Data Displays

The ECM data series provides the ability to read data from all of the ECM 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 ECM.

• EDO1 - TPS
  
  Display range should be between -10.0 to 90.0, displayed in Degrees (Throttle Angle). EDO1 is the throttle angle in degrees reported from the TPS. Typical values range from 2.0 to 6.0 at warm idle to approaching 80 at wide open throttle.
• EDO2 - kPa MAP
  
  Display range should be between 14 to 109, displayed in kiloPascals (kPa). EDO2 is the engine intake pressure reading reported by the MAP sensor. Typical values range from 35-55 kPa at warm idle to approaching BARO at wide open throttle.
• EDO3 - kPa BARO
  
  Display range should be between 61 to 103, Displayed in kiloPascals (kPa). EDO3 is the barometric pressure or atmospheric pressure reading that is calculated from the MAP sensor input to the ECM. Typical values range from 103-96 kPa at sea level and decreasing as altitudes increase.
• EDO4 - COOLANT
  
  Display range should be between -40 to 151, displayed in degrees (Centigrade). EDO4 is the engine coolant temperature reading that is received from a thermistor in the engine coolant stream. Typical values range from 85-120°C at warm idle.
• EDO5 - MAT
  
  Display range should be between -40 to 151, Displayed in degrees (Centigrade). EDO5 is the Manifold Air Temperature reading that is received from a thermistor in the engine intake air stream. Typical values range from 50-100°C at warm idle, depending upon ambient temperature and engine speed.
• EDO8 - DEG SPARK
  
  Display range should be between 0 to 52, displayed in degrees (BTDC). EDO8 is the spark advance in degrees BTDC that the ECM is commanding for use by the EST system. If the base timing on the engine is set properly (at 10 degrees BTDC), the ECM Data parameter and a reading from a timing meter or timing light should agree.
• ED10 - BATT VOLTS
  
  Display Range should be between 0 to 25.5, displayed in volts. ED10 is the battery voltage that is measured by the ECM on the fuel pump feedback circuit. The ECM Data Parameter and a voltmeter connected to charging system or battery voltage should agree.
• ED11 - RPM
  
  Display range should be between 0 to 6375, displayed in Engine RPM. ED11 is the engine RPM that is calculated by the ECM from the rate at which distributor reference pulses are received from the HEI by the ECM on the distributor reference input. The ECM data parameter and a tachometer connected to the HEI system should agree.
• ED12 - MPH
  
  Display range should be between 0 to 255, displayed in Miles Per Hour. ED 12 is the vehicle speed received from the vehicle speed sensor located in the transaxle. The vehicle speed on the IPC and ED12 should agree while driving at a steady speed.
• ED19 - POWER STEERING
  
  Display range should be between 0 to 9961, displayed in kiloPascals (kPa). ED19 displays the power steering pressure reading that is received from the power steering pressure sensor. The display should increase as the steering wheel is turned due to an increase in power steering load.
• ED30 - LEFT INJECTOR PULSE WIDTH
  
  Display range should be between 0 to 99.9, displayed in milliseconds. ED30 is the injector pulse width in milliseconds that the ECM is commanding the left (front) bank injectors on.
• ED31 - RIGHT INJECTOR PULSE WIDTH
  
  Display range should be between 0 to 99.9, displayed in milliseconds. ED31 is the injector pulse width in milliseconds that the ECM is commanding the right (rear) bank injectors on.
• ED32 - LEFT OXYGEN SENSOR
  
  Display range should be between 0 to 1.16, displayed in volts. ED32 is the oxygen sensor voltage reading that is received from the left (front) oxygen sensor in the exhaust stream. The voltage should vary from less than .3 volts to greater than .6 as the fuel system controls from lean to rich. The oxygen sensor voltage will be about 0.45 volts when the sensor is cold.
• ED33 - RIGHT OXYGEN SENSOR
  
  Display range should be between 0 to 1.16, displayed in volts. ED33 is the oxygen sensor voltage reading that is received from the right (rear) oxygen sensor in the exhaust stream. The voltage should vary from less than 0.3 volts to greater than 0.6 volts as the fuel system controls from lean to rich. The oxygen sensor voltage will be about 0.45 volts when the sensor is cold.
• ED34 - LEFT OXYGEN CROSS COUNTS
  
  Display range should be between 0 to 255, displayed in counts. ED34, left oxygen sensor crossover counts, is calculated by the ECM from the number of oxygen sensor rich to lean toggles that have occurred within a 1 second period. Cross counts can be used to detect oxygen sensor activity. The oxygen sensor has detected more rich/lean toggles as the cross count number increases.
• ED35 - RIGHT OXYGEN CROSS COUNTS
  
  Display range should be between 0 to 255, displayed in counts. ED35, right oxygen crossover counts, is calculated by the ECM from the number of oxygen sensor rich to lean toggles that have occurred within a 1 second period. Cross counts can be used to watch oxygen sensor activity. The oxygen sensor has detected more rich/lean toggles as the cross count number increases.
• ED36 - LEFT FUEL INTEGRATOR
  
  Display range should be between 80 to 165, displayed in counts. ED36, left fuel integrator, can be used to follow the short term oxygen sensor rich/lean trends. A left fuel integrator value of 128 indicates that the ECM is not changing the fuel supply rate to the left bank. If the left oxygen sensor detects a rich mixture for a longer time than a lean mixture, the integrator value will decrease to subtract fuel and maintain an air/fuel ratio of 14.7:1. If the left oxygen sensor detects a lean mixture for a longer period of time than a rich mixture, the ECM will increase the integrator value to add fuel and maintain an air/fuel ratio of 14.7:1. The integrator is reset to 128 during open loop, acceleration, deceleration, and some heavy engine load conditions.
• ED37 - RIGHT FUEL INTEGRATOR
  
  Display range should be between 80 to 165, displayed in counts. ED37, right fuel integrator, can be used to follow the short term oxygen sensor rich/lean trends. A right fuel integrator value of 128 indicates that the ECM is not changing the fuel supply rate to the right bank. If the right oxygen sensor detects a rich mixture for a longer time than a lean mixture, the integrator value will decrease to subtract fuel and maintain an air/fuel ratio of 14.7:1. If the right oxygen sensor detects a lean mixture for a longer period of time than a rich mixture, the ECM will increase the integrator value to add fuel and maintain an air/fuel ratio of 14.7:1. The integrator is reset to 128 during open loop, acceleration, deceleration, and some heavy engine load conditions.
• ED38 LEFT - BLOCK LEARN FUEL
  
  Display range should be between 0 to 255, displayed in counts. ED38, left block learn fuel, can be used to follow the long term oxygen sensor rich/lean trends. A left block learn fuel value of 128 indicates that the ECM is not changing the fuel supply rate to the left bank. If the left oxygen sensor detects a rich mixture for a longer time than a lean mixture, the integrator value will decrease to subtract fuel and maintain an air/fuel ratio of 14.7:1. If the integrator indicates a lean mixture for a long period, the ECM will increase the block learn fuel value to add fuel and maintain an air/fuel ratio of 14.7:1.
• ED39 - RIGHT BLOCK LEARN FUEL
  
  Display range should be between 0 to 255, displayed in counts. ED39, right block learn fuel, can be used to follow the long term oxygen sensor rich/lean trends. A right block learn fuel value of 128 indicates that the ECM is not changing the fuel supply rate to the right bank. If the right oxygen sensor detects a rich mixture for a longer time than a lean mixture, the integrator value will decrease to subtract fuel and maintain an air/fuel ratio of 14.7:1. If the integrator indicates a lean mixture for a long period, the ECM will increase the block learn fuel value to add fuel and maintain an air/fuel ratio of 14.7:1.
• ED70 - CRUISE FEEDBACK
  
  Display range should be between 0 to 100, displayed in percent. ED70, cruise feedback, is the percent servo stroke being reported to the ECM from the servo assembly, This parameter can be used during ECM override ESO7 to verify proper servo operation.
• ED98 - IGN CYCLES
  
  Display range should be between 0 to 50, displayed in Ignition Key Cycles. ED98 is a counter that is incremented by one count each time that the ignition key is cycled from "ON" to "OFF". The ignition cycle count is reset to 0 each time that memory power is removed from the ECM and each time that an ECM trouble code is logged. In normal operation, the counter counts up to 50, then rolls over to 0 and begins to count to 50 again. If a code is set, the ignition counter can be used to see how many ignition cycles have passed since the code was set.
• ED99 - PROM I.D.
  
  Display range should be between 0 to 9999, displayed in PROM I.D. Code Number. ED99 is a PROM identification code number that is unique to each ECM emissions calibration. The PROM ID is used to verify that the proper PROM has been installed in the ECM and to identify different PROM calibrations without performing ECM removal and replacement.