Mazda 121 - Self-Diagnosis Function

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