How To Troubleshoot Ecu Controlled Systems; General Information - Toyota Corolla 2002 Repair Manual Supplement

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HOW TO TROUBLESHOOT ECU C ONTROLLED SYSTEMS

GENERAL INFORMATION

A large number of ECU c ontrolled systems are used in the COROLLA. In general, ECU controlled systems
are c onsidered to be very intricate, requiring a high level of technical k nowledge 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. Detailed information and troubleshooting pro -
cedures on the main ECU controlled systems in this vehicle are outlined below:
1. ECD System [1ND--TV]
2. Multi--mode Manual Transmission System
3. Combination Meter
4. Engine Immobilizer System
FOR USING INTELLIGENT TESTER II
Before using the intelligent tester ll, the tester operator's manual should be read thoroughly.
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If the tester cannot communicate with the ECU controlled systems when you have connected the cable
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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 not possible 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.
COROLLA Supplement (RM1129E)
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E
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