Toyota Corolla (E120) 2002–2008 Repair Manual / Introduction / How to troubleshoot ecu controlled
systems / General information
Toyota Corolla (E120): General information
There are many ecu controlled systems used in the corolla. In general, ecu controlled system are considered to be very intricate and require a high level of technical knowledge and expert skill to troubleshoot.
The fact is, however, that if you proceed by inspecting the circuits one by one, troubleshooting of these systems is not complex. If you have adequate understanding of the system and basic knowledge of electricity, the problem can be accurately diagnosed and fixed. This manual is designed based on the above principle to help service technicians perform accurate and effective troubleshooting, and is compiled for the following major ecu controlled systems: the troubleshooting procedures are described on the following pages.
System
- Sfi system
- Abs with ebd system
- Electronic controlled automatic transaxle [ect]
- Supplemental restraint system
- Audio system
- Combination meter
- Power door lock control system
- Wireless door lock control system
- Toyota vehicle intrusion protection system
- Cruise control system
For using hand–held tester
- Before using the tester, the tester’s operator manual should be read thoroughly.
- If the tester cannot communicate with the ecu controlled systems when you have connected the cable of tester to the dlc3, turned the ignition switch on and operated the tester, there is a problem on the vehicle side or tester side.
- If the communication is normal when the tester is connected to another vehicle, inspect the diagnosis data link line (bus line) or ecu power circuit of the vehicle.
- If the communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself, so perform the self test procedures outlined in the tester operator’s manual.
Other materials:
Description
When troubleshooting obd ii vehicles, the only difference
from the usual troubleshooting procedure is that you
need to connect the vehicle to the obd ii scan tool complying
with sae j1978 or the hand–held tester, and read
various data output from the vehicle’s ecm.
Obd ii regulation ...
Tire information
Typical tire symbols
► Full-size tire
► Compact spare tire
1 Tire size
2 DOT and Tire Identification Number (TIN)
3 Uniform tire quality grading
For details, see “Uniform Tire Quality Grading” that follows.
4 Location of treadwear indicators
5 Tire ply composition and ma ...
Switching the display
Press to display or hide the album
title.
If there is additional text, is
displayed.
Press and hold to display the remaining
text.
■USB memory functions
●Depending on the USB memory that is connected to the system, the device itself
may not be operable and certain function ...


