Self-Diagnosis Function; Description - Mazda MX-5 1990 Workshop Manual

SELF-DIAGNOSIS FUNCTION
F
SELF-DIAGNOSIS FUNCTION
DESCRIPTION
When troubles occur in the main input devices or output devices, check for the cause using the SST. Failures
of each input and output device are indicated and retrieved from the engine control unit as malfunction code
numbers.
Note
• The engine control unit constantly checks for malfunction of the input devices.
• But, the engine control unit checks for malfunction of output devices only in a 3 second peri-
od after the ignition switch is turned ON and the diagnosis connector terminal (TEN) is grounded.
INPUT
SIGNALS
ENGINE CONTROL UNIT
FAIL·SAFE
FUNCTION
MALFUNCTION
DISPLAY
FUNCTION
MONITOR
FUNCTION
------
SYSTEM
SELECTOR
CHECK
SELF·DIAGNOSIS
CHECKER
02UOFX-066
F-77