ABS FRP (0 - 65,5350 kPA) or (0 - 95050.5 psi)
Absolute Fuel Rail Pressure is the fuel pressure at the engine in respect to atmospheric pressure.

ABS LOAD (0 - 100%)
Absolute Load Value is the normalized value of air mass per intake stroke in percentage.

ABSLT TPS (0 - 100%)
Absolute Throttle Position represents normalized distance the throttle is opened.

ACC POS D,E or F (0 - 100%)
Accelerator Pedal Position represents normalized distance the gas pedal is pressed.

BARO PRESS (0 - 255 kPA) or (0 - 36.9 psi)
Barometric Pressure is usually received from a dedicated barometer, manifold absolute pressure sensor, and other inputs during certain modes of driving.
  ✔ The Baro Press may not exhibit the same value as weather services, which measure barometric pressure at sea level.

CALC LOAD (0 - 100%)
Calculated LOAD Value indicates the normalized load value on the engine.

CAT TEMPxy (- 40 - 6513.5¼C) or ( - 40 - 9999.9¼F)
Catalyst Temperature displays the catalyst substrate temperature for a Bank x catalyst (if used by control module strategy for OBD monitoring) or displays the Bank x Sensor y catalyst temperature sensor.

CLR DST (0 - 65,535 km) or (0 - 40,722 miles)
Distance Since Cleared Diagnostic Codes is the distance driven since diagnostic trouble codes were erased.

CLR TIM (0 - 65,535 min) or (0 - 1092.25 hours)
Time Since Cleared Diagnostic Code is time since diagnostic trouble codes were erased.

CMD EQ RATxy (0 - 1.99)
Commanded Equivalence Ratio is the ratio of the air/fuel mixture. ¥ For systems that use conventional oxygen sensors, the commanded equivalence ratio displays in open loop. In closed loop, the value is 1.0. ¥ Fuel systems using wide-range/linear oxygen sensors display commanded equivalence ratio in both open and closed loop operation.

COOLANT (- 40 - 215¼C) or (- 40 - 419¼F)
Coolant displays engine coolant temperature (ECT) from a ECT sensor or cylinder head temperature sensor.
  ✔ Many diesel engines do not use either sensor and may substitute Engine Oil Temperature instead.

EGR CMD (0 - 100%)
Commanded Exhaust Gas Recirculation is the normalized percentage of exhaust gas being recirculated.

EGR ERR (-100 - 99.22%)
Exhaust Gas Recirculation Error shows the error from changing from one condition to another.

ENG RUN (0 - 65,535 sec.)
Time since Engine Start is the time the engine is running.
  ✔ ENG RUN stops when engine stalls or engine is turned off for any reason.

ENGINE (0 - 16,383.75 RPM)
Engine is the speed engine is running in revolutions per minute (RPM).

EQ RATxy
O2 Sensor Equivalence Ratio is used for linear or wide-ratio oxygen sensors for Bank x Sensor y.

EVAP REQ (0 - 100%)
Commanded Evaporative Purge is the position evaporative purge control valve is open in percentage.

EVAP VP (- 8192 - 8191 PA) or (- 32.8878 - 32.8838 H20)
Evaporative E missions System Vapor Pressure is pressure in the fuel tank

FUEL LVL (0 - 100%)
Fuel Level Input is the percentage of fuel with 0% equaling tank is full and 100% when tank is empty.

FUEL PRES (0 - 765 kPa) or (0 - 110 psi)
Fuel Rail Pressure is the fuel pressure at the engine when reading in reference to atmosphere pressure.

FUEL SYS (OPEN or CLSD)
Fuel System Status show loop status of fuel system banks.

OPEN: Module is operating in Open Loop control strategy. The vehicle has not yet satisfied conditions for Module to go to closed loop.

CLSD: PCM currently functioning in Closed loop control strategy, using O2 sensor( s) as feedback for fuel control

OPEN1: Open Loop control strategy is being used by the PCM due to driving conditions.
Driving conditions that may cause this to happen are power enrich

OPEN2: The PCM is operating in Open Loop control strategy due to detected system fault. Certain actuator or sensor faults will cause module to use an open loop strategy.

CLSD1: Closed Loop control is current storage being used by module, but a fault with at least one O2 sensor has been detected. The control system may be using single O2 for fuel control calculations.

IAT TEMP (- 40 - 215¼C) or (- 40 - 419¼F)
Intake Air Temperature is a measure of intake air temperature to determine correct air/fuel ratios and spark timing operations.

IGN ADV (- 64 - 63.5¼)
Ignition Timing Advance for cylinder is a signal of how much spark advance to add to base engine timing (expressed in crankshaft degrees).

LT FL FTRM (-100 - 99.22%)
Long Term Fuel Trim Bank is the fuel mixture adjustment. The mixture can range, with midpoint being 0.
  ✔ Positive reading indicates module commanded a long-term rich mixture correction in response to a lean operating condition. A negative reading indicates module has commanded a long-term lean mixture in response to a rich operating condition.

MAF (0 - 655.35 g/s) or (0 - 86.5 lb/min)
Mass Air Flow Rate indicates the mass of air entering engine.

MAP (0 - 255 kPa) or (Hg)
Intake Manifold Absolute Pressure displays manifold pressure.

MIL DIST (0 - 65,535 km) or (0 - 40,722 miles)
Distance Traveled while Malfunction Indicator Lamp is Active is a counter that displays distance traveled since the MIL "or Check Engine or Service Engine Soon" light came on.

MIL STAT (ON or OFF)
Monitor Status Data Trouble Code state that module is commanding Malfunction Indicator Lamp to be on if problem exists.

MIL TIME (0 - 65,535 min) or (0 - 1092.25Hrs)
Distance Since Monitor Status Data Trouble Code is the distance traveled since the MIL "or Check Engine or Service Engine Soon" light came on. O2Sxy (0 - 1.275V) Oxygen Sensor Output Voltage is the voltage generated from the oxygen sensor to increase and decrease the amount of exhaust gas. O2Sxy (- 128 - 127.996mA) Oxygen Sensor Output Amp is used for linear or wide ratio oxygen sensors to increase and decrease the amount of exhaust gas

OBD2 STAT (CA, OBDI, US, NONE, EU and/or JA)
On Board Diagnostic shows what vehicle was made for.

CA - Indicates test vehicle meets California on board diagnostic ARB requirements

OBD I - Indicates test vehicle does not meet OBDII requirements.

US - Indicates test vehicle meets Federal EPA requirements.

NONE - Indicates test vehicle is not on board diagnostic compliant.

EU - Indicates test vehicle meets European on board diagnostic requirement.

JA - Indicates test vehicle meets Japanese on board diagnostic requirement.

OUTSID AIR (- 40 - 215¼C) or (- 40 - 419¼F)
Outside Air Temperature gives temperature outside.

PTO STATUS (OFF or ON)
Power Take Off Status allows module to keep track of Power at Take-Off.

REL FRP (0 - 5177.27 kPa) or (0 - 750. psi)
Relative Fuel Rail Pressure (Vacuum) is the fuel rail pressure at engine.

REL TPS (0 - 100%)
Relative Throttle Position is the normalized relative throttle position.

SECOND AIR (AIR_STAT: UPS, DNS or OFF)
Commanded Secondary Air Status is on newer vehicles and actuators to control pollution control.

UPS - UP STREAM module is demanding that secondary air be added at exhaust
manifolds

DNS - DOWN STREAM module is demanding secondary air be added at catalytic
converter

OFF - Module is demanding no secondary air to be added.

ST FTRMxy (- 100 - 99.22%)
Short-term Fuel Trim Bank calculated value represents the short-term relation of fuel metering on a fuel-injected engine.
  ✔ Short-term Fuel Trim calculated value that has a positive percentage is a rich fuel trim and if a negative percentage is present the fuel trim is lean.

ST FLTRMx (- 100 - 99.2%)
Short-term Fuel Trim value represents the short-term relation of fuel metering on a fuel-injected engine.
  ✔ Short-term Fuel Trim value with a positive percentage is a rich fuel trim and if a negative percentage is present the fuel trim is lean.

THR POS (0 - 100%)
Absolute Throttle Position is the position the throttle is located. The more the throttle is closed the less percent shown.

THROT CMD (0 - 100%)
Commanded Throttle Actuator Control is the position of the throttle. If throttle is closed the percent will be 0 and if wide open 100%.

TRIPS SNC CLR (0 - 255)
Number of warm-ups since diagnostic trouble codes cleared. Warm-up is when temperature of coolant rises to at least 22¼C (40¼F) from engine starting and reaching a minimum temperature of 70¼C (160¼F). In a diesel engine, the minimum temperature is 60¼C (140¼F.)
  ✔ If there is more than 255 that the engine warms up the TRIPS SNC CLR will remain at 255.

TROUB CODE (0000 - FFFF)
Trouble Code Parameter will give the diagnostic trouble code that caused a freeze frame capture. This information is helpful in diagnosing the cause of a driveability. If no freeze frame data has been captured, this PID will be zero.

VEH SPEED (0 - 255 K/h) or (0 - 158 mph)
Vehicle Speed shows the speed the vehicle is going.

VPWR (0 - 65.535V)
Control Module Voltage is the power input to the control module.
  ✔ Vehicles using a 42V battery may utilize multiple voltages of different systems. Therefore, the VPWR value may be significantly different than the battery.

#MISF LST 200	Number of Misfire last 200 Revs (Weighted)
#TRPS SNC MISF	Number of Trips Since the Time of Misfire
% GRADE	Percent Grade
1/2 FUEL CUT	50% Fuel Cut OFF Module
1-2 DES WOT	1-2 Shift Desired WOT RPM
1-2 ERROR	1-2 Shift Time Error
1-2 SFT	1-2 Shift Time
1-2 SOL	1-2 Shift Solenoid
1-2 SOL OSG	1-2 Shift Solenoid Open/Short To Ground
1-2 SOL STP	1-2 Shift Solenoid Short To Volts
1-2 WOT APT	1-2 Shift WOT RPM Adapt
1-2APT HICEL	1-2 Adapt High Cell
1-2APT LOCEL	1-2 Adapt Low Cell
1-4 SFT SOL	1-4 Shift Solenoid
12V REF	12 Volt Reference Voltage
1ST GEAR SW	1st Gear Switch
2-1 SHIFT	2-1 Shift Time
2-3 ERROR	2-3 Shift Time Error
2-3 GEAR LOCK	2-3 Gear Lock
2-3 SFT	2-3 Shift Time
2-3 SHIFT	2-3 Shift Time
2-3 SOL	2-3 Shift Solenoid
2-3 SOL OSG	2-3 Shift Solenoid Open/Short To Ground
2-3 SOL STP	2-3 Shift Solenoid Short To Volts
2-3APT HICEL	2-3 Adapt High Cell
2-3APT LOCEL	2-3 Adapt Low Cell
2-4 SOL	2-4 Solenoid
2-4/LR PRES SW	2 - 4 2-4/LR Pressure Switch
2-4KICK-L/R CL	2 - 4 Kickdown or Low / Reverse - Reverse Clutch
2/4 CL VOL IND	2/4 Clutch Volume Index
24X SENSOR	24x Sensor RPM
24X CKP SEN	24 Times Crankshaft Sensor
2-5 LAST CODE	ID 2-5 to Last Code Received
25 MPH REACHED	25 Miles Per Hour Reached
2C CL VOL IND	2C Clutch Volume Index
2C CLUTCH ST	2C Clutch State
2C PRESS SW	2C Pressure Switch
2C SOL	2C Solenoid
2GR START LMP	2 GR Start Lamp
2ND FUEL PUMP	2nd Fuel Pump Relay Control
2ND GEAR SW	2nd Gear Switch
2ND TRIP FT	2nd Trip With Same Fuel Trim
2ND TRIP MISF	2nd Trip With Same Misfires
2WD HIGH LGHT	2 Wheel Drive High Indicator Light
3-2 SFT	3-2 Downshift
3-2 SFT ENABLE	3-2 Downshift Solenoid Enable
3-2 SHIFT	3-2 Shift Time
3-2 SOL PWM	3-2 Downshift Solenoid PWM
3-4 ERROR	3-4 Shift Time Error
3-4 SFT	3-4 Shift Time
3-4 SHIFT	3-4 Shift Time
3-4APT HICEL	3-4 Adapt High Cell
3-4APT LOCEL	3-4 Adapt Low Cell
3RD GEAR SW	3rd Gear Switch
3X ENG ACT	3x Engine Speed Activity
4-3 SHIFT	4-3 Shift Time
4C CLUTCH ST	4C Clutch State
4C PRESS SW	4C Pressure Switch
4C SOL	4C Solenoid
4TH GEAR SW	4th Gear Switch
4WD	4 Wheel Drive
4WD HIGH LIGHT	4 Wheel Drive High Indicator Light
4WD LOW	Low Speed WD
4WD LOW LIGHT	4 Wheel Drive Low Indicator Light
4WD MODE	4-wheel Drive Mode Signal
4X BETWEEN CAM	4X Refrence Between Cam Counter
4X REF CNT	4X Reference Pulse Counter
4X4L	Low Speed 4WD
5V REF A	5 Volts Reference A
5V REF B	5 Volts Reference B
5V REF AUX	Auxillary 5 Volt Output
5V REF PRI	Primary 5 Volt Output
A.I.R. PUMP	Air Injection Reactor Pump Relay Control
A/C CLCH REL	Air Conditioning Clutch Relay
A/C CLUTCH	Air Conditioning Clutch
A/C CLUTCH RLY	Air Conditioning Clutch Relay
A/C COMMAND	Commanded A/C
A/C COMPRESSOR	Air Conditioning Compressor
A/C CUTOUT RLY	Air Conditioning Cutout Relay
A/C EVAP	A/C Evaporative Temperature
A/C PRES	A/C Pressure
A/C PRESS	A/C Pressure A/D
A/C PSI DISAB	A/C Psi Disable
A/C RELAY	Air Conditioning Clutch Relay
A/C REQ	A/C Requested
A/C REQUEST SW	Air Conditioning Requested
A/C RLY COM	Air Conditioning Relay Command
A/C RLY DR H	Air Conditioning Relay Driver High
A/C RLY DR L	Air Conditioning Relay Driver Low
A/C RLY OSG	Air Conditioning Relay Circuit Open/Short To Ground
A/C RLY STP	Air Conditioning Relay Circuit To Volts
A/C SELECT SW	Air Conditioning Select Switch
A/C SLUGGING	A/C Slugging
A/C STATUS	A/C Status
A/D INPUT	A/D Input
A/F DESIRED	A/F Ratio
A/F RATIO	Air Fuel Ratio

See also:
Diagnostic Trouble Code (DTC) glossary
AutoGlossary.com