Equus 3140 - Scan Tool CanOBD2&1 Kit Instrukcja Użytkownika Pobierz pdf (Strona 25)

CanOBD2&1 23

OBD2 Systems

DIAGNOSTIC TROUBLE CODES (DTCs)

DTCs and MIL Status

When the vehicle’s on-board computer detects

a failure in an emissions-related component

or system, the computer’s internal diagnostic

program assigns a diagnostic trouble code

(DTC) that points to the system (and sub-

system) where the fault was found.The diag-

nostic program saves the code in the com-

puter’s memory. It records a “Freeze Frame” of

conditions present when the fault was found, and lights the Malfunction

Indicator Lamp (MIL). Some faults require detection for two trips in a

row before the MIL is turned on.

The “Malfunction Indicator Lamp” (MIL) is the accepted term

used to describe the lamp on the dashboard that lights to

warn the driver that an emissions-related fault has been

found. Some manufacturers may still call this lamp a “Check

Engine” or “Service Engine Soon” light.

P 0 2 0 1

Body

Chassis

Powertrain

Network

Generic

Manufacturer Specific

Generic

Includes both Generic and Manufacturer

Specific Codes

Identifies what section of the system

is malfunctioning

Identifies the system where the

problem is located:

Fuel and Air Metering

Fuel and Air Metering (injector circuit

malfunction only)

Ignition System or Misfire

Auxiliary Emission Control System

Vehicle Speed Control and Idle Control

System

Computer Output Circuits

Transmission

OBD 2 DTC EXAMPLE

P0201 - Injector Circuit Malfunction, Cylinder 1

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 111 112

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