Engine 2 Data

Engine 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.

Desire Idle Speed - 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.

IAC Position - Range (0-255 Counts): 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.

Desired IAC Position- Range (0-255 Counts): The desired IAC indicates the desired IAC position.

Throttle Position (TP) Sensor - Range (0.0-5.0 Volts): The VCM uses the Throttle Position in order to determine the amount of throttle demanded by the operator of the vehicle. The TP sensor reads between 0.36-0.96 volts at idle to above 4.0 volts at Wide Open Throttle (WOT).

TP Angle - Range (0-100%): The VCM computes the TP Angle from the TP signal voltage input. The TP Angle should read 0% at idle. IAT 0%, the TP voltage will read below 0.90 volts. The TP Angle should read 100% at Wide Open Throttle.

Start Up ECT - Range -40°-215°C (-40°-419°F): 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.

ECT - Range -40°-215°C (-40°-419°F): 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.

ECT Sensor - Range (0.0-5.0 Volts): 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 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.

IAT Sensor - 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.

Manifold Absolute Pressure (MAP) Sensor - Range (0.0-5.0 Volts): The MAP sensor produces a low signal voltage when the manifold pressure is low. A low manifold pressure means a high vacuum. The MAP sensor produces a high signal voltage when the manifold pressure is high. A high manifold pressure means a low vacuum. With the ignition ON and the engine stopped, the manifold pressure equals the atmospheric pressure causing the signal voltage to be high. The VCM uses this information as an indication of the vehicle's altitude. This information is referred to as the BARO. Comparison of this BARO reading with a known good vehicle with the same sensor is a good way to check accuracy of a suspect sensor. The readings should read the same +0.4 volt.

Manifold Absolute Pressure (MAP) - Range (10 kPa-104 kPa): The Manifold Absolute Pressure (MAP) sensor measures the change in the intake manifold pressure from the engine load and the speed changes. As the intake manifold pressure increases, the air density in the intake manifold also increases. Additional fuel is required.

Barometric Pressure (BARO) - Range (0.0-5.0 Volts): The BARO represents a measurement of the barometric air pressure. This measurement is determined by using the Manifold Air Pressure (MAP) sensor in order to determine the manifold vacuum. Since the barometric air pressure depends on the altitude, the measurement may vary from 100 kPa (sea level) to 60 kPa (14,000 ft).

Barometric Pressure (BARO) Sensor - Range (0 kPa-62 kPa): The VCM determines the displayed BARO reading from the MAP sensor at the ignition ON and the engine OFF and the WOT conditions. The BARO reading displayed represents the barometric pressure. The VCM uses the displayed BARO readings in order to compensate for the altitude differences.

Engine Load - Range (0-100%): The VCM determines the engine load based upon the engine speed and MAF sensor readings. Engine Load increases with any increase in RPM and/or airflow.

MAF - Range 0-512 g/s: The VCM converts the Mass Air Flow sensor input signal into grams per second. The MAF indicates the amount of air entering the engine.

MAF Frequency (Hertz): The VCM converts the Mass Air Flow sensor input signal into grams per second or hertz. The MAF indicates the amount of air entering the engine.

Power Enrichment - Range (Yes/No): The Power Enrichment indicates if the Power Enrichment mode is active.

Inj. PWM Avg. Bank 1 - Range (0-499 ms): The Inj. Avg. Bank 1 indicates the injector on time that the VCM is commanding.

Inj. PWM Avg. Bank 2 - Range (0-499 ms): The Inj. Avg. Bank 2 indicates the injector on time that the VCM is commanding.

[1][2]EVAP Duty Cycle - Range (0-100%): The scan tool indicates the EVAP duty cycle that the VCM is commanding The EVAP duty cycle is a pulse modulated signal which is translated into a direct percentage of the maximum commandable state.

EVAP Canister Purge - OFF/ON: The EVAP Canister Purge pulls a small vacuum on the entire evaporative emission system. The scan tool displays if the EVAP Canister Purge Solenoid Valve is currently OFF or ON. When the scan tool displays ON, the small vacuum is being applied.

[1][2]EVAP Vent Solenoid - (Closed/Open): The scan tool will show the status of the EVAP Vent Solenoid.

EGR Duty Cycle - (0%-100%): The EGR Duty Cycle determines a percentage of time the valve is being opened and closed.

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.

Rich/Lean Bn 1 - (Rich/Lean): The Rich/Lean Bn 1 indicates the condition of the exhaust gases in bank 1.

Rich/Lean Bn 2 - (Rich/Lean): The Rich/Lean Bn 2 indicates the condition of the exhaust gases in bank 2.

CL Since Restart - Range (Yes/No): The Closed Loop Since Restart indicates whether or not the vehicle has been in a closed loop state.

Fuel Trim Enable - Range (Yes/No): The Fuel Trim Enable indicates the state of the fuel trim (Enable/Disabled) that the VCM is commanding. Fuel trim will be disabled when the vehicle is not in closed loop, malfunction codes related to fuel trim are set, large amounts of purge vapor are injested by the engine, or additional diagnostics that temporarily affect fuel trim operation are active.

VTD Fuel Disable - Range (Active/Inactive): If the VCM has not received the correct password from the PASSLOCK Module or Body Control Module (if equipped), the VCM will disable fuel to the fuel system. If this occurs, the scan tool will display Active.

VTD Auto Learn Timer - Range (Active/Inactive): The Auto Learn Timer will indicate if the Vehicle Theft Deterrent (VTD) system is in the learn mode and has not timed out (approx 10 minutes).

PCM/VCM in VTD Fail - Range (Yes/No): This will indicate when the VCM has received a good password from the PASSLOCK Module or Body Control Module (if equipped), the vehicle has started, and a failure has occurred. The VCM will continue to enable fuel.

VTD Fuel Disable Until - Range (Yes/No): With the ignition ON and a VTD code stored, the scan tool will display Yes.

Ignition 1 - Range (0.0-25.5 Volts): The Ignition 1 indicates the voltage of the ignition input to the VCM.

Ignition 1 On - Range (Yes/No): The Ignition 1 On indicates the presence of a valid ignition 1 signal. The normal ignition 1 voltage is approximately 13.8 volts, but may vary between 11 and 16 volts. The VCM monitors the ignition 1 voltage to compensate for low voltage operation of the injectors and to increase dwell time of the ignition timing signal to the distributor.

Ignition 1 Low - Range (Yes/No): The scan tool indicates whether a low ignition voltage has been detected. A low ignition 1 voltage may degrade ignition timing and injector operation. The normal ignition 1 voltage is approximately 13.8 volts, but may vary between 11 and 16 volts.

Ignition 1 High - Range (Yes/No): The scan tool indicates whether a high ignition voltage has been detected. An excessively high ignition 1 voltage could damage hardware. The normal ignition 1 voltage is approximately 13.8 volts, but may vary between 11 and 16 volts.

A/C Request - Range (Yes/No): The scan tool indicates the state of the A/C request input circuit. The VCM uses the A/C request signal in order to determine whether A/C compressor operation has been requested.

A/C Relay - Range (Yes/No): The scan tool indicates whether the A/C relay control circuit has been commanded ON.

A/C Evaporator Switch - Range (Open/Closed): The A/C Evaporator Switch is used to indicate to the VCM if the A/C clutch should be enabled or disabled. The switch is opened when the compressor is between approximately 22-45.5 psi.

A/C Sec. High Pres. Switch - Range (Open/Closed): The switch notifies the VCM when the compressor pressure limit is approached. The switch closes at a high pressure value which is calibrated for specific platforms. The VCM monitors the secondary high pressure switch at least every 100 ms.

Auto Recirculation - Range (ON/OFF): The Auto Recirculation mode will be commanded ON when an A/C high pressure is detected, vehicle speed falls below a calibrated speed, and the engine is ON. The VCM monitors the auto recirculation switch at least every 100 ms.

Fuel Level - Range (0-100%): The scan tool indicates the current percentage of fuel tank occupancy. The float position changes the value of a variable resistor who's voltage the VCM converts to the displayed percentage.

4WD - Range (Enable/Disable): The scan tool indicates the state of the transfer case.

4WD Low - Range (Enable/Disable): The scan tool displays the state of the 4WD Low gear.

Brake Switch - Range (Open/Closed): The Brake Switch indicates the status of the brake switch.

TR Switch: 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.

Clutch Switch - Range (ON/OFF): The scan tool indicates the current clutch switch state. When the clutch pedal is depressed the cruise control is disabled.

Vehicle Speed- Km/h - Range (0-255): The MPH - km/h indicates in MPH and in km/h how fast the drive wheels are turning.

1-2 Solenoid - Range (ON/OFF): The scan tool indicates whether the automatic transmission's shift solenoid is active.

2-3 Solenoid - Range (ON/OFF): The scan tool indicates whether the automatic transmission's shift solenoid is active.

3-2 Downshift Solenoid - Range (ON/OFF): The scan tool indicates whether the automatic transmission's shift solenoid is active.

TCC Enable - Range (Yes/No): The scan tool indicates whether or not the VCM commanded the TCC enable solenoid to an active state.

TCC Duty Cycle - Range (0-100%): The scan tool indicates the amount that the VCM commands the TCC ON. The TCC solenoid is pulse modulated to provide a determined amount of pressure, which is translated into a percentage of the supply pressure. An open solenoid circuit would cause the duty cycle to be fixed at maximum.

Cruise - Range (Enable/Disable): The Cruise Mode indicates if the driver has requested the cruise control.

Decel Fuel Mode - Range (Active/Inactive): The scan tool indicates whether the vehicle is in fuel cutoff mode.

Mileage Since DTC Clear - Range (Km/Mi): The scan tool indicates the total distance the vehicle has traveled since the DTCs were cleared.

DTC Set this Ignition - Range (Yes/No): The scan tool indicates whether or not any DTC has set during the current ignition cycle.

Engine Run Time - Range (0:00:00-18:12:15) 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.