List of the most commonly used abbreviations on OBDII

Reading OBD-II codes:

First position:

P - is for powertrain codes - code associated with the operation of the engine and / or automatic transmission

B - is for body codes - the code is associated with the work of "body systems" (airbags, central locking, power windows)

C - is for chassis codes - the code refers to the chassis system (chassis)

U - is for network codes - the code refers to the system of interaction between electronic units (for example, to the CAN bus)

Second position:

0 - common for OBD-II code

1 and 2 - manufacturer code

3 - reserve

The third item is the type of fault:

1 - fuel system or air supply

2 - ignition system

3 - auxiliary control

4 - idling

5 - ECU or its circuit

6 - transmission

Fourth and fifth positions - the serial number of the error

List of the most commonly used abbreviations on OBDII

AFC - Air flow meter

ALDL - Diagnostic Connector. So used to be called a diagnostic connector for GM cars, as well as a connector for connecting a scanner; can also be used as the name of any OBD II signals

CAN - Controller

CARB - California Atmospheric Resource Council

CFI - Central Fuel Injection (TBI)

CFI - Continuous Fuel Injection

CO - carbon monoxide

DLC - Diagnostic Connector

Driving Cycle - Start-up, warm-up and vehicle movement sequence, during this cycle all OBD II functions are tested.

DTC - Fault Code

ECM - Engine Control Module

EEC - Electronic Engine Management

EEPROM or E2PROM - Programmable read-only memory

EFI - electronic fuel injection

EGR - Exhaust Gas Recirculation

EMR - electronic ignition angle reduction unit

EPA - Council for the Environment

ESC - Electronic Ignition Control

EST - Electronic adjustment of the moment of ignition

Fuel Trim - balancing the composition of the mixture

HC - hydrocarbon

HEI - ignition

HO2S - heated oxygen sensor

ISO 9141 - international standard for OBDII connector

J1850PWM - protocol for OBD II connector, set according to SAE standard

J1850VPW - protocol for OBD II connector, installed according to SAE standard

J1962 - standard for diagnostic connector OBD II, established according to SAE standard

J1978 - SAE standard for OBD II scanners

J1979 - SAE standard for diagnostic modes

J2012 - SAE standard approved by EPA for messages when testing exhaust system

MAF - air flow

MAP - absolute intake manifold pressure

MAT - air temperature in the intake manifold

MIL - fault indicator light. Lamp "Check Engine Light" on the dashboard.

NOx - nitric oxide

O2 - oxygen

OBD - Diagnostics

OBDII or OBD II - an improved standard for the diagnosis of vehicles in the United States after 1-1-96

Parameters - OBD II diagnostic parameters

PCM - Transmission Control Unit

PCV - Carter

Proprietary Readings - On-board computer parameters that are not required for OBD II diagnostics, but can be used to diagnose faults of various types of vehicles.

PTC - Fault Code

RPM - rpm

Scan Tool - Scanner

SES - engine maintenance lamp on the instrument panel

SFI - sequential fuel injection

Stoichiometric (Stoy'-kee-o-metric) Ratio - Combustion Rate

TPS - Throttle Position Sensor

VAC - vacuum

VCM - vehicle control unit

VIN - vehicle identification number

VSS - speed sensor

WOT - open throttle

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