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State Displays

  1. This allows technician to view conditions at signal level. The 2 types of signals are analog and digital. Analog signals are monitored at pins corresponding to vehicle harness splices (e.g. fuel pump relay). Digital signals correspond to data transmitted by system controllers. Both signals are displayed in common units (e.g. temperature), this information is not relative to diagnostic intent.
  2. Use up and down arrow keys on DRB-II to scroll through displays. Select STATE DISPLAYS or ENGINE. If ENGINE state display is selected, technician has the option to view either static state display or MIN/CURRENT/MAX value display.
  3. The STATIC display shows current conditions as they exist. The MIN/CURRENT/MAX display shows a history of specific sensor conditions. Maximum, current (static) and minimum values can be displayed for a specific sensor. To reset sensors or zero value, simply press ENTER key. This display can isolate intermittent faults.
  4. The following ENGINE state displays are available on the DRB-II.
    • Vehicle Program and Calibration Code  - Program numbers (PGM) indicate ECU is programmed for a specific engine. Calibration code (CAL) applies to manual or automatic transmission.
    • Battery  - Displays battery voltage.
    • H 2 O  - Engine coolant temperature is displayed in degrees Fahrenheit or Celsius.
    • Air  - Air temperature is displayed in degrees Fahrenheit and Celsius.
    • TPS  - Throttle Position Sensor (TPS) is displayed as WIDE OPEN, CLOSED or PARTIAL and percentage of opening from closed throttle to Wide Open Throttle (WOT).
    • A/C Status  - If any A/C signals are active, an abbreviated display will show: Select SEL, Predict PRE, Clutch CL and Cut-Out CO. If A/C signals are inactive, A/C OFF will be displayed.
    • Relay Status  - Displays EGR solenoid, B+ latch relay and fuel pump relay as on "+" or off "0". When EGR solenoid is off, vacuum is present. When EGR solenoid is on, vacuum is absent.
    • Barometric Pressure Reading  - Barometric pressure value can be used to test MAP sensor. A good MAP sensor will read within .60 in. Hg of current barometric pressure at sea level. Subtract .1 in. Hg for every 100 feet above sea level. Call weather bureau for current barometric pressure.
    • RPM  - Engine speed is displayed.
    • Exhaust Oxygen Sensor  - Displays voltage from O2 sensor and whether fuel system is "RICH" or "LEAN". Displays if system is in "DECEL" condition or "OPEN LOOP".
    • Pulse Width  - Displays the amount of time in milliseconds that the fuel injector is open.
    • ALFACL  - The closed loop pulse width correction factor is displayed in units from 0-255. ALFACL represents the correction used to calculate injector pulse width in response to oxygen sensor input. If oxygen sensor reads rich, ALFACL will decrease. If oxygen sensor reads lean, ALFACL will increase.
    • CTAVE  - This is average closed throttle value displayed as a percentage of full scale. The closed throttle switch provides a signal to the ECU to indicate throttle status.
    • KAM  - Keep Alive Memory (KAM) faults are displayed for the O2 sensor, MAP sensor, TPS, air temperature sensor and coolant temperature sensor. Next to sensor display, a pair of numbers is displayed. Each number reflects a period since ECU detected a fault. The first number corresponds to a sensed Low condition failure. The second number corresponds to a sensed High condition failure. When ECU detects a Low or High condition failure, then number 15 will be stored for the respective sensor. If the engine is started and closed loop is attempted and fault is no longer present, the counter will be decreased by one. If the fault is still present, counter will remain at 15. Values of "0" (zero) indicate a Low or High fault condition does not exist for sensor displayed. Values of 0-15 indicate the ECU has detected a fault at some time, but fault is not currently present (possible intermittent).
  5. The MIN/CURRENT/MAX display allows technician to observe operation of 6 different sensor values. Information is displayed as a 3-digit number. The first value is minimum reading, second number is current reading and third value is maximum reading. The monitored sensors are: MAP sensor, O2 sensor, Throttle Position Sensor (TPS), Coolant Temperature Sensor (CTS), Manifold Air Temperature (MAT) sensor and CTAVG (average learned closed throttle value).
  6. Typically sensors range between 2-252. Values less than 2 or greater than 252 will usually indicate a sensor is shorted or disconnected. Watch minimum and maximum values to help diagnose intermittent problems.
  7. The CUSTOM DISPLAY allows the user to program up to 2 screens, which can consist of STATE DISPLAYS MIN/CURRENT/MAX or SENSORS.
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