EVAP Data

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.

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.

Fuel Level - Range (%): The scan tool will display the remaining percentage of fuel left in the fuel tank.

Fuel Level Sensor - (0.0 - 2.9 Volts): The scan tool will display the voltage coming from the Fuel Level Sensor which will vary from 0.39 volts to 2.9 volts.

Fuel Tank Pressure - (In. H20): Tank pressure will be shown on the scan tool which also is used in determining the correct fuel level inside the fuel tank.

Weak Vacuum Test - (Not Run/Fail): The scan tool will show the status of the diagnostic test.

Small Leak Test - (Not Run/Fail): The scan tool will show the status of the diagnostic test.

Purge Leak Test - (Not Run/Fail): The scan tool will show the status of the diagnostic test.

Excess Vacuum Test - (Not Run/Fail): The scan tool will show the status of the diagnostic test.

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.

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

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

Engine Run Time - Range (0:00:001 - 8:12:15) 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.