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EFI ERRORS CODING TABLE
Self-diagnosis Outline
ECU constantly monitor sensors, actuators and circuits, MIL and battery voltage, etc, even ECU itself and
inspect the sensor output signal, actuator drive signal and internal signal (such as close loop control, coolant
temperature, idle speed control and battery voltage control, etc.) for reliablity. If any process or signal is suspect,
ECU records the trouble code in the RAM memory.
Faulty information is recorded in the form of trouble code, and in the sequence of which trouble comes first. Fault
can be divided into “Current Fault” and “History Fault”.
When servicing, using PDA and MIL, the defective parts can be promptly foud to improve the service efficiency
and quality.
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