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Toyota Corolla Repair Manual: 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

  1. Sfi system
  2.  Abs with ebd system
  3.  Electronic controlled automatic transaxle [ect]
  4.  Supplemental restraint system
  5.  Audio system
  6.  Combination meter
  7.  Power door lock control system
  8.  Wireless door lock control system
  9.  Toyota vehicle intrusion protection system
  10. Cruise control system

For using handheld tester

  1.  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.
  2.  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 operators manual.
How to troubleshoot ecu controlled systems
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How to proceed with troubleshooting
Hint: carry out troubleshooting in accordance with the procedures on the following page. Here, only the basic procedures are shown. Details are provided in the diagnostics section, showing the m ...

Other materials:

Fuel pump shut off system
To minimize the risk of fuel leakage when the engine stalls or when an airbag inflates upon collision, the fuel pump shut off system stops the supply of fuel to the engine. Follow the procedure below to restart the engine after the system is activated. ► Vehicles without a smart key syst ...

Basic inspection
Resistance measuring condition of electronic parts  unless stated, all resistance is measured at an ambient temperature of 20 c (68 F). As the resistance may be outside the specifications if measured at high temperatures immediately after the vehicle has been running, measur ...

Inspection procedure
1 Check fuse(ecuig) Remove the ecuig fuse from the instrument panel j/b.  check the continuity of the ecuig fuse. Ok: continuity 2 Inspect terminal voltage(b) Remove the cruise control ecu assy with connector still connected.  turn the ignition switch to on. ...

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