Diagnosis System - Toyota 4A-F Repair Manual

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DIAGNOSIS SYSTEM

DESCRIPTION
The
ECU
which troubles with
detected 8f'ld a che<:k engif'le wemif'l9 light Of'l the if'lltlU­
maf'l! pef'lel flashes.
By af'lalyzing various sigmll. as show" if'l the Ister table
(See page fl-26 or 261 the ECU detects syltem mlllt.,lIlt·
tiof'ls which are related to the various operlllif'lg pafamt!11If
5ensors or actuator. The ECU storea tha fllilure code
associated with the dete<:ted failure uf'ltil the diagnosis
Iystem is clellred by removing the fuse stop
tAT)
15A
The check mgi'" wlIl"f1ifIQ light
beer!
If'lfOfms the driver that a malfunction has beef'l detected
The light goes out automatically wheo the mellul'IC t ioll
has
CHECK ENGINE WARNING LIGHT CHECK
The Check e"9ine wal"f1irog light will come on whef'l thl
1 .
igf'lltiof'l switch is pleo:: e d at
f'ling.
2. Whef'l the '''' 9 'f'le is stMti!ld. thl chllCk If'lgif'le wllmirog lig�.l
should go oul.
If the light remaif'lS Of'l. the diagf'lo,i, system has detected
a malfuf'lClion or abf'lormality If'l the syslem
9f1
OUTPUT OF DIAGNOSTIC CODES
To obtain output of diagnostic codes. proceed as follow:
(al
1
If'litial conditions
Batte<y voltage
hI
lei
Throttle valve fullv cloud (throttle poliliof'l sensor
tOl points closedl
lei)
T.ansmissiof'l in f'leutlal posiTion
Accessories switched
Tum
lei Engine aT reach normal operating tempe.sture
2. the ignition SWilCh to
Using a servic8 wi'e, short termif'l,ls T and El of the chea
3.
Conf'le<:tor.
LOCATION:
4. Read the diagnosTic code
flashes of The check engif'l' wamif'lg light.
"-,
0
contaif'ls buill_if'l self-dia9f'lOsi. aYltem b y
the ef'lgiM .igmill
0'
AM2 IAWl with the igniliof'l switch
7.5A
cleared.
ON
1 1
voltl or more
OFf
ON. 00
n
See p!lge
FI-89
indicated by the
f'letwonr.
15A (AE), EFl
0" the inllrumef' l l pIIfIfI I
and the engif'le is not
not start the engilV!
number of
81"
OFF.
roo­
!