I've already posted this in the live data analysis thread, but because it's also relevant to this thread, I thought I'd post it here too, but without the out of range troubleshooting part. I hope it's ok with the mods.
Cheers,
Marvin
EXPLANATIONS & REFERENCE VALUESEngine speedEngine revolutions. Same as the instrument rev counter, only this reading is digital.
Reference: Idle - around 750 RPM, WOT - 4600 RPM
Calculate loadIndication of the amount of load in terms of airflow generated by the engine (not torque or horsepower) during idle, when towing, travelling uphill, accelleration etc. It is not measured by a dedicated sensor, but rather calculated using various parameters. The output is in percentage from the peak airflow. How it is calculated exactly is different for each manufacturer but it might include readings from the MAF, MAP, engine speed, throttle position or intake air temp and pressure sensors.
Reference: Idle - around 16%, WOT - 95% and above (peak airflow)
MAFMAF or mass airflow is the amount of air being sucked (technical term, honest
) into engine measured just after the airfilter. The output is in grams per second.
Reference: 5-12 gm/sec (Idle)
Atmosphere pressure (abs)As the term implies, it is the absolute atmospheric pressure in kiloPascals, measured at ground level. Changes with outside temperature and altitude. Pressure drops by 1 kPa for every 100m rise in altitude. The opposite for drop in altitude.
MAPManifold absolute pressure is the pressure measured inside the manifold just before the EGR where the feed for the sensor is located. The ECU uses these readings to determine EGR flow among others. The output is in kiloPascals.
Reference: 95-105 kPa (Idle)
Initial intake air tempSnapshot of the intake air temperature at the exact moment of engine start. Measured by the sensor incorporated in the MAF meter.
Reference: whatever the temp is at engine start.
Intake airTemperature of the air past the air filter, measured by sensor inside the MAF meter. Output in degrees Celsius
Intake air temp (turbo) Temperature of the air entering the intake manifold (also intercooler air temp), as measured by the sensor at the intercooler outlet. Not to be confused with the intake air temp sensor housed inside the MAF, which is used for different purposes.
Initial engine coolant tempSnapshot of the coolant temperature measured at engine start. The sensor is located just above the waterpump. Output is in degrees Celsius.
Reference: whatever the coolant temp is at engine start
Coolant tempActual coolant temperature with the engine running. Sensor is located just above waterpump. Engine is considered warm when coolant temp is upwards of 86 deg C.
Battery voltageVoltage of either the battery or the charging system (alternator), depending on wether the engine is running or not. Output in Volts.
Reference: Engine off - around 12 Volts (battery), Engine on - around 13.5 Volts (charging)
Accelerator positionPosition of the accelator pedal, calculated in percentages.
Reference: Idle - 0%, WOT - just under 100%
Actual throttle positionPosition of the throttle valve (butterfly) in the intake manifold. Aids in smooth engine shut-off and rate of EGR. Output in %
Reference: Engine off - 0%, Idle - around 80% (open)
Throttle close learning val.The position in which the throttle valve is considered closed by the ECU. Output in degrees (I guess, from the vertical axis of the sensor)
Reference: 17.2 - 17.5 degrees
Injection volumeThe total amount of fuel being injected into the cylinders. Output is in cubic millimeters per stroke.
Reference: 5-12 mm3/st (Idle)
Injection Feedback valueThe amount of compensation or correction of fuel being injected into cylinders 1 to 4. A positive value indicates fuel is being added, and a negative value means fuel is being reduced. Output is in cubic millimeters per stroke.
Reference: +/- 3 mm3/st (Idle)
Pilot 1 & 2 injection periodDuration of the pilot injection. The 1KD-FTV engine features a pilot injection sequence which is smaller in volume and shorter than the main injection. It's purpose is to reduce engine noise or knock. Apparently, there are 2 pilot injections. Output in microseconds
Target common rail pressureFuel pressure in the common rail that the ECU is aiming for. Output in kiloPascal (absolute).
Fuel pressActual common rail fuel pressure. Output in kiloPascal (gauge).
Reference: 30.000-40.000 kPag
Fuel temperatureTemperature of the fuel entering the fuel pump. Output in degrees Celsius.
Target pump SCV currentTarget electrical current in the suction control valve. The suction control valve is part of the fuel pump. It regulates the amount of fuel being fed to the plungers in the fuel pump. Output in milliamps.
Target EGR positionPosition of the EGR valve as demanded by the ECU. Output in percentage.
Reference: 0-95%
EGR lift sensor volt %Actual position of the EGR valve, as measured by the sensor on top of the valve. Fully closed at full acceleration, fully open at throttle lift-off. Anything in between during cruising speeds and idle. Having only worked on my own car so far, I assumed that this reading was fixed at around 60-70% at idle, but now that I've seen readings from other members I know otherwise.
Reference: Fully closed - Around 15%, fully open - 80-86%
EGR VSVState of the EGR vacuum switching valve, which is used to open and close the EGR valve. Located on the side of the EGR (brown if I'm not mistaken).
VN Turbo commandOpening of the turbo variable vanes. At low rpm the vanes are partially closed for better boost at lower RPM's and they open up as the engine speed climbs. Closing vanes are indicated by an increasing percentage, and the percentage decreases with the vanes opening up.
# codes (include history)The number of diagnostic trouble codes that are currently present
MIL ON run distanceDistance travelled since the check engine light first came on.
Running time from MIL ONTime elapsed since the check engine light first came on
Time after DTC clearedTime elapsed after clearing all trouble codes.
Distance from DTC clearedDistance travelled since clearing all trouble codes
Swirl control valve VSVState of the vacuum switching valve that opens and closes the swirl control valve, used to improve air/fuel mixing.
ON= closed swirl control valve
OFF= open siwrl control valve
A/T Oil Temp from ECTAutomatic transmission oil temperature. Output in degrees Celsius
SPD (NO)Transmission input shaft speed. Output in rpm's
ECT Lock-upState of the torque converter lock-up mechanism. Lock-up improves fuel economy at highway speeds.
Reference: OFF - below 80 km/h, ON - 80 km/h and above
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*Edited 12/12/2013 - Removed the bit about intercooler capacity. Got my math wrong.