TOYOTA CELICA 1987 Service Repair Manual

EFI SYSTEM - Air Induction System
FI-107
. .
2. CONNECT THROTTLE POSITION SENSOR
CONNiXTOR .-
3. CONNECT VACUUM HOSES
4. INSTALL AiR INTAKE CONNECTOR
:
(See steps 13 to 15 on page EM-141
5. INSTALL ACCELERATOR CONNECTING ROD
6. REFILL WITH COOLANT

FI-108 EFI SYSTEM - Air Induction System
Idle Speed Control (EC) Valve
Rotor
Bl
Q-4
*
0
Rotor
m B2 s2. s4
Fll99lFH6.
,
ON-VEHICLE INSPECTION
CHECK FOR OPERATING SOUND FROM ISC VALVE
Check that there’ is a clicking sound immediately after
stopping the engine.
REMOVAL OF ISC VALVE
1. DRAIN COOLANT
2. DISCONNECT ISC VALVE CONNECTOR
3. DISCONNECT TWO WATER BY-PASS AND AIR
HOSES FROM ISC VALVE
4. REMOVE ISC VALVE
(a) Remove the two bolts.
(b)
Remove ISC valve and gasket.
(cd (7M-GTE)
Remove the seal washer and check valve from the
intake chamber.

EFI SYSTEM - Air Induction System
FI-‘I 09
-.
!
INSPECTION OF ISC VALVE
1. INSPECT RESISTANCE OF ISC VALVE
Using an ohmmeter, measure the resistance between ter-
minal B~l - Sl or S3 and 82 - S2 or S4.
Resistance: Bl -SlorS3 PO-3051
B2-S2orS4, lo-30n
If resistance is not as specified, replace the ISC valve.
2. INSPECT OPERATION OF ISC VALVE
(a) Apply battery voltage to terminals Bl and 82 and
while repeatedly grounding Sl - S2 - 53 - S4 -
S 1 in sequence,.. check that the valve moves toward
the closed position.
(b) Apply battery voltage to terminals Bl and 82 and
while repeatedly grounding S4 - S3 - S2 - Sl -
S4 in sequence, check that the valve moves toward
the open position.
INSPECTION OF CHECK VALVE (7M-GTE only)
INSPECT CHECK VALVE
Inspect the check valve for damage and the diaphragm for
cracks.
If necessary, replace the check valve.
INSTALLATION OF ISC VALVE
1. INSTAiL ISC VALVE
(a) (TM-GTE)
Install the check valve and the seal washer as shown
in the illustration, to the intake chamber.
(b) Install a new gasket to the intake manifold.
(cl Install the ISC valve with the two bolts and one nut.
Torque:
130 kg-cm (9 ft-lb, 13 N-m)
2. INSTALL All? AND TWO WATER BY-PASS HOSES TO
ISC VALVE
3. CONNECT ISC VALVE CONNECTOR
4. REFILL WITH COOLANT

FI-110
EFI SYSTEM - Electronic Control System
‘ELECTRONIC CONTROL SYSTEM
._
Lkation of Electronic Control Parts
A
7M-GE
Fuel Pump Solenoid
olenoid Resistor
VSV (fo: FPUK

,r,l-EFI Main Relay
. .
7M-GTE _
Cold Start Injector
SV (for EGR)
Solenoid Resistor

EFI SYSTEM - Electronic Control System FI-111
Location of Electronic- Coritrol Parts (Cont’d)
LHD
RHO
EFI Main Relay
Fuel Pump Relay
Check Connector’
Cold Start lniector
Water Tern;. Switch
VSV (for FPU) >id Resistor
Check/Cohor
/ I Circuit Opening R?l?y,Y
Cold Start Injector
Time Switch
Water Tern;
Switch Resistor
Fuel Pump Solenoid Resistor
I4 yw
VSV (for FPU)
Solenoih Resistor
Fl28
FIZ I19 I 120

12 EFI SYSTEM - Electronic Control Svstem
EFI Main Relay
. .
Fusible Link EFI Main Relay
AM2 30A
(MA)
Fusible (MA) MAIN 2.OL
Link
Ig (MS) MAIN l.OY ECU
.
FBI (Bi)
tB (B)
M-REL
El
Jo continuity Continuity
INSPECTION OF EFI MAIN RELAY
n Inl
r-----x n i?d 1. INSPECT RELAY CONTINUITY
(a) Using an ohmmeter, check that there is continuity
between terminals 1 and 3:
(b) Check that there is no continuity between terminals 2
and 4.
‘3 BE0009
Continuity
Battery 2.
If continuity is not as specified, replace the relay.
INSPECT RELAY OPERATION
(a) Apply battery voltage across terminals 1 and 3.
(b) Check that there is continuity between terminals 2
and 4.
If operation is not as specified, replace the relay.

EFI SYSTEM - Electronic Control System
FI-113
hrcuit Opening Relay
._
Check Connector
Fuel Pump Switch
(Air Flow Meter)
-. To Fuel Pump
Relay
I
I r-l ~1 Continuity ’ INSPECTION OF CIRCUIT OPENING RELAY
i-----E
1.
INSPECT RELAY CONTINUITY
(a) Using an ohmmeter, check that there is continuity
between terminals STA and El.
(b) Check that there is continuity between terminals B
and FC.
(c) Check that there is no continuity between terminals B
and FP.
If continuity is not as specified, replace the relay.
2.
INSPECT RELAY OPERATION
(a) Apply battery voltage across terminals STA and El.
(b) Using an ohmmeter, check that there is continuity
between terminals B and FP.
(c) Apply battery voltage across terminals B and FC.
(d) Check that there is continuity between terminals B
and FP.
If operation is not as specified, replace the relay.

-114 EFI SYSTEM - Electronic Control Sistem 7.
Solenoid Resistor
. .
ECU
G S/W
No. 10
No. 20
No. 30
EOl
E02
1 INSPECTION OF SOLENOID RESISTOR
INSPECT RESISTANCE OF SOLENOID RESISTOR
Using an ohmmeter, measure the resistance between +B
and other terminals.
Resistance: 3 n each
If the resistance is not as specified, replace the resistor.
No.‘20 Nci. 30
l=l257~

EFI SYSTEM
- Electronic Co?troi System
FI-116
To ignition Switch
(ST11
1 To ECU (STA)
-- : Cold Start Injector Time Switch
._
To ECi
Time Switch
FH37
INSPECTION OF COLD START INJECTOR
TIME SWITCH
1. INSPECT RESISTANCE OF COLD START INJECTOR
TIME SWITCH
(a) Disconnect the connector.
(b) Using an ohmmeter, measure the resistance between
each terminal.
Resistance:
w/ TWC
STA - STJ
25 - 50 Cl below
15°C (59°F)
60 - 85 Cl above
30~ (860~)
STA - Ground 25 - 85 Q
w/o TWC
STA - STJ
20 - 40 n below
30°C (86OFI
40 - 60 i2 above
40°C (104’FI
STA - Ground 20 - 80 $I
If the resistance is not as specified, replace the switch.
2.
IF NECESSARY, REPLACE COLD START INJECTlbN
TIME SWITCH
(a) Drain the coolant.
(b) Using SST, replace the switch with a new gasket.
SST 09814-20010
Torque: 300 kg-cm (22 f&lb, 29 Narn)
(cl Refill with coolant.

FL1 16 EFI SYSTEM - Electronic Con’trol System
Water Temperature Sensor
._
WATER TEMP. SENSOR
I Thermistor
, I I I I
I -20 0 20 40 60 80 100 120
(-4) (32) (68)(104)(140)1176)(212) (248)
TEMPERATURE “C IoF)
Fl0516FiO7C
INSPECTION OF WATER TEMPERATURE
SENSOR
INSPECT RESISTANCE OF WATER TEMPERATURE
SENSOR
Using an ohmmeter, measure the resistance between both
terminals.
Resistance: Refer to chart.
If the.resistance is not as specified, replace the water tem-
perature sensor.