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Home >> Cadillac >> 1991 >> Allante F7/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Self-Diagnostics >> How To Operate Diagnostics >> PCM Data Displays
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PCM Data Displays

The PCM data series provides the ability to read data from all of the PCM sensor inputs and to observe calculated and commanded values for fuel delivery rate and fuel system rich/lean performance. The following are a summary of each parameter for the PCM:

  1. ED01 - TPS

    Throttle Position Sensor (TPS). Display shows degrees of throttle opening from -9 to 90.

  2. ED02 - MAP

    Manifold Absolute Pressure (MAP) sensor. Display shows manifold pressure in Kilo Pascals (kPa) from 14 to 108.

  3. ED03 - BARO

    Barometric Pressure (BARO). Display shows the BARO in kPa from 60 to 102. The BARO reading is taken at key ON and is corrected at Wide Open Throttle (WOT).

  4. ED04 - COOLANT

    Coolant Temperature Sensor (CTS). Display shows the temperature in degrees Celsius from -40 to 151.

  5. ED05 - MAT

    Manifold Air Temperature (MAT). Display shows the temperature in degrees Celsius from -40 to 151.

  6. ED08 - DEG SPARK

    Spark Advance. Display shows advance in degrees Before Top Dead Center (BTDC) from 0 to 90.

  7. ED10 - BATT VOLTS

    Battery Voltage, Display shows volts from 0 to 25.6.

  8. ED11 - RPM

    Engine Speed. Display shows speed in Revolutions Per Minute (RPM) from 0 to 6370.

  9. ED12 - MPH

    Vehicle Speed. Display shows speed in Miles Per Hour (MPH) from 0 to 255.

  10. ED19 - P/S SENSOR

    Power Steering Pressure Sensor shows pressure in kPa from 0 to 9961.
    11. NOTE: Scan tool may display this heading.

  11. ED30 - MS LINJ PW
    Left Injector Pulse Width. Display shows pulse width In milliseconds (ms) from 0 to 99.6.
    12. NOTE: Scan tool may display this heading.

  12. ED31 - MS RINJ PW
    Right Injector Pulse Width. Display shows pulse width in milliseconds (ms) from 0 to 99.6

  13. ED32 - LOXY SENS

    Left Oxygen Sensor Voltage. Display shows volts from 0 to 99.

  14. ED33 - ROXY SENS

    Right Oxygen Sensor Voltage Display shows volts from 0 to .99.

  15. ED34 - LCROSS CTS

    Left Oxygen Sensor Cross Counts. Display shows counts from 0 to 255. The cross count is the number of times the voltage crosses the reference voltage of .45 volts in one second.
    16. NOTE: The cross count is the number of times the voltage crosses the reference voltage of .45 volts in one second.

  16. ED35 - RCROSS CTS
    Right Oxygen Sensor Cross Counts. Display shows counts from 0 to 255. The normal count position for the Integrator is 128, and indicates that the engine is operating normally. A count greater than 128 indicates that time is being added to the injector pulse width, which adds more fuel to the engine. A count less than 128 indicates time is being subtracted from the injector pulse width reducing the amount of fuel to the engine.

  17. ED36 - LINT FUEL

    Left Fuel Integrator. Display shows counts from 0 to 255. The normal count position for the Integrator is 128, and indicates that the engine is operating normally. A count greater than 128 indicates that time is being added to the injector pulse width, which adds more fuel to the engine. A count less than 128 indicates time is being subtracted from the injector pulse width reducing the amount of fuel to the engine.

  18. ED37 - RINT FUEL

    Right Fuel Integrator. Display shows counts from 0 to 255. The normal count position for the B/L is 128, and indicates that the engine is operating normally. The B/L value is based on Integrator learned values. It is stored in memory blocks of the long term memory according to MAP and RPM values. A count greater than 128 indicates that time is being added to the injector pulse width, which adds more fuel to the engine. A count less than 128 indicates time is being subtracted from the injector pulse width reducing the amount of fuel to the engine.

  19. ED38 - L B/L FUEL

    Block/Learn (B/L). Display shows counts from 0 to 255. The normal count position for the B/L is 128, and indicates that the engine is operating normally. The B/L value is based on Integrator learned values. It is stored in memory blocks of the long term memory according to MAP and RPM values. A count greater than 128 indicates that time is being added to the injector pulse width, which adds more fuel to the engine. A count less than 128 indicates time is being subtracted from the injector pulse width reducing the amount of fuel to the engine.

  20. ED39 - R B/L FUEL

    Block/Learn (B/L). Display shows counts from 0 to 255.

  21. ED70 - C/C FEEDBACK

    Cruise Control Feedback. Display shows the percentage of servo apply with 0 equaling full extend and 99 equaling full retract.

  22. ED71 - PRNDL 1

    2nd gear status. Display showing 00 indicates that the 2nd gear pressure switch is closed. Display showing 01 indicates that the 2nd gear pressure switch is open.

  23. ED72 - PRNDL 2

    Park Neutral (P/N) Status. Display showing 00 indicates that the P/N switch is closed and 01 the switch is open.

  24. ED98 - IGN CYCLES

    Ignition Cycles. Display shows counts from 1 to 50. The count increases by 1 with each key cycle.

  25. ED99 - PROM I.D.

    PROM Identification Code. Display shows a three digit code that identifies the PROM of the MEM-CAL unit.

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