3. At this point, depressing FAN DOWN button (ECCP equipped) or touching NO key (CRT equipped) will display next available snapshot test type. Display may be toggled between E SNAP DATA and E SNAP INPUTS.
  4. Depressing FAN UP button (ECCP equipped) or touching YES key (CRT equipped) with E SNAP DATA or E SNAP INPUTS displayed will select that particular test type. Display is now controlled as it would be for non-snapshot data and inputs displays; however, all values and status information represents memorized vehicle conditions. See SPECIFIC TEST SELECTION .
  5. Depressing FAN UP button (ECCP equipped) or touching YES key (CRT equipped) with ECM SNAPSHOT? displayed will again display SNAPSHOT TAKEN message to indicate new information has been stored in memory. This information can be accessed as previously described.
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