sensor TOYOTA CELICA 1987 Service Owner's Guide

;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.

jS EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MS)
-.
0
“B”
Fl294.
ECU
EFI SYSTEM CHECK PROCEDURE
._
PREPARATION
(a) Disconnect the connectors from the ECU.
(b) Remove the locks as shown in the illustration so that
the tester probe(s) can easily come in.
CAUTION: Pay attention to sections “A” and “B” in
the illustration which can be easily broken,
(c) Reconnect the connectors to the ECU.
’
NOTE:
0 Perform ail voltage measurements with the connectors
connected.
0 Verify that the battery voltage is 1 IV or above when
the ignition switch is at “ON”.
Using a voltmeter with high-impedance (10 kQ/V mihimum),
measure the voltage at each terminal of the wiring con-
nectors.
Terminals of ECU
rmbol Terminal Name Symbol Terminal Name
Symbol Terminal Name
EOI POWER GROUND NE DISTRIBUTOR ACPS A/C PRESSURE SWITCH
co2 POWER GROUND El COMPUTER GROUND SPD SPEEDOMETER
o. 10 INJECTOR (No. 1 and 4) VF CHECK CONNECTOR ECT ECT COMPUTER
o. 30 INJECTOR (No. 3 and 5)
GO DISTRIBUTOR ACR A/C COMPRESSOR
o. 20 INJECTOR (No. 2 and 6) TE2 CHECK CONNECTOR Ll
ECT COMPUTER
ELS DEFOGGER SWITCH
HEADLIGHT SWITCH TEl CHECK CONNECTOR L2
ECT COMPUTER
FPU VSV (FPU) KNK KNOCK SENSOR FPR FUEL PUMP RELAY
ACV VSV (A/R CONTROL) THW WATER TEMP. SENSOR L3 ECT COMPUTER
SC 1 ISC MOTOR NO. 1 COIL IDL
THROTTLE POSITION SENSOR W
WARNING LIGHT
IGT IGNITER THA AIR TEMP. SENSQR
M-REL EFI MAIN RELAY (COIL)
SC- ISC MOTOR NO. 2 COIL VTA THROlTLE POSITION SENSOR IG SiW IGNITION SWITCH 3
ISC3 ISC MOTOR NO. 3 COIL vs AIR FLOW METER Bl EFI MAIN RELAY
ISC4 ISC MOTOR NO. 4 COIL vcc AIR FLOW METER
THROTTLE POSITION SENSOR BATT BATTERY
IGF IGNITER E2
SENSOR GROUND B
EFI MAIN RELAY
G2 1 DISTRIBUTOR 1 STA 1 STARTER SWITCH
Gl 1 DISTRIBUTOR 1 NSW 1 NEUTRALSTARTSWITCH
ZU Terminals

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

FI-64 EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MS)
Fl162
. VCC - E2 .
0
There is no voltage between ECU terminals VCC and E2.
(IO S/W ON)
1
I
Check that there is voltage between ECU terminal B (Bl) and
body ground. II0 S/W ON1
OK
7
0 Check throttle position sensor. Refer to No. 1.
(See page FL102)
(See page FL62)
k
I OK
,
1 Repair or replace.‘ / Check wiring between ECU and throttle position sensor.
OK
t I , 1 BAD ,
1 Rwe;ix3;.or replace ]
Try another ECU.
l VTA - E2
I- I
0 There is no specified voltage at ECU terminals VTA and E2.
(IG S/W ON)
I
0 Check that there is voltage between ECU terminal VCC and E2.
(IO S/W ON)
I 1
I OK
I
[@ Check thrc1 BAD 4 Repair or replace. 1
I
1 OK I ‘1 4 Check wiring between ECU and
throttle position sensor.
I
1 OK BAD
- Repair or replace.
1 Try another ECU.
1
I

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 - Fuel System
-.
REMOVAL OF. INJECTOR
FI-87
1.
2.
3.
I A k DISCONNECT FOLLOWING CONNECTORS:
5.
8.
7. DISCONNECT CABLE FROM NEGATIVE TERMINAL
OF BATTERY
DRAIN COOLANT
DISCONNECT FOLLOWING HOSES:
l Water hoses from throttle body (7-M-GE) or water by-
pass pipe (‘IM-GTE)
0 Vacuum hoses from throttle body
0 ISC valve hoses from throttle body
0 Vacuum sensing hose from pressure regulator
0 Throttle position sensor connector
0 ISC valve connector
0 (‘IM-GE)
Cold start injector connector
REMOVE AIR INTAKE CONNECTOR
(7M-GE)
(a) Disconnect the air cleaner hose from the throttle
body.
(b) Remove the throttle body and air intake connector
brackets.
(c) Remove the four bolts and two nuts, intake connec-
tor and gasket.
(7M-GTE)
(See steps 1 to 3 on page EM-121
(‘IM-GTE)
REMOVE THROTTLE BODY (See page Fi-104)
REMOVE ISC VALVE
(a) Disconnect the No. 2 water by-pass hose from the
ISC valve.

EFI ,SY$TEM - Air Inducti& System
Throttle Body --
‘M-GE 7M-GTE
Throttle’Position
Sensor Throttle’ Position
fl1693 Flo504nl9f
.,.
,. ,F .,’
1 .ON:VEHtCLE INSPECTION
1. INSPECT THROTTLE BODY
(a) Check that the throttle linkage moves smoothly.
(b) Check the vacuum at each port.
0 Start the engine.
0 Check the vacuum with your finger.
Port
Purge
EGR
R
At idling
No vacuum
No vacuum
No vacuum
Other than idling
Vacuum
Vacuum
No vacuum

EFI SYSTEM - Air Inductioi System
PI-1 03
-
1 7M-GE
I 7M-GTE
d
c q-rEA
vc
1
I I
in-7.h
IDL VTA VC ’
s --I
2. INSPECT THROTTLE POSITION SENSOR
(a) Disconnectthe connector from the sensor.
(b) Insert a thickness gauge between the throttle stop
screw and stop lever.
(c) Using an ohmmeter, measure the resistance between
each terminal.
(d) Reconnect the sensor connector.
./ !’
REMOVAL OF THROTTLE BODY ‘.
/ (7M-GE)
1. DRAIN COOLANT FRdM THROTTLE BODY
2. REMOVE ACCELERATOR CONNECTING ROD
3. DISCONNECT VACUUM HOSES
4.
DISCONNECT NO. 2 AND NO. 3 WATER BY-PASS
HOSES
. 1 5. DISCONNECT THROTTLE POSITION SEI
7.
REMOVE THROTTLE BODY BRACKET(S)
6. REMOVE THROTTLE BODY
Remove the four bolts and throttle body with the gasket,

Fl-104 EFI SYSTEM - Air Induction Svstem
;i7M-GTE)
1.
2.
3. thAIhi COOLANT -kROM THROTTLE BODY
DISCONNECT ACCELERATOR CONNECTING ROD
REMOVE AIR INTAKE CONNECTOR
(See steps 1 to 3 on page EM-121
4.
5.
/A-.( /w /
Trottle Stop Screw
DISCONNECT VACUUM HOSES
*
DISCONNECT THROTTLE POSITION SENSOR
CONNECTOR
REMOVE THROTTLE BODY
(a) Disconnect the tko water by-pass hoses from the
ISC valve and water pipe.
(b) Remove the four bolts, throttle body and gasket.
(cl Remove the two water by-pass hoses.
INSPECTION OF THROTTLE BODY
1. CLEAN THROTTLE BODY
(a) Using a soft brush and carburetor cleaner, clean the
cast parts.
(d) Using compressed air, clean all passages and aper-
tures.
CAUTION: To prevent deterioration, do not clean the
throttle position sensor and dash pot.
2. INSPECT THROTTLE VALVE
Check that there is no clearance between the throttle stop
screw and throttle lever when the throttle valve is fully
closed.