GS 460 V8-4.6L (1UR-FSE) (2008)
A description of the main areas of each circuit inspection is below.
General Information
INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: GENERAL INFORMATION
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A large number of ECU controlled systems are used in the LEXUS GS460/350. In general, ECU controlled systems are considered to be
very intricate, requiring a high level of technical knowledge to troubleshoot. However, most problem checking procedures only involve
inspecting the ECU controlled system's circuits one by one. An adequate understanding of the system and a basic knowledge of electricity
is enough to perform effective troubleshooting, accurate diagnosis and necessary repairs.
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FOR USING THE TECHSTREAM
Connect the cable of the Techstream to the DLC3, turn the engine switch on (IG) and attempt to use the Techstream. If the display indicates that a
communication error has occurred, there is a problem either with the vehicle or with the Techstream.
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If the communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 of the original vehicle.
Electronic Circuit Inspection Procedure
INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE
1. BASIC INSPECTION
(a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS
(1) Unless otherwise stated, all resistance measurements should be made at an ambient temperature of 20°C (68°F). Resistance measurements
may be inaccurate if measured at high temperatures, i.e. immediately after the vehicle has been running. Measurements should be made
after the engine has cooled down.