Symptom Confirmation And Diagnostic Trouble Code Check; Abs With Ebd & Ba & Trac System; Abs With Ebd & Ba & Trac & Vsc System; Supplemental Restraint System - Lexus 2005 IS300 User Manual

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2.

SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE CHECK

The diagnostic system in the LEXUS IS300 fulfills various functions.
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The first function is the Diagnostic Trouble Code (DTC) Check. In a DTC Check,a previous malfunc-
tion's DTC can be checked by a technician during troubleshooting. (A DTC is a code stored in the ECU
memory whenever a malfunction in the signal circuits to the ECU occurs.)
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Another function is the Input Signal Check, which checks if the signals from various switches are sent
to the ECU correctly. By using these check functions, the problem areas can be narrowed down and
troubleshooting is more effective. Diagnostic functions are incorporated in the following systems in the
LEXUS IS300.
Engine
Automatic Transmission
ABS with EBD & BA & TRAC System
ABS with EBD & BA & TRAC & VSC System

Supplemental Restraint System

Theft Deterent System

Cruise Control System

Engine Immobiliser System

Combination Meter System

Body Control System

Multiplex Communication System

LEXUS Navigation System

Air Conditioning System
2005 LEXUS IS300 (RM1140U)
INTRODUCTION
System
- HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
Diagnostic Trouble
Code Check
(with Check Mode)
(with Check Mode)
Author :
Input Signal Check Diagnostic Test
(Sensor Check) Mode (Active Test)
Date :
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