1987 TOYOTA CELICA air condition

FI-52 EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MA)
No.
‘10 Terminals
lGdA - El
IGdS Trouble
No voltage
._
Condition
idling STD Voltage /
1 -3V
‘7M-GTE only
Fusible
Link
AM2
30A Ignition
Switch
AM241G2
T
Battery 1
L
I
= TO
7 Tachometer
niter
L
I
=
ECU
IGdA
IGdB
El
Joltmeter
F1195
-l
0
There is no voltage between ECU terminals IGdA or IGdB and
El. (Idlinal
0 Check that there is voltage between ECU terminal IGdA or
IGdB and body ground. (Idling)
,
I
I , NO 1 9
0
Check wiring between ECU BAD Repair or
L
terminal El and body ground. replace.
OK
Try another ECU.
Check fusible links and ignition BAD
switch. - Repair or replace.
c
I
I 1
I r 1 Check cam position sensor.
(See page IG-18)
I Repair or replace.
I
Check wiring between ECU and
batter-v. Repair or replace.
I 1 J
I
BAD
I I I

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MA) FI-53
No.
Terminals
Trouble Condition
STD Voltage
11 ISCl - ISC4 - El No voltage
Ignition switch ON
g-14v
Fusible
Link EFI Main Relay
ISC Valve
Fuse
EFI 15A
Fusible
Link
h MAIN 2.OL AM2 30A
I
, ECU
ISCI
ISC2
ISC3
ISC4
+B
+Bl
M-REL
01
doltmeter
@I
Bl
V
PI
Y
I Fk-n12
Fl16431
0 There is no voltage between ECU terminals ISCl - ISC4 and
El. (IG S/W ON1
0 check that there is voltage between ECU terminal +B (+Bl)
and body ground. UG S/W ON)
OK
1 Check wiring between ECU terminal El and body ground. 1
I OK
0 Check ISC valve.
(See page.FI-I 08)
, 1 Repair or replace. )
I
Replace ISC
I I Check wiring between ECU and EFI
valve.
main relay.
I

EFI SYSTEM - Troub!eshoo$ng with Volt/Ohmmeter (MA)
. .
JO. Terminals
12 W - El Trouble
No voltage Condition
Nq @uble, (“CHECK” engine warning
light off) and engine running STD Voltage
s-14v
FUSE
GAUGE 7.5A
i
f “CHECK ENGINE”
Wahiing Light
Combination Mete W
El
FlO7
Joltmeter
EL v “_
Fl1251
1
Voltmeter
FH25C
. .
~0 There is no voltage between ECU terminals W and El.
(Idlin$
,
.
I 0
Check that there is voltage between ECU terminal W and
I
hod
Q;
0 Check wiring between ECU terminal El and body
Check GAUGE fuse (7.5A) and “CHECK
ENGINE” warning light.
I I
I Repair or replace.
I
1
Check wiring between ECU terminal BAD
*
W and fuse. Repair or replace.
I I
1 I

No. Terminals
13 A/C - El Trouble
No voltage , Condition
Air conditioning ON STD Voltage
10 - 14 v
A/C
Amplifier T
Lllintl NC Compressor ECU
NC
El
Voltmeter
F1125
Voltmeter
Ohmmeter
0 There is no voltage between ECU terminals A/C and El.
(Air conditioning ON)
I i
I 0
Check that there is voltage between ECU terminal A/C and 1
bodl y ground.
I
NO OK .‘.
0 Check wiring between ECU terminal El and body
ground.
BAD
terminal A/C and
Check that there is voltage between
BAD
amplifier terminal and body ground. c Repair or replace.
I c
1 OK
Check wiring between amplifier and BAD
ECU or compressor. * Repair or replace.

;6 EFI SYSTEM .L Troubleshooting with VoWOhmmeier (MA)
0. Terminals
r4 HAC - E2
7M-GTE only Trouble ‘Z’ ‘f .: ‘I *-
Condition STD Voltage
;> :
1 ‘Ig+i@ 540 mmHg (2l,.26 h.Hg, 72:O !Pa) Approx. 2.8 V
No voltage
S/W ON
750 mmHg (29.53 in.Hg, 100.0 kPa) Approx. 3.8 V
To Air Flow Meter-
Her Flow Meter ECU
1 HAC
bE2.
2,000 0 Alitude (m)
1,000
FI1995Fil99
.,~ .._ .,_
I... ~ _ . . ., , .
,.;_
itage between ECU terminal HAC and E2.
.,, ”
Check that there is voltage between ECU tdrminal VC and
body ground. (IG S/W ON)
,..
.._
Refer to No. 2.
(See page FI-43)
,. . . .
Voltmeter
EL . 1,
.v ‘_
E2 VC
b
FI199
Check wiring between ECU terminal El and body ground.
BAD
.
0 Check HAC sensor.
(See page FI-121) Repair or replace.
4
. ...<,
BAD OK
Replace HAC Check wiring between ECU and HAC
sensor. sensor.
OK BAD
Try another ECU.
I Repair or replace.

EFI SYSTEM - Ttpbleshooting with Volt/Ohmmeter (MS)
FL59
IO.
I Terminals
BATT - El
IG S/W - El
M-REL - El
2P-
I UTA - E2
3
US - E2
THA - E2
THW - E2
.B / IGF, IGT - El
9 ISCI
lSC4 - El
10
I W - El
ECU Terminals
Voltage at ECU Wiring Connectors
Condition STD Voltage ’
10 - 14
ignition S/W ON
10 - 14
Throttle valve open 10 - 14
4-6
Ignition S/W ON .
Throttle valve fully closed 0.1 - 1.0
Throttle valve fully open
4-5
4-6
Ignition S/W ON Measuring plate fully closed
4-5
Measuring plate fully open
0.02 - 0.08
Idling 2-4
3,000 rpm 0.3 - 1 .o
Ignition S/W ON 9
- 14 FI-66
Ignition S/W ON Intake air temperature 20°C (68°F) 1
-3
Ignition S/W ON
Coolant temperature 80°C (176°F) 0.1 - 1.0
Cranking
6 - 14
Idling 0.7 - 1.0
Ignition S/W ON
9 - 14
No trouble (“CHECK-ENGINE” warning light off) and
engine running 8 - 14 See page
FI-60
FI-6 1
FI-62
FI-63
FI-64
Fl-65
Fl-6.7
FI-68
FI-69
Fl-70
FI-7 1
Fl;72

FI-60 EFI SYSTEM - Troubleshooting with VoW6hmmeter (MS)
-.
No. Terminals Trouble Condition .
STD Voltage
BATT - El No voltage
lo- 14v
IO S/W - El
1 No voltage
Ignition switch ON lo-14v
M-REL - El No voltage Ignition switch ON
IO- 14v
B(B1) -El No voltage Ignition switch ON
10 - 14 v
-‘- Battery BATT ’
Bl
B
M-REL
IG S/W
El
@z
ECU
Fl275:
I Fl275,
ECU w
I Fl275
. BATT - El
@There is no voltage between ECU terminals BATT and El.
I
I
I 0
Check that there is voltage between ECU terminal BATT and
body ground.
I
NO OK
0 Check wiring between ECU terminal El and body
ground.
BAD
Replace.
1 OK
Check wiring between ECU terminal BAD
and battery. w Repair or replace.

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MS)
FI-63
No. 1 Terminals 1 Trouble 1
Condition S-m Vnlttlnq --- ‘-‘-P-~
IDL
- E2 Throttle valve open
10 - 14 v
vcc - E2
2
No voltage Ignition 4-6V
switch ON
VTA - E2 Throttle valve fully closed 0.1 - l.OV
Throttle valve fully open
4-!iv
ECU .s
r
Fl136
I . IDL - E2
ECU
I ECU
I Y ,
F12767
0 There is no voltage between ECU terminals IDL and E2.
(IO S/W ON) (Throttle valve open)
I
1
0 Check that there is voltage between ECU terminal B (Bl) and
body ground.
(IO S/W ON)
NO
OK
, 1
I I Check wiring between ECU terminal El and body
I
1 ground.
OK
Try another ECU. 1
BAD
I Repair or replace.
I i
t
Refer to No. 1. BAD
(See page FI-62) p Replace or repair.
t
OK
, t
I@ Check throttle position sensor, ]
BAD
BAD
OK
*
Replace or repair Check wiring between ECU and
throttle position sensor. throttle position sensor.
1
OK
Try another ECU.
‘!
t