Corolla L4-1.8L (2ZZ-GE) (2005)
Steps 7 - 8
General Information
GENERAL INFORMATION
A large number of ECU controlled systems are used in the COROLLA. 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 diagnoses and necessary repairs.
FOR USING HAND-HELD TESTER
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Before using the tester, the tester's operator manual should be read thoroughly.
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If the scan tool or tester cannot communicate with the ECU controlled systems when you have connected the cable of the tester to the DLC3 with
the ignition switch and tester turned ON, there is a problem on the vehicle side or tester side.
1. If 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 communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. Perform the Self
Test procedures outlined in the tester operator's manual.
Basic Inspection
BASIC INSPECTION
a. RESISTANCE MEASURING CONDITION OF ELECTRONIC PARTS
1. Unless stated, all resistance measurements should be made at an ambient temperature of 20 °C (68 °F). Resistance measurements may be
outside the specifications if measured at high temperatures, i.e. immediately after the vehicle has been running. Measurements should be made
after the engine has cooled down.