TOYOTA CELICA 1987 Service Repair Manual

No. Terminals Trouble Condition STD Voltage
I I I I I
5 THA - E2
I No voltage ON
I Ignition switch Intake air temperature 20°C
(66°F) 1 -3v
0 ”
0 6
L -
,’ E2 (B?)
(5E2
( THA
Air Temp. Sensor
(Air Flow Meter) o El
ECU
fl275'
Air Flow Meter ’
0 There is no voltage between ECU terminals THA and E2.
(IG S/W ON)
I
0 Check that there is voltage between ECU terminal B (Bl 1 and
body ground. (IG S/W ON)
OK NO
Refer to No. 1.
(See page FI-62)
1
Check wiring between ECU terminal El and body ground.
OK
0 Check air temp. sensor.
(See page FI-96) Repair or replace.
c
BAD
OK
Replace air frow Check wiring between ECU and air
meter. temp. sensor.
OK BAD
Try another ECU.
I 1 Repair or replace. 1

EFI SYSTEM
- Troubleshooting with Voltkhmmeter (MS)
-.
No. 1
Terminals
I Trouble
I Condition ._
I STD Voltage
6 THW - E2 .No voltage Ignition switch Coolant temperature 80°C
ON (, 760F) 0.1 - 1.0 v
Water Temp. Sensor
. ECU
5 031)
THW
E2
:1
ECU I terminals THW and E2.
I
0 There is no voltage between ECU
(IG S/W ON)
I-
:.
0 Check that there is voltage between ECU terminal B (61) and
body ground. (IG S/W ON) -
1
OK NO
I
I 8 1
I
Refer to No. 1.
(See page FL62)
I
I I . -
I
Check wiring between ECU terminal El and body ground.
I BAD
Check water temp. sensor.
Repair or replace.
BAD
Replace water
temp. sensor. OK
Check wiring between ECU and water
I temp. sensor.
OK BAD
Try another ECU. 1 Repair or replace. 1

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MS)
FI-69
No. 1 Terminals 1 Trouble 1 Coridition
1 .STD Voltage
7 1 STA - El No voltage Cranking
6-14V
Fusible Link
AM1 40A
ALT 1OOA
r
Battery
1 Ignition Switch
l~ol Fuse
AMIj “V
lsT’ST 7.5A Neutral Start To Circu
,Opening
Relay
,
(M/T)
,
I I
Fusible
Link
% MAIN
Starter
Relay ECU
STA
El
ECU
Ft275!
0 There is no voltage between ECU terminals STA and El.
(IO S/W START)
I
Check starter OK
operation.
BAD Check &ring between ECU terminal STA
and ignition switch terminal STI.
OK BAD
Repair or replace.
t
0 Check wiring between ECU terminal El and body
ground.
v OK
Try another ECU. BAD
Repair or replace.
Check fusible links, battery, wiring,
ignition switch and neutral start BAD
c Repair or replace.
switch.
I
OK
0 Check that there is voltage at STA (50) terminal of starter.
OG S/W START) STD voltage: 6 - 14 V
OK
NO
c
Check starter. Check wiring between ignition switch
terminal ST1 and starter terminal STA (50).

. .
No. Terminals Trouble Condition
STD Voltage
8 IGT, IGF - El No voltage Idling -- 0.7-l.OV
Ignition SW
Fusible
a AM2
Link 30A EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MS)
F12771
Y , F1277
ECU 8
&z
F12755
0 There is no voltage between ECU terminals IGT and El.
(Idling)
0 Check that there is voltage between ECU terminal IGT and
body ground. (Idling)
I
NO OK
0 Check wiring between ECU BAD Repair or
terminal El .and body ground. replace.
I OK
1 Try another ECU.
I
Check fusible link and ignition
switch. BAD
BAD
Repair or replace.
I I I
I OK I T
1 I I
Check wiring between ECU and
battery.
I BAD
c Repair or replace.
BAD
Repair or replace.
I
I 1 I

,. . .
EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MS)
FL71
No. Terminals
Trouble Condition
9 ISCl --Isc4
- El No voltage Ignition switch ON STD Voltage
9-14v
Fusible
Link
Battery EFI Main Relay
ISC Valve ECU
Fuse
EFI 15A
MAIN 1 .OY
A
=
Fl291:
B
81
’ M-REL
0 There is no voltage between ECU terminals ISCl - ISC4
and El. (10 S/W ON)
,
1
Check that there is voltage between ECU terminal B (Bl) and
@bod;TYn.. (10 S/W ON)
, Re~e!t~~o, ,. I
(See page FI-62) 1
I Check wiring between ECU terminal El and body ground.
I OK
I v
I 1
f
8 Check ISV valve.
(See page FI-108) I I Repair or replace.
I
I
I I I I 1
Check wiring between ECU and EFl
piii=-j I/
I I
I I 1 1 Try another ECU, 1 Repair or replace. 1 L
I I I

72 EFI SYSTEM ‘- Troubleshooting with Volt/Ohmmeter (MS)
40.
10 Terminals
W - El
. .
Trouble ,, Condition
No voltage _ No trouble (“CHECK engine warning
>‘Iight om and engine running STD Voltage
a-14v
. FUSE
GAUGE 7.5A
f$.; ..
w-im~~
S&INE-
Warning Light ECU
I
W
El
F12772
ECU
__
There is no voltage between ECU terminals W and El. !:, ;,:;:,p i, @
.,..I fldling)
1
,..
‘CD Check that there is voltage between ECU terminal W and
bodv around. ’ 1
_ -
I
NO OK
0 Check wiring between ECU terminal El and body
ground:..
*
OK BAD
Try another ECU.
I. Repair or replace.
: . i’ F1277
d% F12755
Check GAUGE fuse (7.5A) and “CHECK
~ ENGINE” warning light.
,. r
OK BAD
Repair or replace.
t Fuse blows again
Check wiring between ECU terminal
BAD
W and fuse. Repair or replace.

EFI SYSTEM - Fuel System FI-73
FUEL SYSTEM
Fuel Pump
Check Valve-------,
n!
Relief Valved
Bearing
Brush OUTLET INLET
Armature
I Filter I
Rubber Cushion
ECU
Fusible Link Ignition Switch
1 G S/W
3ATT
tB1 (B’l
I-B (B)
WREL
FPR
9’
FM-CT
El 1 AM2 30A 1 AM2-IG2 IGN
(MA)
Fusible Link Fuse
‘Q-p
I EFI Main Relay
fc4 r
MAIN I%? (MS) EFi 15A
Ignition
Fusible Link Switch 1
‘El
I
m AM1 ST1
AM1 40A
” (MA)
(MS) Check
Connector
Circuit
usible
ink
IAIN 2.0
I
F
L
(Air Flow Meter) (MA)
Battery1
T
ALT ,,A#, w
(M/T)
1
(MA/7M-GTE)
1 OOA
(MS)
= 1 OOA
FlO491 Fl14

‘I-74 EFI SYSTEM - Fuel System
Fl169
ON-VEHICLE INSPECTlOiU
1.
INSPECT FUEL PUMP OPERATION
(a) Turn the ignition switch to ON. :
NOTE: Do not start the engine.
(b) Using a service wire, short circuit the fuel pump
check terminals +B and FP of the check connector.
CHECK CONNECTOR LOCATION:
See pages FI-1 10, 111
(c) Check that there is pressure in the fuel return hose.
NOTE: At this time, you will hear fuel pressure noise.
(d) Remove the service wire.
(el Turn the ignition switch OFF.
If there is no pressure, check the following parts.
i Fusible links
0 Fuse
0 EFI main relay
0 Fuel pump
0 Wiring connections
2. INSPECT FUEL PRESSURE
(a) Check that battery voltage is above 11 bolts.
(b) Disconnect the cable from the negative (-) terminal
of the battery.
(c) Remove the cold start injector tube.
(7M-GE)
0 Disconnect the wiring connector from the cold
start injector.

EFI SYSTEM - Fuel System
FI-75
0 Place a suitable container or shop towel under the
cold start injector tube.
0 Slowly loosen the union bolt of the cold start injec-
tor tube and remove the bolt and two gaskets from
the delivery pipe.
(7M-GTE)
l Place a suitable container or shop towel under the
cold start injector.
l Slow’ly loosen the union bolt of the cold start injec-
tor tube and remove the bohand two gaskets from
the cold. start injector.
0 Remove the union bolt, fuel tube and two gaskets.
0 Remove the two bolts and disconnect the cold
start injector with gasket.
0 Disconnect the cold start injector connector.
l Install the gasket and cold start injector with the
bolts.
Torque:
55 kg-cm (48 in.-lb, 5.4 N*m),
(d) Install SST(pressure gauge) to the delivery pipe with
new gaskets and union bolt, as shown in the figure.
SST 09268-45012
Torque: 300 kg-cm (22 f&lb, 29 N-m)
(e) Wipe off any splattered gasoline.
(f) Reconnect the battery negative (-1 cable.

FI-76 EFI SYSTEM - Fuel S$stem
:’ ‘=-
r
Fl165
1
(g) Using a service wire, short circuit the fuel pump
check terminals FP and +B of the check connector.
CHECK CONNECTOR LOCATION:
See pages FI-110, 111
(h) Turn the ignition switch ON.
6) Measure the fuel pressure.
Fuel pressure: 2.3 - 2.8 kg/cm2
(33 - 40 psi, 226 - 275 kPa)
If pressure is high, replace the pressure regulator.
If pressure is low, check the following parts:
0 Fuel hoses and connection
0 Fuel pump
l Fuel filter
0 Pressure regulator
(j) Remove the service wire from the check connector.
(k) Start the engine.
(I) Disconnect the vacuum sensing hose from the
pressure regulator and plug hose end.
(m) Measure the fuel pressure at idling.
Fuel pressure: 2.3 - 2.8 kg/cm2
(33 - 40 psi, 226 - 275 kPa)
(r-r) Reconnect the vacuum sensing hose to the pressure
regulator.
10) Measure the fuel pressure at idling.
Fuel pressure: 1.6 - 2.1 kg/cm2
(23 - 30 psi, 157 - 206 kPa)
If pressure is not as specified, check the vacuum sensing
hose and pressure regulator.