PIDS are usually the serial data that can become reached from the vehicle computer making use of a scan device. PIDS include:
ABS codes and definitions for most 1996-2013 GM, Ford, Chrysler, Toyota, Honda, Nissan, and Hyundai vehicles LIVE real-time data, over 300 possible data PIDs available (depending on vehicle) Record / Playback of live data.
- Status of the OBD II Program Component Monitors
(Ready or Full, or Not really Ready or Unfinished) - Live Sensor Data
(Air sensor wealthy/lean indication, coolant temp, MAP value, TPS worth, vehicle acceleration, mass atmosphere flow, normal temperature, motor rpm, etc.) - Status of Switches or Devices
(luxury cruise control on/away from. brake pedal switch in/off. TCC engaged/disengaged, etc.) - Lóng and Short Term Fuel Cut, O2 sensor cross counts, injector period.
- Air Flow Price From MAF- The air flow price as measured by the bulk air circulation sensor.
- Absolute Throttle Placement- The complete throttle placement (not really the relatives or discovered) throttle position. Usually above 0% at nonproductive and less than 100% at complete throttle.
- Engine Coolant Temperature- Engine coolant temperature as learn by the engine coolant temp sensor. This value should end up being likened to the actual coolant heat range to notice if they match up.
You can make use of an infrared thermometer or various other thermometer to measure the heat range of the cooIant at the thérmostat electric outlet. If the real heat and shown temperature do not fit, it would inform you the coolant sensor is not reading properly. - Motor RPM- The present engine rate in revolutions per minute (RPM).
- Gas Rail Pressure- Stress in the fuel rail when the reading through can be referenced to atmosphere (gauge pressure).
- Ignition Time Progress- Degrees of ignition timing (spark) advance for #1 cylinder (not including mechanised advance). Intake Manifold
- Stress- Pressure in the consumption manifold derived from a Manifold Absolute Stress (Chart) sensor.
- Short Term Energy Trim (STFT)- The correction factor getting utilized in closed loop by the PCM to keep a balanced fuel mixture. If the energy system is open cycle, 0% correction should become reported. As with LTFT, the quantity should generally be plus ór minus five. lf higher than 10, it indicates a fuel mixture issue.
- O2 Sensor Output Voltage- The real voltage getting produced by the oxygen sensor (should end up being 0.1 to 1.0 volts for a conventional zirconia U2 sensor).
For wide-band O2 receptors and linear O2 receptors, the value may be increased, or it may become transformed to a zéro to one voIt range.
There may end up being multiple O2 sensor PIDS depending on homw many sensors the engien has (Loan company1 sensor 1, Bank or investment company2 Sensor 1, etc.). - Time Since Motor Begin - Displays the period the engine has been recently working since it has been last began. Vehicle Rate - Displays vehicle road swiftness as go through by the automobile speed sensor (VSS).
- Absolute Load Worth- This can be the normalized value of surroundings bulk per intake stroke shown as a percent.
- Absolute Throttle Place- The total throttle place (not really the essential contraindications or discovered) throttle position. Usually above 0% at nonproductive and less than 100% at full throttle.
- Barometric Stress- Barometric stress as motivated by a barometric stress (BARO) sensor. Take note some weather conditions services report barometric pressure adjusted to sea degree. In these situations, the documented worth may not really complement the displayed worth.
- Driver Temperature- The heat range inside the cataIytic converter.
- Commanded Equivalence Ratio- Gasoline techniques that use conventional air sensor shows the commanded open up loop equivalence ratio while the system is usually in open up loop. Should record 100% when in shut loop gasoline.
To get the real atmosphere/fuel proportion becoming commanded, exponentially increase the stoichiometric A/F ratio by the equivalence ratio. For instance, gasoline, stoichiometric can be 14.64:1 ratio.
If the energy control system was command an equivalence proportion of 0.95, the commanded A/N proportion to the motor would become 14.64. 0.95 = 13.9 A new/F. - Told Evaporative Clear- This value should read through 0% when no purge is instructed and 100% at the maximum commanded clear position/flow.
- Told Throttle Actuator- This worth should become 0% when the throttle will be commanded closed and 100% when the throttle is commanded open up.
- Handle Component Voltage- Power insight to the handle module. Usually, this should display battery voltage minus any voltage drop between the battery pack and the handle component (which should be less than a several tenths of á volt).
Length Since DTCs Cleared - How many miles the automobile has ended up powered since any DTCs had been eliminated with a scan device. Distance Traveled While Million On- Shows you how many miles the vehicle has happen to be powered with the MIL light on. Furthermore informs you
how longer the motorist has long been disregarding the light!- EGR Error- Calculated error as pct of real commanded EGR. Harmful percent is definitely much less than commanded and beneficial is more than told. The better the value, the even more likely the EGR control device is staying.
- EVAP Free- This worth is displayed as a proportion and is definitely normalized for all forms of EVAP systems. When EVAP clear is instructed off, the worth should end up being o%, and 100% when it is commanded on.
This will be an essential value o check out if the engine provides lower than regular LTFT and STFT gas trim figures (indicating a wealthy fuel condition). The free valve may become leaking vapour into the intaké manifold.
Tó remove the free device as a feasible resource of energy vapor, touch off the clear vapor hose, run the motor and recheck the STFT quantity. If it is usually back to regular, the purse valve can be dripping. - EVAP Program Vapor Pressure- Evaporative system vapor stress normally acquired from a sensor situated in the gas container.
- Energy Degree Input- Shows the minimal fuel tank liquid fill up capability as a pct of optimum.
- Energy Rail Stress- Indicates the energy rail stress at the motor referenced to atmosphere (gauge pressure).
- Energy Rail Pressure Rel Manifold- The gasoline rail pressure referenced to the manifold vacuum (comparative pressure).
- Intake Air Temperature- The temp of the atmosphere in the intaké manifold as read by the intake manifold surroundings heat sensor. This should be the exact same as normal temp in a cold engine that provides not been began, and should become higher than normal tempertarue if teh engine is warm and offers been working.
- Mins Work with MIL On- Accumulated moments of engine run period while the MIL light will be on.
- O2 Sensor Wide Range mA- Milliamp present for linear ór wide-ratio air sensors.
- O2 Sensor Wide Variety V- Voltage fór linear or widé-ratio oxygen receptors.
- Relatives Throttle Position- Comparative or discovered throttle place.
- Period Since DTCs Cleared- Accumulated period since DTCs where cleaned with a scan device.
Warm-ups Sincé DTCs Cleared - Quantity of warm-up series since all DTCs had been eliminated with a scan tool. A warm-up will be defined as the coolant heat increasing by at minimum 22°D (40°F) and the engine temperature reaches at a least 70°C (160°F), or 60°G (140°N) for diesel powered engines.- Fuel Program 1 Status
- Gas Program 2 Standing
- Secondary Air Position
- Auxiliary Input Standing
- Misfire Monitor Standing
- Energy System Standing
- Comprehensive Component Supervising Standing
- Driver Monitoring Status
- Heated Driver Monitoring Status
- Evaporative System Monitoring Position
- Extra Air Program Monitoring Status
- A/G Program Refrigerant Monitoring Standing
- Air Sensor Monitoring Status
- Oxygen Sensor Heater Monitoring Position
- EGR System Monitoring Position
- ECU Air Sensor Check Results
DIAGNOSTIC Worth
PIDS provide valuable diagnostic info when looking at the operation or standing of several detectors, circuits and fuses in the vehicle's motor management program.
For illustration, if the Million lamp is in and you discover an oxygen sensor program code, you can call up the air sensor PIDS ón your scan device screen to discover what the air sensor is informing thé PCM.
Yóu can furthermore evaluate PIDS to observe how one element may be influencing another.
For example, when you suddenly open up the throttle ón an idling motor, rpm should enhance, the TPS reading should modify and the Chart sensor worth should drop.
PIDS can furthermore be compared making use of a 'graphing muItimeter' or on á scope that converts the voltage values to waveforms.
Evaluating the waveforms of many related detectors can help you discover errors that might otherwise be impossible to detect.
Check out TOOL PID CAPABILITY
Different scan equipment have various capabilities to display PlDS.
Thé OEM scan tools utilized by fresh car dealers are able of exhibiting every probable PID worth that is certainly constructed into the motor management program.
Almost all general purpose aftermarket scan tools do not contain the software program that enables them to suit the OEM scan tools in every regard - but for most programs they can screen all the essential PIDS.
The problems will be you under no circumstances understand what PIDS are lacking until you proceed looking for one and find it isn't right now there. Bummer.
That't why many professional technicians own several scan equipment: an aftermarket general purpose check device, and one or more OEM scan tools for the helps make they most frequently function ón.
Live data provides real-time dimensions of program inputs.
Statuses tell you if a switch, exchange or other device will be ON/Out of or provides been instructed ON or 0FF.
Readiness monitors tell you if the screens have completed or not.
Test outcomes are sized by the PCM and compared against preprogrammed move/fail ideals in teh PCM'h memory.
Live life Information:
Bad LTFT amounts imply the PCM is certainly delivering much less fuel to make up for a wealthy fuel problem. If the LTFT is usually increased than 10 either method, it may suggest a problem.
Be aware: the temperature reading will depend on the place of the sénsor. If the sénsor is usually located under the hóod, it may study higher than the outside temperatrue when the automobile is not really moving becuase of motor heat.
The proportion vlue should end up being 0% when EGR will be told off (at nonproductive), 100% when EGR is definitely instructed on (typically when cruising under light load), and between 0% and 100% is usually the EGR solenoid can be duty cycled on ánd off by thé PCM (based on automobile speed, motor weight and temp).
Difficulty Rules AND FREEZE FRAME Information
Code visitors and scan equipment will also screen Stored Diagnostic Problems Requirements (DTCs), usually in numeric purchase.
Many scan tools can also display Pending Trouble Codes.
These are usually rules that indicate a mistake has happen to be detected, but that the fault has not yet repeated.
If the fault repeats under equivalent driving problems, it will usually trigger the Pending Code to turn out to be a Stored Code and turn on the MIL light.
Numerouscheck out equipmentcan furthermore display Get cold Frame data.
These are PIDS that are usually captured when a mistake occurs therefore you can pertain to them later on when diagnosing the problem.
Stop frame data typically contains associated sensor values at the time the mistake happened.
Position AND Preparedness Displays
OBD II requires the using position and readiness displays:
PIDS are the serial information that can be utilized from the vehicle computer making use of a scan device. PIDS include:
- Status of the OBD II System Component Screens
(Ready or Total, or Not Prepared or Incomplete) - Live life Sensor Information
(Air sensor rich/lean sign, coolant temp, MAP worth, TPS value, vehicle quickness, mass atmosphere flow, ambient temperature, engine rpm, etc.) - Standing of Switches or Gadgets
(get control on/off. brake your pedal switch in/off. TCC engaged/disengaged, etc.) - Lóng and Brief Term Gas Trim, O2 sensor mix matters, injector length.
- Atmosphere Flow Rate From MAF- The airflow price as measured by the bulk air stream sensor.
- Complete Throttle Position- The overall throttle placement (not really the relatives or discovered) throttle placement. Generally above 0% at nonproductive and much less than 100% at complete throttle.
- Engine Coolant Temp- Engine coolant temperature as read by the motor coolant temperature sensor. This value should become likened to the actual coolant temperatures to find if they match up.
You can use an infrared thermometer or additional thermometer to calculate the temperature of the cooIant at the thérmostat shop. If the real heat and displayed temperature do not match, it would tell you the coolant sensor will be not reading properly. - Engine RPM- The present engine swiftness in cycles per moment (RPM).
- Gasoline Rail Stress- Stress in the gasoline railroad when the reading can be referenced to atmosphere (gauge pressure).
- Ignition Timing Progress- Degrees of ignition time (interest) advance for #1 cylinder (not really including mechanical progress). Consumption Manifold
- Stress- Stress in the intake manifold extracted from a Manifold Overall Stress (Chart) sensor.
- Short Term Gas Trim (STFT)- The correction factor becoming used in shut loop by the PCM to keep a balanced gas mix. If the fuel system is open cycle, 0% correction should be documented. As with LTFT, the quantity should usually become plus ór minus five. lf higher than 10, it indicates a gasoline mixture issue.
- O2 Sensor Result Voltage- The actual voltage becoming produced by the air sensor (should be 0.1 to 1.0 volts for a standard zirconia O2 sensor).
For wide-band U2 sensors and linear O2 sensors, the worth may end up being increased, or it may be converted to a zéro to one voIt size.
There may be multiple U2 sensor PIDS depending on homw several receptors the engien offers (Bank or investment company1 sensor 1, Bank or investment company2 Sensor 1, etc.). - Time Since Motor Begin - Shows the period the engine has happen to be operating since it was last started. Vehicle Rate - Shows vehicle road velocity as read through by the vehicle acceleration sensor (VSS).
- Overall Load Worth- This is definitely the normalized value of surroundings bulk per intake stroke displayed as a pct.
- Complete Throttle Position- The overall throttle position (not really the comparative or learned) throttle place. Usually above 0% at nonproductive and less than 100% at complete throttle.
- Barometric Pressure- Barometric stress as established by a barometric pressure (BARO) sensor. Take note some weather services document barometric stress modified to sea degree. In these instances, the reported worth may not really match up the displayed worth.
- Switch Temperature- The temperature inside the cataIytic converter.
- Instructed Equivalence Proportion- Fuel systems that use conventional air sensor displays the commanded open up cycle equivalence proportion while the program will be in open up cycle. Should report 100% when in closed loop gas.
To get the actual air flow/fuel percentage being commanded, multiply the stoichiometric A/N proportion by the equivalence ratio. For instance, fuel, stoichiometric will be 14.64:1 ratio.
If the gasoline control system was order an equivalence proportion of 0.95, the commanded A/F percentage to the engine would be 14.64. 0.95 = 13.9 A/F. - Told Evaporative Free- This worth should go through 0% when no purge is instructed and 100% at the optimum commanded purge position/flow.
- Told Throttle Actuator- This value should become 0% when the throttle is usually commanded closed and 100% when the throttle is certainly commanded open up.
- Control Component Voltage- Energy insight to the handle module. Normally, this should display battery voltage minus any voltage drop between the electric battery and the control component (which should end up being much less than a few tenths of á volt).
Distance Since DTCs Cleared - How numerous miles the automobile has been driven since any DTCs had been healed with a scan tool. Length Traveled While MIL On- Shows you how several kilometers the vehicle has happen to be powered with the MIL lighting on. Furthermore informs you
how long the motorist has been ignoring the lighting!- EGR Error- Calculated error as percent of real commanded EGR. Negative percent is certainly much less than commanded and good is more than instructed. The greater the value, the even more likely the EGR valve will be staying.
- EVAP Free- This worth is displayed as a percent and will be normalized for all sorts of EVAP techniques. When EVAP purge is told off, the worth should end up being o%, and 100% when it can be told on.
This will be an important worth o check out if the motor provides lower than normal LTFT and STFT fuel trim amounts (suggesting a rich fuel situation). The free valve may end up being leaking steam into the intaké manifold.
Tó remove the clear valve as a feasible source of fuel vapor, touch off the purge vapor hose, operate the engine and recheck the STFT number. If it is back again to normal, the purse valve is definitely leaking. - EVAP Program Vapor Stress- Evaporative system vapor pressure normally obtained from a sensor located in the fuel tank.
- Gas Degree Input- Shows the minimal fuel container liquid fill up capability as a percent of optimum.
- Fuel Rail Pressure- Indicates the fuel rail stress at the engine referenced to atmosphere (gauge stress).
- Gasoline Rail Pressure Rel Manifold- The fuel rail stress referenced to the manifold vacuum cleaner (relative pressure).
- Intake Air Heat- The temperatures of the atmosphere in the intaké manifold as read through by the intake manifold surroundings temp sensor. This should become the same as ambient temperatures in a chilly motor that offers not ended up started, and should be higher than ambient tempertarue if teh motor is comfy and offers been running.
- Moments Run with MIL On- Gathered a few minutes of engine run period while the MIL lighting will be on.
- O2 Sensor Wide Variety mA- Milliamp current for linear ór wide-ratio air detectors.
- O2 Sensor Wide Variety V- Voltage fór linear or widé-ratio oxygen detectors.
- Essential contraindications Throttle Place- Essential contraindications or learned throttle place.
- Period Since DTCs Cleared- Gathered time since DTCs where cleared with a scan device.
Warm-ups Sincé DTCs Cleared - Amount of warm-up series since all DTCs were healed with a scan device. A warm-up is certainly described as the coolant temp rising by at least 22°M (40°N) and the engine temperature gets to at a minimum amount 70°C (160°N), or 60°G (140°Y) for diesel motors.- Gasoline Program 1 Position
- Fuel Program 2 Standing
- Secondary Air Position
- Additional Input Status
- Misfire Monitor Standing
- Energy System Position
- In depth Component Supervising Standing
- Switch Monitoring Standing
- Heated Switch Monitoring Position
- Evaporative System Monitoring Position
- Extra Air Program Monitoring Position
- A/Chemical System Refrigerant Supervising Position
- Oxygen Sensor Monitoring Status
- Air Sensor Heater Monitoring Position
- EGR Program Monitoring Status
- ECU Air Sensor Check Outcomes
DIAGNOSTIC VALUE
PIDS offer valuable diagnostic details when checking the operation or status of various receptors, circuits and buttons in the automobile's engine management system.
For example, if the MIL lamp is about and you discover an oxygen sensor code, you can contact up the oxygen sensor PIDS ón your scan tool display to see what the air sensor is informing thé PCM.
Yóu can also compare PIDS to find how one component may be affecting another.
For instance, when you all of a sudden open the throttle ón an idling engine, rpm should raise, the TPS reading should modify and the Chart sensor worth should drop.
PIDS can also be likened using a 'graphing muItimeter' or on á range that converts the voltage values to waveforms.
Evaluating the waveforms of several related receptors can help you find faults that might usually be difficult to detect.
Check out Device PID Ability
Different scan tools have various capabilities to screen PlDS.
Thé OEM check tools used by brand-new car dealers are able of showing every possible PID worth that is definitely constructed into the motor management system.
Nearly all general objective aftermarket scan equipment do not consist of the software that allows them to match up the OEM scan tools in every respect - but for many programs they can screen all the important PIDS.
The trouble can be you never understand what PIDS are missing until you go looking for one and find it isn't there. Bummer.
That't why many professional techs own several scan tools: an aftermarket general purpose check out tool, and one or more OEM scan tools for the makes they almost all frequently function ón.
Live life data offers real-time dimensions of system advices.
Statuses inform you if a change, exchange or various other device can be ON/Out or offers been told ON or 0FF.
Preparedness monitors inform you if the screens have finished or not really.
Test results are measured by the PCM and likened against preprogrammed move/fail values in teh PCM'h storage.
Live life DATA:
Unfavorable LTFT numbers imply the PCM will be delivering less gasoline to compensate for a rich fuel condition. If the LTFT will be increased than 10 either way, it may show a problem.
Take note: the temp reading will rely on the location of the sénsor. If the sénsor can be situated under the hóod, it may read higher than the outside temperatrue when the vehicle is not really relocating becuase of engine heat.
The percentage vlue should become 0% when EGR will be commanded off (at nonproductive), 100% when EGR will be told on (typically when touring under gentle weight), and between 0% and 100% can be the EGR solenoid can be responsibility cycled on ánd off by thé PCM (depending on automobile speed, engine insert and temperatures).
Problems Requirements AND Get cold FRAME DATA
Code visitors and scan tools will also display Stored Diagnostic Difficulty Rules (DTCs), generally in numeric order.
Many scan tools can also display Pending Difficulty Requirements.
These are usually rules that indicate a problem has been recognized, but that the problem has not really yet recurring.
If the mistake repeats under related driving problems, it will usually trigger the Pending Code to become a Stored Program code and convert on the MIL light.
Manycheck out toolscan furthermore display Stop Frame information.
These are usually PIDS that are taken when a mistake occurs so you can refer to them later on when figuring out the problem.
Get cold frame data typically includes associated sensor beliefs at the period the fault occurred.
Standing AND Preparedness MONITORS
OBD II needs the right after status and preparedness displays: