Engine 3 Data
Engine 3 Data DefinitionsEngine Speed - Range 0-16384 RPM: The VCM computes the Engine Speed from the fuel control reference input. The speed should remain close to the desired idle under the various engines loads with the engine idling.
Desired Idle - Range 0-3187 RPM: The VCM commands the desired IAC. The VCM compensates for various engine loads in order to maintain the desired idle speed.
EVAP Duty Cycle - Range (0-100%): The EVAP Duty Cycle indicates the EGR duty cycle that the VCM is commanding.
Air/Fuel Ratio - Range (0.0:1-25.5:1): The Air/Fuel Ratio indicates the calculated air to fuel ratio that the VCM is commanding.
Actual EGR Position - Range (0-100%): The Actual EGR Position indicates the actual EGR position in a percentage.
Desired EGR Position - Range (0-199.9%): The Desired EGR Position indicates the desired EGR position in a percentage.
EGR Sensor - Range (0.00-5.00 volts): The EGR Sensor indicates the actual EGR position in voltage. IAC Position - Range (0-255): The scan tool displays in counts the Idle Air Control (IAC) pintle position commanded from the VCM. The greater the number of counts, the greater the command idle speed (air passages opened) is. The idle air control should respond fairly quickly to changes in the engine load in order to maintain the desired idle RPM.
ECT - Range -40°-215°C (-4O°-419°C): The Engine Coolant Temperature (ECT) sensor is mounted in the intake the intake manifold. The ECT sends the engine temperature information to the VCM. The VCM supplies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes the internal resistance as the temperature changes. When the sensor is cold meaning the internal resistance is high, the VCM monitors a high voltage signal. The VCM interprets the high voltage signal as a cold engine. As the sensor warms meaning the internal resistance decreases, the voltage signal decreases. The VCM interprets the lower resistance as a warm engine.
Start Up ECT - Range -40°-215°C (-4O°-419°C): When the engine is started, the VCM records the engine coolant temperature. The VCM uses the recorded temperature in order to calculate the time to a Closed Loop.
Ignition 1 - Range (0.0-25.5:1): The Ignition 1 indicates the condition of the ignition input to the VCM.
IAT - Range (-40°-151°C): The VCM converts the resistance of the Intake Air Temperature (IAT) sensor to degrees. The VCM uses the intake air temperature in order to adjust the fuel delivery and the spark timing according to the incoming air density.
Trans. Range: The Trans. Range indicates the current drive gear.
A/B/C Range - Range (On/Off): The A/B/C Range indicates the current state of the transmission range switch.
Cruise Mode - Range (Yes/No): The Cruise Mode indicates if the driver has requested the cruise control.
TCC Enable - Range (Yes/No): The TCC Enable indicates the status of the TCC enable output.
MPH - km/h - Range (0-255): The MPH - km/h indicates in MPH and in km/h how fast the drive wheels are turning.
Brake Switch - Range (Open/Closed): The Brake Switch indicates the status of the brake switch. Decel Fuel Mode - Range (Yes/No): The Decel Fuel Mode indicates if the VCM is in a Decel Fuel Mode. Spark Control - Range (Advance/Retard): The Spark Control indicates if the VCM is commanding the spark advance or the spark retard.
Cam Retard - Range (2039-2040): The Cam Retard indicates the amount of the Camshaft Position sensor to the Crankshaft Position sensor off set.
4 WD - Range (Yes/No): The 4 WD indicates if the 4 wheel drive is active.
4 WD Low - Range (Yes/No): The 4 WD Low indicates if the 4 wheel drive low is active.
Ignition 1 On - Range (Yes/No) : The Ignition 1 On indicates the condition of the ignition input to the VCM.
Ignition 1 Low - Range (Yes/No): The Ignition 1 Low indicates the condition of the ignition input to the VCM.
Ignition 1 High - Range (Yes/No): The Ignition 1 High indicates the conditions of the ignition input to the VCM.
Power Enrichment - Range (Yes/No): The Power Enrichment indicates if the Power Enrichment mode is active.
A/C Status - Range (Yes/No): The A/C Status indicates the status of the A/C system to the VCM.
A/C Request On - Range (Yes/No): The A/C Request On indicates if the driver has requested the A/C.
A/C Relay - Range (Yes/No): The A/C Relay indicates the state of the A/C relay control circuit.
A/C Engaged - Range (Yes/No): The A/C Engaged indicates it the A/C is engaged when the VCM commands the A/C on.
DTC Counter - Range (0-255): The DTC counter indicates the total number of current Diagnostic Trouble Codes (DTCs) set. This does not necessarily mean that the Malfunction Indicator Lamp (MIL) is illuminated.
Engine Run Time - Range (0:00:OO-18:12:15) Hours: Minutes: Seconds: The Engine Run Time is a measure of how long the engine has run during this ignition cycle. When the engine stops running, the timer resets to zero.