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On-Board Diagnostics (OBD) Basics Diagnostic Service Definitions

Figure 4-3 Example: DTC “P0237”

The table that follows explains how to define a DTC. Definitions listed for Position 3 in the table are

only valid for DTCs starting with “P”. For other codes (C, B, U) there are other definitions. Please

refer to ruling OBD standards for more information.

Code Ranking

OBD-II/EOBD Codes have a priority according to their emission severity, with higher priority codes

overwriting lower priority codes. The priority of the code determines the illumination of the MIL and

the code erase procedure. Vehicle manufacturers have implemented this ranking differently.

Table 4-2

Diagnostic Trouble Code description

Position Description

P = Power train

C = Chassis

B = Body

U = Network

0 = Standardized emission-related trouble code

1 = Manufacturer-specific trouble code

2 = Standardized or Manufacturer-specific trouble code

3 = Standardized or Manufacturer-specific trouble code

0 = Overall system

1 = Secondary air system/Mixture preparation

2 = Fuel system

3 = Ignition system/Misfires

4 = Additional exhaust gas monitoring

5 = Cruise control/Idle speed control

6 = Input/Output signals, Control units

7 = Gearbox/Transmission

8 = Transmission

9 = Transmission

A = Hybrid Propulsion

B = Reserved

4 & 5 Serial numbering of individual components or systems

Position 1

Position 2

Position 3

Position 4 & 5

P0237

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 71 72

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Blue point Microscan III Manual de usuario Pagina 22