Engine 1 Data
Engine 1 DataScan Tool Data - Engine 1 Idle/Upper Radiator Hose Hot/Closed throttle/Park or Neutral/"Closed Loop"/ACC. "OFF"(1 Of 2):
Scan Tool Data - Engine 1 Idle/Upper Radiator Hose Hot/Closed throttle/Park or Neutral/"Closed Loop"/ACC. "OFF"(2 Of 2):
Engine Speed - Range 0-16384 RPM
Engine Speed is computed by the Powertrain Control Module (PCM) from the fuel control reference input.
Desired Idle - Range 0-3187 RPM
The idle speed is commanded by the PCM. The PCM compensates for various engine loads to maintain the engine at the desired idle speed. Actual RPM's should remain close to desired idle under various engine loads with the engine idling.
ECT - Range -4O°C to 215°C (-40°F to 419°F)
The Engine Coolant Temperature (ECT) sensor sends a signal to the PCM relative to engine coolant temperature. The PCM then converts this signal to degrees Celsius. Engine coolant temperature is used by the PCM to adjust fuel delivery and spark timing.
IAT - Range -4O°C to 215°C (-4O°F to 419°F)
The Intake Air Temperature (IAT) sensor sends a signal to the PCM relative to the intake incoming air. The PCM converts the signal of the IAT sensor to degrees Celsius. Intake air temperature is used by the PCM to adjust fuel delivery and spark timing.
MAP - Range 11-105 kPa, 0-5.0 Volts
The Manifold Absolute Pressure (MAP) sensor measures intake manifold pressure. Manifold pressure changes with engine speed and engine load. Manifold absolute pressure is used by the PCM to adjust fuel delivery and spark timing.
BARO - Range 11-105 kPa, 0-5.0 Volts
Barometric (BARO) pressure is read from the MAP sensor when the ignition is "ON" and the engine is "OFF" and also at wide open throttle. BARO is used by the PCM to adjust fuel delivery and spark control due to altitude changes.
TP Sensor - Range 0-5.0 Volts
The Throttle Position (TP) sensor is used by the PCM to determine the amount of throttle demanded by the operator of the vehicle. The TP sensor will read between 0.36-0.96 volt at idle to above 4 volts at Wide Open Throttle (WOT).
TP Angle - Range 0-100%
Throttle Position (TP) angle is computed by the PCM from the TP sensor voltage input. The TP angle will auto zero to 0% at idle (TP voltage below .90 volt) and read 100% at Wide Open throttle (WOT).
O2S 1 - Range 0-1132 mV
This represents the exhaust oxygen sensor output voltage. This voltage will fluctuate constantly between 100 mV (lean exhaust) to 900 mV (rich exhaust) when operating in "Closed Loop".
HO2S 2- Range 0-1132 mV
The Rear Heated Oxygen Sensor (HO2S 2) represents the exhaust oxygen output voltage beyond the catalytic converter. This voltage will remain inactive or appear lazy within a range of 100 mV (lean exhaust) and 900 mV (rich exhaust) when the system is operating in "Closed Loop".
Fuel Trim Cell - Range 0-22
A Fuel Trim Cell is dependent upon engine speed and MAP sensor readings. A plot of RPM vs. MAP is broken down into 22 fuel trim cells. Fuel Trim Cell indicates which cell is currently active.
FT Index - Range 0-255 (-100% to 100%)
Fuel Trim (FT) Index represents the average Long Term Fuel Trim for certain cells which are used in determining DTC P0171 and P0172.
Short Term FT - Range 0-255 (-100% to 100%)
Short Term Fuel Trim (FT) represents a short term correction of fuel delivery in response to the amount of time the oxygen sensor voltage is above or below 450 mV. If the oxygen sensor voltage has mainly been below 450 mV, indicating a lean air/fuel mixture, short term fuel trim will increase to tell the PCM to add fuel. If the oxygen sensor voltage stays mainly above the threshold, the PCM will reduce fuel delivery to compensate for the indicated rich condition.
Long Term FT - Range 0-255 (-100% to 100%)
Long Term Fuel Trim (FT) is derived from the short term fuel trim value and is used for long term correction of fuel delivery. A value of 128 counts (0%) indicates that fuel delivery requires no compensation to maintain a 14.7:1 air/fuel ratio. A value below 128 counts means that the fuel system is too rich and fuel delivery is being reduced (decreased injector pulse width). A value above 128 counts indicates that a lean condition exists and the PCM is compensating.
Short Term FT Average - Range 0-255 (-100% to 100%)
Short Term Fuel Trim (FT) Average is derived from the short term fuel trim from all of the cells. The PCM then takes all of the values and then creates one average value.
Long Term FT Average - Range 0-255 (-100% to 100%)
Long Term Fuel Trim (FT) Average is derived from the long term fuel trim from all of the cells. The PCM then takes all of the values and calculates the average value.
Low Octane Fuel Spark Modifier - Range 0-90 degrees
Indicates the long term amount of spark advance the PCM is removing from the ignition control in response to the Knock Sensor (KS) signal.
Spark - Range - 64 to -64 degrees
Spark is the amount of spark the PCM is programming in the ignition system. The PCM computes the desired spark advance using data such as engine temperature, RPM, engine load, vehicle speed and operating mode.
KS Retard - Range 0-90 degrees
Knock Sensor (KS) retard is the amount of spark advance the PCM is removing from the IC in response to the Knock Sensor (KS) signal.
KS Noise Channel - Range Yes/No
Indicates when the Knock Sensor (KS) signal is being detected by the PCM. Should display "No" at idle.
KS Active- Range 0-255 counts
The Knock Sensor (KS) activity counter indicates if the PCM is receiving the varying frequency output of the Knock sensor (KS). The KS counter increases with engine speed.
Med. Resolution Resync Counter. - Range 0-255 counts
The medium resolution resync counter displays the number of times the PCM had to resync with the Crankshaft Position (CKP) sensor. Helpful in diagnosing DTC P0335.
CKP Act. Counter - Range 0-255 counts
The Crankshaft Position (CKP) activity counter displays the number of 7X resync pulses from the ignition module.
CMP Act. Counter - Range 0-255 counts
The Camshaft Position (CMP) activity counter displays the activity sent to the PCM from the CMP sensor. The counter will continually increment while the engine is running. Helpful in diagnosing DTC P0342.
Med. Resolution Engine Sync. - Range YES/NO
The medium resolution engine sync. displays if the PCM is receiving the 7X sync pulse. Helpful in diagnosing DTCs P0300 and P0301-P0304.
CMP Resync Counter. - Range 0-255 counts
The Camshaft Position (CMP) resync counter displays the number of times the PCM had to resync with the CMP sensor. Helpful in diagnosing DTC P0341.
Purge Lrn. Mem. - Range 0.00-1.00
Purge learn memory is a display of the PCM adding or subtracting fuel, based on EVAP purge. This number is added to fuel trim calculations and fuel is added or subtracted there. A number near "1" indicates that fuel is being added to fuel trim and a number near "0" indicates that fuel is being taken away.
EVAP Sol. - Range 0-100%
The Evaporative Emission (EVAP) purge valve solenoid is a proportional signal used to control the evaporative emission canister purge function. 0% implies the valve is commanded fully closed while 100% implies that the valve is fully open.
IAC Position - Range 0-255 counts
The Idle Air Control (IAC) pintle position command from the PCM is displayed in counts. The higher the counts, the greater the commanded idle speed. Idle air control will respond fairly quickly to changes in engine load to maintain the desired idle RPM.
MPH km/h - Range 0-255 MPH, 0-255 km/h
The vehicle speed sensor signal is converted into MPH (km/h) for display. The vehicle speed output from the PCM is 4000 pulses per mile. The scan tool uses the class 2 serial data from the PCM to obtain vehicle speed, while the instrument panel cluster and multi-function alarm module use the 4000 ppm output.
Ignition Volts - Range 0-25.5 volts
This represents the system voltage measured by the PCM at its ignition feed circuit.
Loop Status - Range Open/Closed
"Closed Loop" is displayed indicating that the PCM is controlling fuel delivery according to the Oxygen Sensor (O2S 1) voltage as close to an air/fuel ratio of 14.7:1 as possible.
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.
# of Curr. DTCs - Range 0-255
Indicates the total number of current Diagnostic Trouble Codes (DTCs) set. Does not necessarily mean the Malfunction Indicator Lamp (MIL) is illuminated.