Engine 3 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.

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.

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

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.

Engine Load - Range (0 - 100%): The Engine Load indicates the engine load based on the Manifold Absolute Pressure. The higher the percentage, the greater the load the engine is under.

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.

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.

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 and 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.

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.

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.

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.

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.).

EVAP Duty Cycle - Range (0 - 100%): The EVAP Duty Cycle indicates the EGR duty cycle that the VCM is commanding.

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.

EGR Sensor - Range (0.00 - 5.00 Volts): The EGR Sensor indicates the actual EGR position in voltage.

CMP Retard - Degrees: The CMP Retard indicates the difference between the CMP sensor and the CKP sensor in degrees.

A/C Request - 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.

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.