Misfire Data
Engine Speed - Range 0-16384 RPMEngine Speed is computed by the PCM from the fuel control reference input. It should remain close to desired idle under various engine loads with the engine idling.
Desired Idle - Range 0-3187 RPM
The idle speed that is commanded by the PCM. The PCM will compensate for various engine loads to keep the engine at the desired idle speed.
ECT - Range -40°C- 215°C (-40°F- 419°F)
The Engine Coolant Temperature (ECT) sensor sends engine temperature information to the PCM. The PCM supplies 5 volts to the engine coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the PCM monitors a high voltage which it interprets as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal will decrease and the PCM will interpret the lower voltage as a warm engine.
IAT - Range -40°C- 215°C (-40°F - 419°F)
The PCM converts the resistance of the Intake Air Temperature (IAT) sensor to degrees in the same manner as the ECT sensor. Intake air temp is used by the PCM to adjust fuel delivery and spark timing according to incoming air density.
MAP - Range 11-105 kPa, 0-5.0 Volts
The Manifold Absolute Pressure (MAP) sensor measures the change in the intake manifold pressure which results from engine load and speed changes. As the intake manifold pressure increases, the air density in the intake also increases and additional fuel is required.
BARO - Range 11-105 kPa, 0-5.0 Volts
The Barometric Pressure (BARO) sensor measures the change in the intake manifold pressure which results from altitude changes. This value is updated at ignition "ON" and also at Wide Open Throttle (WOT).
TP Sensor - Range 0-5.0 Volts
The Throttle Position (TP) sensor is used by the PCM to determine the amount of throttle demanded by the operator of the vehicle. The TP sensor will read between 0.36-0.96 volt at idle to above 4 volts at Wide Open Throttle (WOT).
TP Angle - Range 0-100%
Throttle Position (TP) angle is computed by the PCM from the TP sensor voltage input. TP angle will auto zero to 0% at idle (TP voltage below 0.90 volt) and read 100% at Wide Open throttle (WOT).
Misfire Cur. #1 - Range 0-255 counts
Indicates the number of current misfires that are present in cylinder #1. Increments only when misfire is current.
Misfire Hist. #1 - Range 0-255 counts
Indicates the number of misfires that have occurred after 195 current misfires have been counted. The current misfire counter will add it misfires to the history misfire counter after 195 total misfires have taken place. If one cylinder is misfiring, the misfiring current counter will have 195 misfires counted before adding to its history counter. If 2 cylinders are misfiring, the misfiring current counters will add to their history counters after 97 misfires.
Calc. Air Flow - Range 0-512 gm/sec
The calculated air flow is a calculation based on manifold absolute pressure. The calculation is used in several diagnostics to determine when to run.
LOAD - Range 0-100%
Indicates engine load based on manifold absolute pressure. The higher the percentage, the more load the engine is under.
Total Misfire - Range 0-255 counts
Indicates the total number of misfires that have been detected in all cylinders after 100 engine cycles (1 cycle equals the completion of a four stroke cycle). Only increments during steady state cruise conditions.
Engine Run Time - Range 0:00:00-18:12:15
hours:minutes:seconds
A measure of how long the engine has been running. When the engine stops running, the timer is reset to zero.