Engine 1 Data

Engine Speed - Range 0 - 16384 RPM: Engine Speed is computed by the PCM from the fuel control reference input. It should remain close to desired idle under the various engine loads with the engine idling.

Desired Idle - 0 - 3187 RPM: The PCM commands the idle speed. The PCM compensates for various engine loads in order to maintain the desired idle speed. The actual RPM's engine speed should remain close to the desired idle under the various engine loads with the engine idling.

ECT - Range -40°C - 151°C (-40°F - 304°F): The Engine Coolant Temperature (ECT) sensor sends engine temperature information to the PCM. The PCM supplies 5 volts to the engine coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the PCM monitors a high voltage which it interprets as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal will decrease and the PCM will interpret the lower voltage as a warm engine.

IAT - Range -40°C - 151°C (-40°F - 304°F): The PCM converts the resistance of the Intake Air Temperature (IAT) sensor to degrees in the same manner as the ECT sensor. Intake air temp is used by the PCM to adjust fuel delivery and spark timing according to incoming air density.

MAP - Range 11 - 105 kPa, 0 - 5.0 Volts: The Manifold Absolute Pressure (MAP) sensor measures the change in the intake manifold pressure which results from engine load and speed changes. As the intake manifold pressure increases, the air density in the intake also increases and additional fuel is required.

BARO - Range 11 - 105 kPa, 0 - 5.0 Volts: The Barometric Pressure (BARO) sensor measures the change in the intake manifold pressure which results from altitude changes. This value is updated at ignition ON and also at Wide Open Throttle (WOT).

TP Sensor - Range 0.0 - 5 Volts: The PCM uses the Throttle Position (TP) sensor to determine the amount of the throttle demanded by the operator of the vehicle. The TP sensor reads between 0.3 - .96 volt at idle to above 4.0 volts at Wide Open Throttle (WOT).

TP Angle - Range 0 - 100%: The PCM computes the Throttle Position (TP) from the TP sensor voltage input. The TP angle will auto zero to 0% at idle when the TP voltage is below 0.90 volt. The TP angle will read 100% at Wide Open Throttle (WOT).

02S 1 - Range 0 - 1132 mV: The Oxygen Sensor (O2S 1) reading 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 a Closed Loop.

HO2S 2 - Range 0 - 1132 mV: The Rear Heated Oxygen Sensor (HO2S 2) represents the exhaust oxygen output voltage past the catalytic converter. This voltage remains inactive, or the voltage will appear lazy within a range of 100 mV (lean exhaust) and 900 mV (rich exhaust) when the system is operating in a Closed Loop.

Fuel Trim Cell - Range 0 - 22: A Fuel Trim Cell depends upon the engine speed and the MAP sensor readings. RPM vs. MAP is broken down into 22 fuel trim cells. The 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 to fuel delivery by the PCM in response to the amount of time the oxygen sensor voltage spends above or below the 450 mV threshold. If the oxygen sensor 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%): The Long Term Fuel Trim (FT) is derived from the short term fuel trim value. The Long Term Fuel Trim (FT) is used for the long term correction of the fuel delivery. A value of the 128 counts (0%) indicates that the fuel delivery requires no compensation in order to maintain a 14.7:1 air to fuel ratio. A value below 128 counts means that the fuel system is too rich and the fuel delivery is being reduced. The PCM is decreasing the injector pulse width. A value above 128 counts indicates that a lean condition exists for which the PCM is compensating.

Short Term FT - Average - Range 0 - 255 (-100% to 100%): The Short Term Fuel Trim (F--) Average is derived from the short term fuel trim from all of the cells. The PCM takes all of the values. The PCM then creates one average value.

Long Term FT - Average - Range 0 - 255 (-100% to 100%): The Long Term Fuel Trim (F--) Average is derived from the long term fuel trim from all of the cells. The PCM takes all of the values. The PCM then creates one average value.

Spark - Range 64 to - 64 degrees: This is a display of the spark advance (IC) calculation which the PCM is programming in the ignition system. It computes the desired spark advance using data such as engine temperature, RPM, engine load, vehicle speed and operating mode.

Adaptive Knock Retard - Range 0 - 90 degrees: The Adaptive Knock Retard indicates the long term amount of the spark advance the PCM removes from the ignition control (IC). The PCM responds to the Knock Sensor (KS) signal.

KS Retard - 0 - 90 degrees: The Knock Sensor (KS) retard indicates the amount of spark advance (IC) the PCM is removing from in response to the Knock Sensor (KS) signal.

KS Noise Channel - Range Yes/No: The KS Noise Channel indicates when the PCM detects the Knock Sensor (KS) signal. The PCM should display No at idle.

Med. Resolution Resync Counter - Range 0 - 255 Count: The medium resolution resync counter displays the number of times the PCM had to resync the Crankshaft Position (CKP) sensor. The Med. Resolution Resync Counter is helpful in diagnosing the DTC P0335.

CKP Act Counter - Range 0 - 255 Counts: The Crankshaft Position (CKP) activity counter displays whether the PCM is receiving the 7X sync pulses from the ignition module. Helpful in diagnosing DTC P0335 and Cranks But Will Not Run conditions. CMP Act. Counter - Range 0255 Counts: The Camshaft Position (CM P) activity counter displays the activity sent to the PCM from the CMP sensor. The counter will continually increment while the engine is running. The CMP Act. Counter is helpful in diagnosing the DTC P0342.

Med. Resolution Engine Sync. - Range YES/NO: The medium resolution engine sync. displays if the PCM is receiving the 7x sync pulse. The Med. Resolution Engine Sync. is helpful in diagnosing the DTC P0300 and P0301-P0304.

CMP Re sync 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. The CMP Resync Counter is helpful in diagnosing the DTC P0341.

Purge Lrn. Mom. - Range 0.00 - 1.00: The purge learn memory is a display of the PCM adding or subtracting the fuel. The purge learn memory is based on the EVAP Purge. This number is added to the fuel trim calculations. The fuel is added or subtracted there. A number near 1 indicates that the fuel is being added to the fuel trim. A number near 0 indicates that fuel is being taken away from the fuel trim.

EVAP Canister Purge - Range 0 - 100%: The Evaporative Emission (EVAP) purge valve solenoid is a proportional signal used in order to control the evaporative emission canister purge function. At 0% the valve is commanded fully closed. 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 read, the greater the commanded idle speed is. The idle air control responds fairly quickly to changes in the engine load in order to maintain the desired idle RPM.

Trans. Range - Range Park/Reverse/Neutral/Overdrive/Drive 3/Drive 2/Low/Invalid : The scan tool displays the decoded position of the transmission range switch PRNDL inputs. This information is then sent by UART serial data to the Instrument Panel Cluster (IPC) to be displayed to the operator on the IPC. If a valid combination of inputs is not seen by the PCM, Invalid will be displayed.

Engine Speed - Range 0 - 16384 RPM: Engine Speed is computed by the PCM from the fuel control reference input. It should remain close to desired idle under various engine loads with the engine idling.

ECT - Range -40° - 151°C (-40°F - 304°): The Engine Coolant Temperature (ECT) sensor sends engine temperature information to the PCM. The PCM supplies 5 volts to the engine coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the PCM monitors a high voltage which it interprets as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal will decrease and the PCM will interpret the lower voltage as a warm engine.

Vehicle Speed - 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, cruise control module and multi-function alarm module use the 4000 ppm output.

FC Relay - Range Off/On: The Fan Control (FC) relay is commanded by the PCM. FC relay displays the command as On or OFF.

Ignition 1- Range 0 - 25.5 volts: The ignition volts represents the system voltage measured by the PCM at the ignition feed circuit.

Loop Status - Range Open/Closed: A Closed Loop displayed indicates that the PCM is controlling the fuel delivery according to the Oxygen Sensor (O2S 1) voltage. The PCM controls the fuel delivery air to fuel ratio as close to 14.7:1 as possible.

GEN F PWM Range 0 - 100%: The generator F terminal is the duty cycle or load input to the PCM from the generator. As the generator load increases, the PCM will adjust idle speed accordingly.

GEN L Terminal - Range Inactive/Active: The generator L terminal indicates whether the PCM is allowing the generator to operate. The PCM can disable the generator under certain conditions to ease starting. Inactive indicates that the PCM is allowing generator operation, while active indicates that the PCM is not allowing generator operation. TCC Brake Switch - Range Off/On: When the brake pedal is applied, the Torque Converter Clutch (TCC) brake switch sends a signal to the PCM to disengage the TCC and disable cruise control. Power Enrichment - Range Off/On: The scan tool indicates when power enrichment mode is active (moderate to heavy acceleration). Helpful in diagnosing DTC P1171.

Calc. Air Flow - Range 0 - 512 grams/second: The calculated air flow is a calculation based on manifold absolute pressure. The calculation is used in several diagnostics to determine when to run.

LOAD - Range 0 - 100%: Indicates engine load based on manifold absolute pressure. The higher the percentage, the more load the engine is under.

# of Curr. DTCs - Range 0 - 255: The # of Curr. DTCs indicates the total number of current Diagnostic Trouble Codes (DTCs) set. These current DTCs set does not necessarily mean that the Malfunction Indicator Lamp (MIL) is illuminated.

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 been running. When the engine stops running, the timer resets to zero.