PIDS are usually the serial data that can be seen from the automobile computer making use of a scan tool. PIDS include:
- Position of the OBD II System Component Displays
(Prepared or Complete, or Not Ready or Imperfect) - Live Sensor Information
(Oxygen sensor rich/lean sign, coolant heat, MAP value, TPS value, vehicle acceleration, mass air flow flow, ambient temperature, engine rpm, etc.) - Status of Fuses or Gadgets
(sail handle on/away from. brake your pedal switch on/off. TCC engaged/disengaged, etc.) - Lóng and Short Term Gasoline Trim, O2 sensor combination counts, injector length.
- Air Flow Rate From MAF- The airflow rate as measured by the mass air circulation sensor.
- Absolute Throttle Place- The overall throttle placement (not the comparable or learned) throttle placement. Generally above 0% at idle and less than 100% at full throttle.
- Engine Coolant Temperatures- Engine coolant heat as learn by the motor coolant temperature sensor. This worth should become compared to the real coolant temp to discover if they match up.
You can use an infrared thermometer or additional thermometer to calculate the temp of the cooIant at the thérmostat electric outlet. If the real temp and displayed temperature do not match up, it would tell you the coolant sensor is definitely not reading through properly. - Motor RPM- The present engine quickness in revolutions per minute (RPM).
- Energy Rail Stress- Stress in the gas railroad when the reading through is certainly referenced to atmosphere (gauge pressure).
- Ignition Timing Progress- Degrees of ignition time (spark) advance for #1 canister (not really including mechanised advance). Consumption Manifold
- Pressure- Pressure in the consumption manifold made from a Manifold Absolute Pressure (MAP) sensor.
- Short Term Fuel Trim (STFT)- The correction factor getting used in shut cycle by the PCM to preserve a balanced gasoline blend. If the fuel system is usually open cycle, 0% correction should become reported. As with LTFT, the amount should usually become plus ór minus five. lf better than 10, it indicates a gas mixture problem.
- O2 Sensor Result Voltage- The actual voltage becoming created by the air sensor (should end up being 0.1 to 1.0 volts for a regular zirconia O2 sensor).
For wide-band U2 receptors and linear U2 receptors, the worth may be increased, or it may become converted to a zéro to one voIt level.
There may be multiple O2 sensor PIDS depending on homw several sensors the engien provides (Lender1 sensor 1, Bank2 Sensor 1, etc.). - Time Since Engine Start - Displays the period the motor has long been operating since it was last began. Vehicle Velocity - Displays vehicle street acceleration as examine by the vehicle swiftness sensor (VSS).
- Total Load Worth- This can be the normalized worth of air flow bulk per intake stroke shown as a pct.
- Absolute Throttle Placement- The overall throttle place (not really the relatives or discovered) throttle position. Generally above 0% at idle and much less than 100% at complete throttle.
- Barometric Stress- Barometric stress as motivated by a barometric pressure (BARO) sensor. Notice some weather conditions services record barometric pressure altered to sea level. In these cases, the reported worth may not go with the displayed value.
- Switch Temp- The heat inside the cataIytic converter.
- Instructed Equivalence Proportion- Gasoline techniques that use conventional oxygen sensor shows the commanded open up cycle equivalence percentage while the program is certainly in open loop. Should survey 100% when in closed loop gasoline.
To acquire the real atmosphere/fuel ratio being commanded, multiply the stoichiometric A/N percentage by the equivalence ratio. For instance, gasoline, stoichiometric is certainly 14.64:1 ratio.
If the gas control system was command word an equivalence ratio of 0.95, the commanded A/N percentage to the motor would become 14.64. 0.95 = 13.9 A new/F. - Commanded Evaporative Purge- This worth should read 0% when no clear is told and 100% at the optimum commanded clear placement/flow.
- Commanded Throttle Actuator- This value should become 0% when the throttle will be commanded closed and 100% when the throttle is definitely commanded open up.
- Control Component Voltage- Strength input to the handle module. Usually, this should display battery voltage minus any voltage fall between the battery power and the control component (which should be less than a several tenths of á volt).
Range Since DTCs Cleared - How many kilometers the vehicle has happen to be powered since any DTCs were healed with a scan tool. Range Traveled While Million On- Tells you how numerous miles the vehicle has long been powered with the MIL lighting on. Also shows you
how longer the drivers has been recently ignoring the lighting!- EGR Error- Calculated error as percent of actual commanded EGR. Harmful percent is less than commanded and positive is more than told. The better the value, the even more likely the EGR valve is sticking.
- EVAP Free- This worth is shown as a proportion and is usually normalized for all sorts of EVAP systems. When EVAP clear is instructed off, the worth should become o%, and 100% when it is usually told on.
This is definitely an essential value o check out if the engine offers lower than normal LTFT and STFT energy trim numbers (indicating a wealthy fuel condition). The clear control device may become leaking vapor into the intaké manifold.
Tó eliminate the clear device as a possible supply of gasoline vapor, pinch off the free vapor line, operate the motor and recheck the STFT quantity. If it can be back to normal, the handbag valve is definitely seeping. - EVAP Program Vapor Pressure- Evaporative system vapor pressure normally attained from a sensor located in the energy tank.
- Gas Level Input- Shows the nominal fuel tank liquid fill capability as a percent of optimum.
- Energy Rail Pressure- Indicates the gas rail stress at the engine referenced to atmosphere (gauge pressure).
- Energy Rail Pressure Rel Manifold- The energy rail pressure referenced to the manifold vacuum (comparable stress).
- Intake Air Temperatures- The temperatures of the air flow in the intaké manifold as go through by the intake manifold surroundings heat range sensor. This should be the exact same as ambient heat in a cool motor that offers not become started, and should be increased than normal tempertarue if teh motor is cozy and has been working.
- Minutes Run with MIL On- Accumulated moments of motor run time while the MIL lighting is certainly on.
- O2 Sensor Wide Range mA- Milliamp present for linear ór wide-ratio air sensors.
- U2 Sensor Wide Range Sixth is v- Voltage fór linear or widé-ratio oxygen sensors.
- Comparable Throttle Placement- Relative or discovered throttle place.
- Period Since DTCs Cleared- Accumulated period since DTCs where healed with a scan tool.
Warm-ups Sincé DTCs Cleared - Number of warm-up cycles since all DTCs were eliminated with a scan device. A warm-up is definitely described as the coolant temp increasing by at least 22°D (40°Y) and the engine temperature gets to at a minimum 70°D (160°F), or 60°M (140°N) for diesel powered motors.- Gasoline Program 1 Standing
- Fuel Program 2 Position
- Extra Air Status
- Additional Input Standing
- Misfire Monitor Standing
- Gasoline System Position
- In depth Component Monitoring Status
- Switch Monitoring Status
- Heated Catalyst Monitoring Standing
- Evaporative Program Monitoring Position
- Extra Air System Monitoring Status
- A/M System Refrigerant Monitoring Standing
- Air Sensor Supervising Status
- Air Sensor Heating unit Monitoring Status
- EGR Program Monitoring Status
- ECU Oxygen Sensor Check Results
DIAGNOSTIC VALUE
PIDS provide valuable analysis info when looking at the operation or status of numerous detectors, circuits and buttons in the vehicle's motor management system.
For instance, 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 tool display to discover what the air sensor is informing thé PCM.
Yóu can furthermore evaluate PIDS to find how one element may become influencing another.
For illustration, when you instantly open up the throttle ón an idling engine, rpm should increase, the TPS reading should change and the MAP sensor value should fall.
PIDS can furthermore be likened making use of a 'graphing muItimeter' or on á range that converts the voltage values to waveforms.
Evaluating the waveforms of various related receptors can help you discover errors that might in any other case be impossible to identify.
SCAN Device PID Capacity
Various scan tools have various capabilities to screen PlDS.
Thé OEM scan tools utilized by new car sellers are capable of showing every probable PID value that can be built into the engine management program.
Nearly all general objective aftermarket scan tools do not consist of the software program that allows them to fit the OEM scan equipment in every respect - but for many applications they can display all the important PIDS.
The difficulty is definitely you by no means understand what PIDS are lacking until you go looking for one and discover it isn't now there. Bummer.
That't why many professional experts own several scan equipment: an aftermarket common purpose check device, and one or even more OEM scan equipment for the makes they most frequently function ón.
Live data offers real-time dimensions of system inputs.
Statuses inform you if a change, exchange or various other device is certainly ON/Off of or offers been instructed ON or 0FF.
Readiness monitors tell you if the displays have finished or not.
Test results are assessed by the PCM and likened against preprogrammed move/fail beliefs in teh PCM'h memory space.
Live life DATA:
Unfavorable LTFT figures imply the PCM is delivering much less gasoline to compensate for a rich fuel situation. If the LTFT is usually increased than 10 either method, it may suggest a issue.
Notice: the temp reading will depend on the location of the sénsor. If the sénsor is definitely located under the hóod, it may examine increased than the outdoors temperatrue when the automobile is not shifting becuase of engine heat.
The percent vlue should end up being 0% when EGR is certainly instructed off (at idle), 100% when EGR is definitely instructed on (typically when traveling under lighting weight), and between 0% and 100% is usually the EGR solenoid is duty cycled on ánd off by thé PCM (depending on automobile speed, motor weight and temperatures).
Problems Rules AND Stop FRAME DATA
Code visitors and scan equipment will furthermore screen Stored Diagnostic Trouble Codes (DTCs), generally in numeric order.
Many scan tools can furthermore display Pending Difficulty Requirements.
These are usually codes that suggest a problem has happen to be recognized, but that the problem has not yet repeated.
If the fault repeats under identical driving situations, it will generally result in the Pending Code to turn out to be a Stored Code and convert on the MIL lighting.
Severalcheck out equipmentcan also display Freeze Frame data.
These are usually PIDS that are usually captured when a problem occurs so you can recommend to them later on when diagnosing the problem.
Freeze frame data typically includes associated sensor ideals at the period the fault happened.
STATUS AND READINESS Displays
OBD II demands the following position and openness displays:
PIDS are the serial information that can be utilized from the vehicle computer using a scan device. PIDS include:
- Position of the OBD II Program Component Monitors
(Ready or Complete, or Not really Ready or Imperfect) - Live Sensor Data
(Oxygen sensor wealthy/lean sign, coolant temp, MAP value, TPS value, vehicle quickness, mass air flow flow, ambient temperature, engine rpm, etc.) - Position of Changes or Devices
(cruise control on/away. brake your pedal switch about/off. TCC involved/disengaged, etc.) - Lóng and Short Term Fuel Trim, O2 sensor cross counts, injector length of time.
- Atmosphere Flow Price From MAF- The air flow price as assessed by the mass air movement sensor.
- Overall Throttle Position- The total throttle position (not the relative or learned) throttle position. Generally above 0% at nonproductive and less than 100% at full throttle.
- Engine Coolant Heat- Engine coolant temperatures as go through by the engine coolant heat range sensor. This worth should be compared to the actual coolant temperature to find if they match.
You can use an infrared thermometer or some other thermometer to measure the temperatures of the cooIant at the thérmostat electric outlet. If the real temp and shown temperature do not match up, it would tell you the coolant sensor is usually not reading through correctly. - Motor RPM- The current engine acceleration in cycles per minute (RPM).
- Energy Rail Pressure- Stress in the fuel railroad when the reading is definitely referenced to atmosphere (gauge stress).
- Ignition Timing Progress- Degrees of ignition timing (interest) advance for #1 cylinder (not including mechanical advance). Intake Manifold
- Pressure- Pressure in the consumption manifold extracted from a Manifold Overall Stress (MAP) sensor.
- Brief Term Gas Trim (STFT)- The modification factor becoming used in closed loop by the PCM to maintain a balanced energy mixture. If the energy system is usually open loop, 0% modification should become documented. As with LTFT, the number should generally end up being plus ór minus five. lf higher than 10, it signifies a gasoline mixture issue.
- U2 Sensor Output Voltage- The real voltage getting produced by the air sensor (should end up being 0.1 to 1.0 volts for a standard zirconia U2 sensor).
For wide-band O2 sensors and linear O2 sensors, the worth may be higher, or it may become transformed to a zéro to one voIt level.
There may end up being multiple O2 sensor PIDS based on homw several sensors the engien provides (Loan company1 sensor 1, Standard bank2 Sensor 1, etc.). - Period Since Motor Start - Displays the time the motor has ended up operating since it was last began. Vehicle Speed - Displays vehicle street velocity as read through by the vehicle quickness sensor (VSS).
- Overall Load Value- This will be the normalized worth of air bulk per consumption stroke shown as a pct.
- Absolute Throttle Position- The complete throttle place (not really the comparative or discovered) throttle placement. Usually above 0% at idle and much less than 100% at complete throttle.
- Barometric Pressure- Barometric stress as driven by a barometric pressure (BARO) sensor. Note some weather services document barometric pressure modified to sea level. In these cases, the documented worth may not really complement the displayed worth.
- Catalyst Temp- The temp inside the cataIytic converter.
- Told Equivalence Ratio- Energy techniques that make use of conventional air sensor shows the commanded open cycle equivalence ratio while the program is usually in open up loop. Should document 100% when in shut loop gasoline.
To get the real air/fuel percentage being commanded, exponentially increase the stoichiometric A/Y ratio by the equivalence ratio. For illustration, gas, stoichiometric is certainly 14.64:1 percentage.
If the energy control system was order an equivalence proportion of 0.95, the commanded A/N proportion to the engine would become 14.64. 0.95 = 13.9 A/F. - Commanded Evaporative Free- This value should go through 0% when no purge is commanded and 100% at the optimum commanded clear place/flow.
- Instructed Throttle Actuator- This worth should end up being 0% when the throttle is commanded closed and 100% when the throttle can be commanded open.
- Handle Component Voltage- Strength insight to the control module. Normally, this should show battery voltage minus any voltage drop between the battery pack and the control component (which should be less than a few tenths of á volt).
Range Since DTCs Cleared - How numerous kilometers the vehicle has long been driven since any DTCs were cleared with a scan tool. Distance Traveled While MIL On- Shows you how numerous miles the vehicle has long been powered with the MIL lighting on. Furthermore shows you
how long the drivers has happen to be disregarding the lighting!- EGR Mistake- Calculated mistake as percent of real commanded EGR. Damaging percent will be much less than commanded and beneficial is more than commanded. The better the value, the more likely the EGR valve is usually staying.
- EVAP Purge- This worth is displayed as a proportion and is normalized for all varieties of EVAP systems. When EVAP purge is instructed off, the worth should become o%, and 100% when it is definitely instructed on.
This is usually an essential worth o check out if the engine provides lower than regular LTFT and STFT gasoline trim figures (indicating a rich fuel problem). The clear valve may be leaking vapor into the intaké manifold.
Tó remove the purge valve as a possible supply of gasoline vapor, pinch off the clear vapor hose, operate the engine and recheck the STFT amount. If it is certainly back to regular, the handbag valve is usually leaking. - EVAP System Vapor Stress- Evaporative program vapor stress normally acquired from a sensor situated in the energy tank.
- Fuel Degree Input- Indicates the minimal fuel tank liquid fill up capability as a pct of optimum.
- Energy Rail Stress- Indicates the energy rail pressure at the engine referenced to atmosphere (gauge stress).
- Gas Rail Pressure Rel Manifold- The energy rail pressure referenced to the manifold vacuum cleaner (relatives stress).
- Consumption Air Heat range- The temperatures of the air flow in the intaké manifold as learn by the intake manifold air flow heat range sensor. This should end up being the same as normal temperatures in a cold engine that provides not ended up started, and should end up being higher than ambient tempertarue if teh motor is cozy and has been running.
- A few minutes Run with MIL On- Gathered minutes of engine run time while the MIL light is usually on.
- O2 Sensor Wide Variety mother- Milliamp current for linear ór wide-ratio oxygen sensors.
- U2 Sensor Wide Range Sixth is v- Voltage fór linear or widé-ratio air detectors.
- Comparable Throttle Placement- Comparative or learned throttle place.
- Period Since DTCs Cleared- Gathered period since DTCs where eliminated with a scan device.
Warm-ups Sincé DTCs Cleared - Quantity of warm-up cycles since all DTCs were removed with a scan device. A warm-up will be defined as the coolant temp rising by at least 22°Chemical (40°Y) and the engine temperature reaches at a minimum amount 70°M (160°F), or 60°M (140°F) for diesel powered engines.- Gas System 1 Status
- Fuel Program 2 Standing
- Secondary Air Position
- Additional Input Position
- Misfire Keep track of Status
- Fuel System Position
- Comprehensive Component Supervising Position
- Prompt Monitoring Status
- Heated Prompt Monitoring Status
- Evaporative System Monitoring Position
- Secondary Air Program Monitoring Position
- A/G System Refrigerant Monitoring Position
- Air Sensor Monitoring Position
- Air Sensor Heater Monitoring Position
- EGR System Monitoring Position
- ECU Oxygen Sensor Check Results
DIAGNOSTIC VALUE
PIDS offer valuable analysis info when examining the operation or standing of different sensors, circuits and goes in the automobile's engine management program.
For example, if the Million lamp is definitely on and you find an oxygen sensor code, you can contact up the oxygen sensor PIDS ón your scan tool screen to notice what the air sensor can be telling thé PCM.
Yóu can also evaluate PIDS to see how one element may be affecting another.
For instance, when you abruptly open the throttle ón an idling motor, rpm should increase, the TPS reading through should change and the MAP sensor value should fall.
PIDS can also be compared using 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 difficult to detect.
Check Device PID CAPABILITY
Different scan tools have different features to screen PlDS.
Thé OEM scan tools used by new car dealers are able of showing every possible PID value that is built into the motor management system.
Almost all general objective aftermarket scan equipment do not consist of the software that allows them to match the OEM check out equipment in every regard - but for most applications they can screen all the important PIDS.
The difficulty can be you certainly not understand what PIDS are usually lacking until you go looking for one and discover it isn't now there. Bummer.
That'h why numerous professional experts own multiple scan equipment: an aftermarket common purpose scan device, and one or more OEM scan tools for the helps make they almost all frequently work ón.
Live data provides real-time measurements of system inputs.
Statuses inform you if a switch, relay or various other device is definitely ON/Down or offers been told ON or 0FF.
Readiness monitors inform you if the monitors have completed or not really.
Test results are tested by the PCM and likened against preprogrammed move/fail values in teh PCM's memory space.
Live life Information:
Bad LTFT amounts suggest the PCM can be delivering much less energy to compensate for a wealthy fuel problem. If the LTFT is increased than 10 either way, it may reveal a problem.
Notice: the heat reading through will depend on the place of the sénsor. If the sénsor is definitely situated under the hóod, it may study higher than the outdoors temperatrue when the automobile is not really shifting becuase of engine temperature.
The percentage vlue should become 0% when EGR can be told off (at idle), 100% when EGR will be told on (typically when hanging around under lighting fill), and between 0% and 100% is definitely the EGR solenoid is usually duty cycled on ánd off by thé PCM (depending on vehicle speed, engine insert and temperature).
Difficulty Rules AND Get cold FRAME Information
Code readers and scan tools will furthermore display Stored Diagnostic Difficulty Rules (DTCs), usually in numeric purchase.
Several scan tools can also display Pending Problems Requirements.
These are usually codes that show a mistake has long been recognized, but that the fault has not yet recurring.
If the problem repeats under identical driving circumstances, it will usually trigger the Pending Program code to turn out to be a Stored Code and turn on the MIL light.
Numerouscheck out toolscan furthermore display Freeze out Frame information.
These are PIDS that are taken when a problem occurs so you can send to them afterwards when diagnosing the issue.
Deep freeze frame information typically includes associated sensor beliefs at the time the fault occurred.
STATUS AND READINESS Displays
OBD II needs the sticking with status and readiness displays:
BD2 Module Trouble Code Comprehensive List Gas and Diesel PC. M - TCM - BCM - DDM - IPC - EBCM (ABS) - CANBUS Messaging P0010 'A' Camshaft Position Actuator Circuit (Bank 1).