Toyota Celica Supra 1986 Service And Repair Manual page 128

Fl·28
EFI SYSTEM - Diagnosis System
Codo
System
Oiegno.tit
Trouble Area
see-
No.
1. wa·ter temp. sensor
22
Wartu Temp. Open or short circuit in coolent temp.
circuit
Sonsor Signal
sensor signal.
2 . Water temp. sens01 F1·72
3 . ECU
1. Intake air temp. sensor
23
tntakl Air
r emp.
Open
Of'
shcwt circuit •n intake air ,.,...,,
circuit
Son&O< Signal
unsor.
2. Intake air temp. &eniOf
F~38
3 . ECU
Air Flow M eter
Open circuit in
V e
signet or
V s
af'ld
&
1. Air Uow meter circuit
31
Slgnol
short circuited when ldl.e pok'\tt are
2. Air ttow mot et' Fl·37
closed.
3 . ECU
32
Air Fk)w M eter
.
Open circuit in E" or Vc and Vs
thort
Same •• 31, above. Fl·37
Slgnol
circuited.
1. Thron\e
posit~
Thronte Posidon Open or short circuit
in
a.nsor cltcuit
4 1
Stnaor S ignal
thronte position sensor signal.
2 . Throttle position Fl·35
sent or
3 . ECU
tAfT): Signal informing ECU that vehicle 1. Vehicle tpeed sensor
speed is 2 .0 kmJh or less has been
circuit
Input ECU IO< 5 ooconda w ith 2 . Vehicle speed sensor
eng. i ne running It
2.
500 rpm or 3. Tor que conve. n :er
4 2
Vehicle Speed
more and shitt lever Ia in other than
aluwino
Sensor Signal
Nor Prange.
4. ECU
(M ffl: Stgnal infOfming ECU that veh'cle
speed is 2 .0 kmfh or less hos been
input
ecu
for 6 80conds w ith
engine running at 2,&00 rpm or
more.
1. Mein rel'y ci rcuit
Staner Signal
No STA signal to ECU when engine is
2 .
tG
switch c-ircuit
43
(atenorl
Fl·40
I + Bl running over
800
rpm.
3 . IG switch
4. ECU
Neutrt l start switch OFF or 1lr condi· 1. Noutr61 start Stw
51 Switch Signal doner switch ON during di1gnosdc 2. Air con. Sf\/1/
cheek . 3. ECU
52
Knoc. k Sensor
01*' or short circuit in
knock sonsor.
1.
Knoell: sensor circuit
Signal
2 .
Knoc~
sensor
3. ECU
63
Knock Sensor
Faulty ECU. (KNOCK CPUI
ECU
Slgnol