An indication by the ECM of a logged fault (malfunction) code.
Mass Air Flow (Grams/Sec) Range: 0 to 105 gr/sec
High Perf. Vehicles: 0 to 255 gr/sec
Mass air flow sensor input is used by the ECM to calculate fuel delivery.
As the air flow increases, the fuel delivery must also increase. Displayed
in grams per second.
MAP (kPa or Volts) Range: 10 to 105kPa, or 0 to 5 Volts
Manifold absolute pressure. Displayed in kilopascals, a unit of metric
pressure or volts. The reading should be low when the pressure is low
(and the vacuum is high).
Manifold Air Temp (°F) Range: -40° to + 389°
Manifold Air Temperature.
Mixture Control (% On Time) Range: 0 to 100% (0 to 60° of dwell)
For engines with computer controlled carburetors that set the air-fuel
mixture by energizing or de-energizing the solenoid. Displayed as a
percentage of duty cycle. A consistently low reading indicates that the
solenoid is allowed to stay off for longer periods for a richer mixture.
O2 Cross Counts
Oxygen sensor crossover reading, which is the number of times that the
sensor has switched back and forth between lean and rich conditions
since the last data-stream was sent.
Oil Level Low (Yes / No)
When the oil level reaches a minimum margin of safety the ECM will
indicate YES. Normal operating mode is NO.
Oil Temp (°F) Range: -40° to +419°
The temperature of the oil in the bottom of the oil pan.
Oxygen Sensor (mV) Range: 0 to 1200 mVolts
Displayed in millivolts. A low reading (less than 500 mV) indicates a high
oxygen level in the exhaust stream and a lean exhaust. Some engines
have separate sensors for the left and right exhaust manifolds.
Park/Neutral (Yes / No)
This display indicates whether or not the transmission is in Park or Neutral.
Power Str Press (Volts) Range: 0 to 25 Volts
The power steering pressure switch is an input that allows the ECM to
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GM OPERATIONAL DATA ITEMS
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