1987 TOYOTA CELICA Service Repair Manual

,. . .
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.

- Fiel System
FI-77
Fl199
(p) Stop the engine. Check that the fuel pressure
remains above I.5 kg/cm2 (21 psi, 147 kPa) for 5
minutes after the engine is turned off.
If pressure is not as specified, check the fuel pump,
pressure regulator and/or injectors.
CqI After checking fuel pressure, disconnect the battery
negative (-1 cable and carefully remove the SST to
prevent gasoline from splashing.
SST 09268-45012
(r) Install cold start injector tube.
(7M-GE)
l Reconnect the cold start injector tube with new
gaskets and union bolt to the delivery pipe.
Torque: 300 kg-cm (22 ft-lb, 29 Nsm)
0 Connect the wiring connector to the cold start
injector.
(7M-GTE)
0 Remove the two bolts and cold start injector with
gasket.
0 Connect the cold start injector connector.
l Install the cold start injector tube with new four
gaskets and two union bolts.
Torque:
Delivery pipe side
300 kg-cm
(22 ft-lb, 29 N.m)
Cold start injector side 180 kg-cm
(13 ft-lb, 18 N.m)
(s) Check for fuel leakage.

?I-78 EFI SYSTEM - Fuel Systeti
-_
REMOVAL OF FUEL PUMP
._
Fuel Pump Bracket
Filter
. i’
@-Rubber Cushion
+ Non-reusable part
FI166
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL
OF BATTERY
2. DRAIN GASOLINE FROM FUEL TANK
WARNING: Do not smoke or work near an open
flame when working on the fuel pump.
3.
4. REMOVE FUEL TANK
REMOVE FUEL PUMP BRACKET FROM FUEL TANK
(a) Remove the screws.
(b) Pull out the fuel pump bracket.
REMOVE FUEL PUMP FROM FUEL PUMP BRACKET
(a) Remove the two nuts and disconnect the wires from
the fuel pump.
(b) Pull off the lower side of the fuel pump from the
bracket.
(c) Remove the fuel pump from the fuel hose.