Self-Diagnosis Function - Mazda 121 Workshop Manual

F
SELF.DIAGNOSIS FUNCTION
SELF.DIAGNOSIS
FUNCTION
DESCRIPTION
Whintroubles occur in the main input devices or output devices' check for the cause using the SST Failures
oieactt inpuiina output device aie indicated and retrieved lrom the engine controlunit (ECU) as malfunc-
tion code numbers.
Note
. ihe EGu constantly checks tor maltunction of the inputdevic€s. But'-the-ECU checks lormaF
dndion ot output?evbes only In a thtee seconds perlod after the ignltion switch is turned
ON when ihe fEN lerminal ol the diagnosis conneclor ls grounded.
ENGINE CONTFOL UNIT
OUTPUT
oEvtcEs
SYSTEM
SELECTOR
SELF.DIAGNOSIS
CHECKER
F-66