Engine Data
ENGINE COOLANT TEMPERATURE RANGE: -40°C - 120°C I-40°F - 250°FThe Engine Coolant Temperature (ECT) sensor is a thermistor (a variable resistor that changes with temperature) in series with a fixed resistor in the Powertrain Control Module (PCM). The PCM provides a 5 volt reference voltage to the ECT sensor. The PCM reads the voltage across the ECT sensor and calculates this voltage reading into a temperature reading. A low voltage reading at the PCM indicates a hot engine and a high voltage reading at the PCM indicates a cold engine.
INTAKE AIR TEMPERATURE RANGE: -40°C to 120°C1-40°F to 250°F
The Intake Air Temperature (IAT) sensor is a thermistor (a variable resistor that changes with temperature) in series with a fixed resistor in the Powertrain Control Module (PCM). The PCM provides a 5 volt reference voltage to the IAT sensor. The PCM reads the voltage across the IAT sensor and calculates this voltage reading into a temperature reading to control the air/fuel mixture and spark timing. A low voltage reading at the PCM indicates that the intake air is warm and a high voltage reading at the PCM indicates that the intake air is cold.
DESIRED IDLE SPEED:
The desired Idle Speed is a PCM internal parameter which indicates the PCM requested idle. If the engine is not running, this number is not valid.
CLOSED THROTTLE POSITION SWITCH:
This parameter will read "ON" when the ISC motor plunger contacts with throttle, or "OFF" when it is apart from the throttle lever.
IAC FLOW DUTY:
The parameter indicates the opening of the throttle valve in terms of percentage to opening controllable by the ISC motor.
ENGINE SPEED - RANGE: 0- 9999 RPM
Engine speed is calculated by the Powertrain Control Module (PCM) from the ignition reference pulses it receives from the Camshaft Position (CMP) sensor. The PCM will keep this value close to the desired idle under various engine loads with the engine idling.
SHORT TERM FT- RANGE -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 450mV threshold. If the oxygen sensor has mainly been below 450mV, 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 -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 0% indicates that fuel delivery requires no compensation to maintain a 14.7:1 air/fuel ratio. A value below 0% means that the fuel system is too rich and fuel delivery is being reduced. A value above 0% indicates that a lean condition exists and the PCM is compensating.
SPARK ADVANCE - RANGE: -1° TO -60°
This displays the Powertrain Control Module (PCM) controlled value that is being used to control the spark timing.
BATTERY VOLTAGE:
This parameter indicates battery positive voltage inputted from the Main Relay to the PCM.
FUEL INJECTION PWM:
This parameter indicates the time of the injector valve opening.
THROTTLE ANGLE - RANGE: 0° TO 90°
The throttle angle parameter displays the throttle position in degrees. The Scan tool will display about "7" to "13" when the throttle valve is fully closed, and will display about "80" when the throttle valve is fully opened.
TP SENSOR - RANGE: 0-5 VOLTS
The throttle position sensor reading provides throttle valve opening information in the form of volts.
HO2S SENSOR 1 - RANGE: 0 - 1275 MV
The Heated Oxygen Sensor (HO2S) is the primary input to the fuel delivery system. The Powertrain Control Module (PCM) monitors the (HO2S) voltage, when the system is in "Closed Loop" operation. When the voltage reading is high, the air/fuel mixture is rich, and when the voltage reading is low the air/fuel mixture is lean. Under normal operating conditions, the voltage reading should constantly fluctuate.
HO2S SENSOR 2 - RANGE: 0-1275MV
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 1OOmV (lean exhaust) and 9OOmV (rich exhaust) when the system is operating in "Closed Loop."
LOOP STATUS - RANGE:- SCAN TOOL DISPLAYS "CLOSED LOOP" OR "OPEN LOOP"
The scan tool displays "Closed Loop" when the system enters closed loop operation. This indicates that the Heated Oxygen Sensor (HO2S) sensor 1 is hot enough for the Powertrain Control Module (PCM) to control fuel delivery. When the scan tool displays "Open Loop" the system is in open loop operation. This indicates that the HO2S sensor 1 is cold and the PCM bases fuel delivery on throttle position and map.
ENGINE LOAD - RANGE 0-100%
Indicates engine load based on manifold absolute pressure. The higher the percentage, the more load the engine is under.
TOTAL FUEL TRIM:
The value of Total Fuel Trim is obtained by shifting values of short term fuel trim and long term fuel trim. Together This value indicates how much correction is necessary to keep the air/fuel mixture stoichiometrical.
FUEL CUT:
When the fuel is being cut (output signal to the injector is stopped) the parameter should read "ON," but when fuel is not in the cut-off mode the parameter should read "OFF."
EVAP PURGE FLOW DUTY:
This parameter indicates the valve "ON" (valve open) time rate within a certain set cycle of EVAP canister purge valve which controls the amount of EVAP purge. 0% means that the purge valve is completely closed while 100% is a fully open valve.
FUEL TANK PRESSURE:
This parameter indicates the pressure in the fuel tank expressed with respect to the barometric pressure. When it is equal to the barometric pressure, it is indicated as 0 mmHg.
MAP - RANGE: 0 - 125 kPa- 5.10 V
The Manifold Absolute Pressure (MAP) sensor measures the change in the intake manifold pressure. This change in pressure, that results from engine load and RPM changes, is converted into a voltage reading that is monitored by the Powertrain Control Module (PCM). A low voltage reading at the PCM indicates low manifold pressure, and a high voltage reading at the PCM indicates high manifold pressure.
VEHICLE SPEED - RANGE: 0-200 km/h 0-125 MPH
This parameter displays the vehicle speed. The Powertrain Control Module (PCM) receives reference pulses from the Vehicle Speed Sensor (VSS) and converts them into km/h and MPH for display.
PNP Switch
This parameter indicates the position in which the gear selector is in.
FUEL TANK LEVEL
This parameter indicates approximate fuel level in the fuel tank. As the detectable range of the fuel level sensor is set as 0 to 100%, however, with some models whose fuel tank capacity is smaller, the indicated fuel level may be only 70% even when the fuel tank is full.