Toyota Celica Supra 1986 Service And Repair Manual page 126

F1·24
STOPlSA
•
EFI SYSTEM - Diagnosis System
·-
Cancelling out diagnostic code
tal After repair of the trouble area. the diagnostic code
rotained in memory by the ECU must be cancelled out
by removing the STOP fuse 115AI for 30 seconds
Of
more, depending on ambient temperature Uhe lower
the tempereture. the longer the fuse must be left
out)
with the ignit ion switch off.
NOTE :
• Cancellation can also be done by removing tho battery
negative (- I terminal, but in this case other memory sys·
toms trodio ETA, clock, etc. I
will
also be cancelled out.
• If the diagnostic code Is not cancelled out. It will bo
ro-~
t ained by the ECU and appear along with a now codo
in event of futuro C rouble. ·
• If it
is nccossory to work on engine components requir·
lng removal of the battery terminal. a check must first
be made to see If a diagnostic code is detected.
(b) After cancellation. perform a road test, if necessary,
confirm thot a .,normal" code is now read on the
" CHECK ENGINE" warni ng light.
If the same diegnostie code is still
indicated,
It
indi:·
cates that the trouble area has not been repaired
t horoughly •
DIAGNOSIS INDICATION
Ill
Including "Normal" , tho ECU is programmed with the fol·
lowing 16 diagnost ic codes.
121 When 2 or more cocles are indicated, the lowest number
l codel w ill appear first.
However. no other cocle
will
a pear along w ith code No. 11.
131 All detected diagnostic
codu,
except 51 and 53. will bt
rotained In memO<Y by the ECU from the t ime of detection
until cancelled out.
141 Once the malfunction is cleared, the "CHECK ENGINE"
warning light on the Instrument p anel will go out but the
diagnostic codolsl remain stored in ECU memory Cexcept
for code 611.