Celica L4-1.8L (2ZZ-GE) (2005)
Relay Box: Diagnostic Aids
How To Proceed With Troubleshooting
HOW TO PROCEED WITH TROUBLESHOOTING
Carry out troubleshooting in accordance with the procedures. Here, only the basic procedures are shown. Details are provided in Diagnostics section,
showing the most effective methods for each circuit. Confirm the troubleshooting procedures first for the relevant circuit before beginning
troubleshooting of that circuit.
General Information
GENERAL INFORMATION
A large number of ECU controlled systems are used in the CELICA. In general, the ECU controlled system is considered to be a very intricate system
requiring a high level of technical knowledge and expert skill to troubleshoot. However, the fact is that if you proceed to inspect the circuits one by one,
troubleshooting of these systems is not complex. If you have adequate understanding of the system and a basic knowledge of electricity, accurate
diagnosis and necessary repair can be performed to locate and fix the problem.