Misfire Data

ENGINE SPEED - RANGe 0-16384:
From the fuel control reference input, the PCM computes the Engine Speed. The engine speed should remain close to the desired idle under the various engine loads with the engine idling.

DESIRED IDLE - RANGE 0-3187 RPM:
The PCM commands the idle speed. The PCM compensates for the various engine loads in order to keep the engine at the desired idle speed.

ECT - RANGE -40°C-151°C (-40°F-304°F):
The Engine Coolant Temperature (ECT) sensor sends the engine temperature information to the PCM. The PCM supplies 5 volts to the engine coolant temperature sensor circuit. The sensor is a thermistor. The thermistor the internal resistance as the temperature changes. When the sensor is cold indicating the internal resistance is high, the PCM monitors a high voltage. The PCM interprets as a cold engine. As the sensor warms indicating that the internal resistance is decreasing, the voltage signal decreases. The PCM interprets the lower voltage as a warm engine.

IAT - RANGE -40°C-151°C (-40°F-304°F):
The PCM converts the resistance of the Intake Air Temperature (IAT) sensor to degrees in the same mode as the ECT sensor. The PCM muses the intake air temperature in order to adjust the fuel delivery and the spark timing according to the incoming air density.

MAP - RANGE 11-105 KPA, 0.0-5.0 VOLTS:
The Manifold Absolute Pressure (MAP) sensor measures the change in the intake manifold pressure. The change in the intake manifold pressure results from engine load changes and speed changes. As the intake manifold pressure increases, the air density in the intake also increases. 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 the altitude changes. The BARO updates when the ignition is turned ON and at Wide Open Throttle (WOT).

TP SENSOR - RANGE 0.0-5.0 VOLTS:
The PCM uses the Throttle Position (TP) sensor in order to determine the amount of the throttle demanded by the vehicle's operator. The TP sensor reads between 0.360.96 volt at idle to above 4 volts at Wide Open Throttle (WOT).

TP ANGLE - RANGE 0-100%:
The PCM computes the Throttle Position (TP) angle from the TP sensor voltage input. The TP angle will auto zero to 0% at idle. The TP voltage will read below 0.90 volt. The TP angle will read 100 % at Wide Open Throttle (WOT).

MISFIRE CUR. #1-4 - RANGE 0-255 COUNTS:
Indicates the number of current misfires that are present in the indicated cylinder. Increments only when misfire is current.

MISFIRE HIST. #1-4 - 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 1 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. Increments only after a misfire DTC has been set.

BASE PWM CYL. 1-4 - RANGE 0-999.9 MS:
Indicates the base Pulse Width Modulation (PWM) or ON time of the indicated cylinder injector in milliseconds. When the engine load is increased, the injector pulse width will increase.

CALCULATED AIR FLOW - RANGE 0-512 GM/SEC:
The calculated air flow is a calculation base on the manifold absolute pressure. The calculation is used in several diagnostics in order to determine when to run.

LOAD - RANGE 0-100%:
The LOAD indicates the engine load based on the manifold absolute pressure. The higher the percentage, the more load the engine is under.

TOTAL MISFIRE - RANGE 0-255 COUNTS:
The Total Misfire indicates the total number of misfires that have been detected in all cylinders after 100 engine cycles. One cycle equals the completion of a 4 stroke cycle. The total misfire only increments during a 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.