Autool CS520 사용자 설명서 - 페이지 3

{카테고리_이름} Autool CS520에 대한 사용자 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Autool CS520 10 페이지. Code reader & obd ii scanner

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Diagnostic Trouble Codes consists of a five-digit alphanumeric

code. The first character, a letter, identifies which control system

sets the code. The other four characters, all numbers, provide

additional information on where the DTC originated and the

operating conditions that caused it to set.

OBD II Readiness Monitors

An important part of a vehicle's OBD II system is the Readiness

Monitors, which are indicators used to find out if all of the

emissions components have been evaluated by the OBD II

system. They are running periodic tests on specific systems

and components to ensure that they are performing within

allowable limits.

Not all monitors are supported by all vehicles and the exact

number of monitors in any vehicle depends on the motor

vehicle manufacturer's emissions control strategy.

OBD II Monitor Readiness Status

OBD II systems must indicate whether or not the vehicle's PCM's

monitor system has completed testing on each component. The

purpose of recording, readiness status is to allow inspectors to

determine if the vehicle's OBD II system has tested all the

components and/or systems. Components that have been tested

will be reported as "Ready", or "Complete", meaning they have

been tested by the OBD II system.

OBD II Definitions

Power-train Control Module (PCM) - OBD II terminology for

the on-board computer that controls engine and drive train.

Malfunction Indicator Light (MIL) - Malfunction Indicator Light

(Service Engine Soon, Check Engine) is a term used for the

light on the instrument panel.

DTC - Diagnostic Trouble Codes (DTC) that identify which

section of the emission control system has malfunctioned.

Enabling Criteria - Also termed Enabling Conditions. They are

the vehicle-specific events or conditions that must occur within

the engine before the various monitors will set, or run.

OBD II Drive Cycle - A specific mode of vehicle operation that

provides conditions required to set all the readiness monitors

applicable to the vehicle to the "ready" condition.

Freeze Frame Data - When an emissions related fault occurs,

the OBD II system sets a code, and records a snapshot of the

vehicle operating parameters to help in identifying the problem.

This set of value is Freeze Frame Data.

OBD II Modes of Operation

Mode byte: The first byte in the stream is the mode number.

There are 10 modes for diagnostic requests. The first byte in

the response data bytes is this same number plus 64.

Mode $01 - Identifies the Powertrain information and

shows current data available to the scanner. This data

includes: DTC set, status of ob-board tests, and vehicle data

such as engine RPM, temperatures, ignition advance, speed,

air flow rates, and closed loop status for fuel system.