====== DSMLink Loggable Parameters ======

This page contains basic information for DSMLink's loggable data items including minimum, maximum and "ideal" values and explanations of these data items.

^ **Listed Name** ^ **Common name** ^ **Measurement unit** ^ **Min Display** ^ **Max Display** ^ **Min Actual** ^ **Max Actual** ^ **Ideal value** ^ **Description** ^
| A/C rqst (A/C comp) | - | on/off | -1 | 2 | 0 | 1 | - | A/C compressor requested on by A/C computer.  The ECU can ignore this request as it deems necessary.  ECMLink disables the A/C compressor when running wide open throttle, for example.  So this value does *not* indicate the state of the A/C compressor.  It only indicates the requested state from the A/C computer. |
| [[afratioitem|A/F Ratio]] | - | : 1 | 9 | 18 | 9 | 18 | - | Gasoline air/fuel ratio **estimate**.  This is only an estimate!  The calculation basically takes airflow per cylinder firing event and divides this by the amount of fuel that should have been injected during that same event.  The user has to tell the routine which injector size, deadtime, and fuel specific gravity was used by right clicking on A/F Ratio in the graph legend and selecting "Props". |
| A/T D | - | on/off | -1 | 2 | 0 | 1 | - | AutoTrans park/neutral switch.  On a manual trans car, this is the input used for clutch switch wiring.  If this value is changing as you press the clutch pedal, then you have not yet enabled clutch cut operation in the ECU->RPM dialog. |
| ACClutch | - | on/off | -1 | 2 | 0 | 1 | - | A/C Clutch |
| AEM35Bar | - | -inHg/+psi | -30 | 40 |  |  | - | AEM 3.5-bar pressure sensor |
| AEM5Bar | - | -inHg/+psi | -30 | 40 |  |  | - | AEM 5-bar pressure sensor |
| AEMWB | - | :1 | 9 | 18 |  |  | - | Gasoline A/F ratio from AEM wideband sensor |
| AEMWBgauge | - | :1 | 9 | 18 |  |  | - | Gasoline A/F ratio from AEM wideband sensor data.  This differs from the AEMWideband item in that this version works on the gauge type UEGO controllers rather than the non-gauge type. |
| AEMWBgaugeR1 | - | :1 | 9 | 18 |  |  | - | Gasoline A/F ratio from AEM wideband sensor data.  This differs from the AEMWideband item in that this version works on the gauge type UEGO controllers rather than the non-gauge type. |
| AirFlow | - | g/s | 0 | 400 |  |  | - | Airflow values.  Uses properties to define preferred units and limits. |
| AirFlowPerRev | - | g/rev | 0 | 5 |  |  | - | This is literally airflow divided by RPM.  It represents how much air is flowing into each cylinder per firing event.  It's useful for a number of things, such as checking that your airflow at idle is roughly where it should be (around 0.28 g/rev when displayed with the V2 app, 0.24 gm/rev with displayed with the V3 app). |
| AMtrFuelPress | - | psi | 0 | 100 | 0 | 100 | - | Autometer electric fuel pressure gauge |
| AMtrOilPress | - | psi | 0 | 100 | 0 | 100 | - | Autometer electric oil pressure gauge |
| ApexELBoost | - | -inHg/+psi | -30 | 40 |  |  | - | ApexEL pressure sensor |
| ApexELEGT | - | C | 235 | 1300 |  |  | - | ApexEL EGT sensor |
| AVCR3Bar | - | psi | -14.7 | 40 |  |  | - | AVCR3Bar displays boost from an AVC-R boost sensor fed into the MDP sensor input.  This is the 3-bar version, made by Denso. The label reads: "DPS-310-2000A 949940-6270 5v". It has a socket on it for the AVC-R harness. The harness has 3 wires: Blue - Output, Green - 5 volts in, Brown - Ground |
| AVCR4Bar | - | psi | -14.7 | 40 |  |  | - | AVCR4Bar displays boost from an AVC-R boost sensor fed into the MDP sensor input.  This is the 4-bar version. |
| Baro | - | in/Hg | 20 | 32.5 |  |  | - | Barometric pressure sensor |
| Battery | - | v | 0 | 18 |  |  | - | Electrical system voltage as measured at ECU |
| BoostEst | - | -inHg/+psi | -30 | 40 |  |  | - | Estimates boost from airflow per rev.  On a properly configured car, this value should match measured manifold pressure pretty closely at WOT around 5500-6500 RPM.  Above this RPM range, BoostEst is expected to fall off from measured.  The BoostEst calculation is not calibrated to read accurately in any other RPM area. |
| CltchSw | - | on/off | -1 | 2 | 0 | 1 | - | Clutch switch (used for NLTS).  This value will only change after you have enabled clutch cut operation in the ECU->RPM dialog.  Until you check that box, the A/T D indicator will change instead.  More details on the [[cltchsw|CltchSw page]] |
| CoolTmp | - | F | -40 | 420 |  |  | ~200 | Real coolant temperature value.  This value does not include the coolant offset (if one is defined in the ECU->Dash dialog).  To see the value used by the ECU for most stuff like [[FuelTrimUpdatePoints|fuel trim adjustment points]] or fan control while you have a non-zero value entered into the coolant offset field, datalog OffsetCoolTmp instead. |
| DynoJetWB | - | :1 | 10 | 18 |  |  | - | Gasoline A/F ratio from DynoJet wideband sensor |
| EGRSolenoid | - | on/off | -1 | 2 | 0 | 1 | - | EGR valve solenoid |
| FJOWB | - | :1 | 9 | 18 |  |  | - | Gasoline A/F ratio from FJO wideband sensor |
| FourBar | - | -inHg/+psi | -30 | 40 |  |  | - | Pressure value from 4-bar sensor.  Not generally useful as the mapping is only appropriate for a hand-built 4-bar setup used internally at ECMTuning.  Provided in the client just in case we need to send a datalog to someone that contains this value from our own car. |
| FrontO2 | - | v | 0 | 1.1 |  |  | - | Front O2 voltage |
| FuelPmpRly | - | on/off | -1 | 2 | 0 | 1 | - | Fuel pump relay |
| FuelPresSol | - | on/off | -1 | 2 | 0 | 1 | - | Fuel pressure solenoid |
| GM33Bar | - | -inHg/+psi | -30 | 40 |  |  | - | Delphi turbo pressure sensor (Duramax Diesel), 40 to 333 kPa (3.3 bar) |
| GM3Bar | - | -inHg/+psi | -30 | 40 |  |  | - | GM3Bar sensor |
| GMIAT | - | F | -40 | 420 |  |  | - | GM IAT sensor (GM/Delphi #25036751) |
| GreddyBoost52 | - | -inHg/+psi | -30 | 40 |  |  | - | boost sensor used on Greddy Peak/hold 52mm gauges |
| GreddyBoost60 | - | -inHg/+psi | -30 | 40 |  |  | - | boost sensor used on Greddy Peak/hold 60mm gauges |
| [[hptorque|HP]] | - | hp | 0 | 700 |  |  | - | estimated HP from Torque and RPM |
| IdleSw | - | on/off | -1 | 2 | 0 | 1 | - | Idle switch |
| Inj1Enabled | - | on/off | -1 | 2 | 0 | 1 | 1 | Injector 1 enabled |
| Inj2Enabled | - | on/off | -1 | 2 | 0 | 1 | 1 | Injector 2 enabled |
| Inj3Enabled | - | on/off | -1 | 2 | 0 | 1 | 1 | Injector 3 enabled |
| Inj4Enabled | - | on/off | -1 | 2 | 0 | 1 | 1 | Injector 4 enabled |
| InjDuty | - | % | 0 | 200 |  |  | 80% or less | Injector duty cycle |
| InjOn | - | ms | 0 | 20 | 0 | 20 | - | Injector on time |
| IntTemp | Intake Temp | F | -40 | 420 |  |  | - | Temperature as measured on the intake temperature input |
| ISCPosition | - | - | 0 | 255 |  |  | - | Idle speed controller stepper motor position (ECU assumption) |
| KeyOn | - | on/off | -1 | 2 | 0 | 1 | - | Key in on position |
| KeyStart | - | on/off | -1 | 2 | 0 | 1 | - | Key in start position |
| Knock | - | deg | 0 | 15 |  |  | 0 | Degrees of timing retard |
| Lambda | - | v | 0 | 2 |  |  | - | Displays WB data as Lambda |
| LrndIdleAdj | - | - | 0 | 255 |  |  | - | Learned idle adjustment |
| LrndIdleAdjAC | - | - | 0 | 255 |  |  | - | Learned idle adjustment with A/C on |
| [[fueltrimupdatepoints|LTFT Hi]] | - | % | -40 | 40 |  |  | 0 | percentage enrichment applied at high airflow (1g only) |
| [[fueltrimupdatepoints|LTFT Lo]] | - | % | -40 | 40 |  |  | 0 | percentage enrichment applied at low airflow |
| [[fueltrimupdatepoints|LTFT Mid]] | - | % | -40 | 40 |  |  | 0 | percentage enrichment applied at mid airflow |
| MAF | - | hz | -300 | 4000 |  |  | - | MAF value as used by ECU |
| MAFComp | - | hz | -300 | 4000 |  |  | - | MAF value after compensation slider adjustments have been made |
| MAFRaw | - | hz | -300 | 4000 |  |  | - | MAF value as measured by MAS or GM-MAF |
| MAFSD | - | hz | -300 | 4000 |  |  | - | MAF value after VE adjustments are applied |
| MDPSensor | - | inHg | 0 | 40 |  |  | - | pressure value from the factory MDP sensor input.  This sensor is a gauge pressure device. |
| MIL | - | on/off | -1 | 2 | 0 | 1 | - | Indicates check engine light state |
| Mileage | - | mpg | 0 | 40 |  |  | - | Estimated gas mileage |
| MitsuOilTmp | - | F | -40 | 420 |  |  | - | used to datalog a factory coolant temp sensor fed into a non-standard ECU input (primarily the intake air temp input). |
| O2Htr1 | - | on/off | -1 | 2 | 0 | 1 | - | Front O2 heater |
| O2Htr2 | - | on/off | -1 | 2 | 0 | 1 | - | Rear O2 heater (2g only) |
| OBDCatRdy | - | - | -1 | 2 | 0 | 1 | - | OBD2 Cat. Conv. ready for test (2g only) |
| OBDO2Rdy | - | - | -1 | 2 | 0 | 1 | - | OBD2 O2 sensor ready for test (2g only) |
| OBDO2HtrRdy | - | - | -1 | 2 | 0 | 1 | - | OBD2 O2 heater ready for test (2g only) |
| OBDEGRRdy | - | - | -1 | 2 | 0 | 1 | - | OBD2 EGR valve ready for test (2g only) |
| Octane | - | - | 0 | 255 |  |  | - | Long-term octane learned value |
| OffsetCoolTmp | - | F | -40 | 420 |  |  | - | This is the real coolant temp sensor reading with the coolant offset value applied (ECU->Dash dialog).  This is the value used by the ECU for "normal" coolant based checks like [[FuelTrimUpdatePoints|fuel trim update points]] and fan control.  The CoolTmp value listed above is the real value straight from the sensor. |
| OLFTv | - | % | -70 | 70 |  |  | - | percentage enrichment applied during open loop operation via the factory fuel tables, adjusted with user input. |
| OpenLoop | - | on/off | -1 | 2 | 0 | 1 | - | ECU entered into open loop mode |
| P/S load | - | on/off | -1 | 2 | 0 | 1 | - | Power steering system load indicator |
| PacketInt | - | ms | 0 | 100 |  |  | - | Packet interval, the time between consecutive ECMLink-logged data packets |
| PLXWB | - | :1 | 9 | 18 |  |  | - | Gasoline A/F ratio from PLX wideband sensor |
| RadiatorFan | on/off | - | -1 | 2 | 0 | 1 | - | Radiator fan |
| RawKnock1 | - | - | 0 | 255 |  |  | - | **2G only** - RawKnock values are used by the ECU to track knock sensor noise per cylinder firing event.  The ECU averages this value over time across the cylinders to arrive at a knock threshold.  Knock values above this threshold result in ignition retard accordingly.  Logging RawKnock is generally handy to see just how noisy the engine is or to see how much above the threshold a particular knock "event" was. |
| RawKnock2 | - | - | 0 | 255 |  |  | - | See RawKnock1 |
| RawKnock3 | - | - | 0 | 255 |  |  | - | See RawKnock1 |
| RawKnock4 | - | - | 0 | 255 |  |  | - | See RawKnock1 |
| RearO2 | - | v | 0 | 1.1 | 0 | 1.1 | - | Rear O2 volts (2g only) |
| RPM | - | rpm | 0 | 10000 | - | - | - | Engine RPM |
| SelectedLTFT | - | % | -40 | 40 |  |  | - | Shows currently-in-use LTFT |
| Speed | - | mph | 0 | 200 |  |  | - | Speed as determined by vehicle speed sensor |
| STFT | - | % | -40 | 40 |  |  | - | Short term fuel trim |
| StockOLFT | - | % | -70 | 70 |  |  | - | percentage enrichment applied during open loop operation via the factory fuel tables. |
| TechEdgeWB | - | :1 | 9 | 18 |  |  | - | A/F ratio from input to the MDP sensor line.  The signal is assumed to be from a TechEdge kit.  |
| TEWBLin | - | :1 | 9 | 18 |  |  | - | A/F ratio from input to the MDP sensor line.  The signal is assumed to be from a TechEdge v2 kit coming in from the WBLin (linear) output pin. |
| ThrotPos | - | % | 0 | 100 | 0 | 100 | - | Throttle Position |
| Timing | - | deg | -10 | 50 | -10 | 50 | - | Ignition Timing Advance |
| [[hptorque|Torque]] | - | ft-lb | 0 | 700 |  |  | - | estimated Torque from Speed and time values |
| TPSvolts | - | v | 0 | 5 | 0 | 5 | - | TPS sensor voltage |
| TXSBoost | - | -inHg/+psi | -30 | 40 |  |  | - | Turbo XS boost pressure sensor.  Supports calibration data as typically specified by Turbo XS. |
| UserOLFT | - | % | -70 | 70 |  |  | - | UserOLFTCalc is used to calculate percentage enrichment applied during open loop operation via the user selected fuel tables. |
| WBFactor | - | % | -20 | 20 | - | - | - | The % adjustment needed to make the current estimated A/F ratio and the current real A/F ratio match. |
| WGSolenoid | - | on/off | -1 | 2 | 0 | 1 | - | Wastegate solenoid |
| ZT2WB | - | :1 | 9 | 18 |  |  | - | A/F ratio from Zeitronix ZT-2 wideband sensor |