Dtc definitions, Diagnostic trouble code definitions – Equus 3030 - CanOBD2 Car Reader User Manual

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OBD2

DTC Definitions

DIAGNOSTIC TROUBLE CODE DEFINITIONS

Diagnostic Trouble Codes (DTCs) are meant to guide you to the proper service
procedure in the vehicle's service manual. DO NOT replace parts based only on
DTCs without first consulting the vehicle's service manual for proper testing
procedures for that particular system, circuit or component.

DTCs are alphanumeric codes that are used to identify a problem that is present
in any of the systems that are monitored by the on-board computer (PCM). Each
trouble code has an assigned message that identifies the circuit, component or
system area where the problem was found.

OBD 2 diagnostic trouble codes are made up of five characters:

■

The 1st character is a letter. It identifies the "main system" where the fault
occurred (Body, Chassis, Powertrain, or Network).

■

The 2nd character is a numeric digit. It identifies the "type" of code (Generic
or Manufacturer-Specific).

Generic DTCs are codes that are used by all vehicle manufacturers.
The standards for generic DTCs, as well as their definitions, are set by
the Society of Automotive Engineers (SAE).

Manufacturer-Specific DTCs are codes that are controlled by the
vehicle manufacturer. The Federal Government does not require
manufacturer-specific codes in order to comply with the new OBD 2
emissions standards. However, manufacturers are free to expand
beyond the required codes to make their systems easier to diagnose.

■

The 3rd character is a numeric digit. It identifies the specific system or sub-
system where the problem is located.

■

The 4th and 5th characters are numeric digits. They identify the section of
the system that is malfunctioning.

This section provides the most complete list of “Generic” DTC definitions
available at the time of publication. OBD 2 is an evolving system; new codes and
definitions are added as the system grows. ALWAYS check your vehicle's
service manual for code definitions that are not listed here, or for “Manufacturer-
Specific” DTC definitions. For more information, visit our web site at
www.CodeReader.com.

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