The ECU contains a built-in self-diagnosis system by which troubles with the engine signal network are detected and a "CHECK ENGINE" warning light on the instrument panel flashes (Code Nos. 12. 13. 14. 21. 22. 31. 32. 42, 52 and 53).
A "CHECK ENGINE" warning light on the instrument panel informs the driver that a malfunction has been detected. The light goes out automatically when the malfunction has been cleared.
The diagnostic code can be read by the number of blinks of the "CHECK ENGINE" warning light when terminals T and Ei are short-circuited.
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