1987 TOYOTA CELICA air condition

;I-42 EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MA)
NO, Terminals
IDL - E2 Trouble Condition ..
Throttle valve open STD Voltage
10 - 14 v
2 }-I No voltage / s$t;;N -
Throttle valve fully closed o.‘: I;,; v
I VTA - E2
I I Throttle valve fully c
I I I I
Throttle Position Sensor
Ei
I IDL
VTA
VC
El 4-5v
I
Voltmeter
R102,
FlO31
l IDL - E2
0 There is no voltage between ECU terminals IDL and E2.
(IO S/W ON) (Throttle valve open)
c
I
0 Check that there is voltage between ECU terminal +B (+Bl)
and body ground. (IO S/W ON)
c h
, 1
1 OK ’
1 1 Check wiring between ECU terminal El and body ground.1
t
Refer to No. 1.
(See page FI-41)
I
BAD
7
- Replace or repair.
1
b
OK
,
1
I@ Check throttle position sensor. 1 BAD
1
I BAD OK
.
Check wiring between ECU and
throttle position sensor.
1

WI4 EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MA)
No. Terminals Trouble Condition --
ST0 Voltage
I VC - E2
I
No voltage
vs - E2
‘7M-GE only 4-6V
Ignition
S/W ON Measuring plate fully closed 4-6V
Measuring plate fully open
0.02 - 0.08 V
Idling -.
2-4V
3,000 rpm
0.3 - 1 .o v
ECU
Air flow meter
Voltmeter
E3lL V’
Voltmeter
Air Flow Meter (j)
0 There is no voltage between ECU terminals VC or VS and E2.
IIG s/w ON)
i
1
0 Check that there is voltage between ECU terminal +B (+Bl)
and body ground. (IG S/W ON)
OK
NO
,
Refer to No. 1.
(See page FI-41)
I t 1 Check wiring between ECU terminal El and body ground. I 1
I OK
0 Check air flow meter.
(See page FI-96) 1 Repair or replace.
Check wiring between ECU and air
flow meter.
OK
Try another ECU. Repair or replace.

MO.
‘4 -
EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MA) FI-45
Terminals
Trouble
Condition
STD Voltage
KS - Body Ignition’S/W ON
4-6V
ground
No voltage Cranking or running
2-4V
I vc - Body
ground Ignition S/W ON
‘7M-GTE only
Air Flow Meter
_ Ivc ECU,
z31,
VC
KS
r El
FFA7m F1257i
Oh
. KS - Body ground
I 0
There is no voltage between ECU terminals KS and body
ground. (IO S/W ON)
I 0
Check that there is voltage between
and body ground. (IG S/W ON)
OK
i
0
Check wiring between ECU terminal El and body
ground.
OK
BAD
L
I
Check air flow meter.
(See page FL981
I I Repair or replace.
I
Check wiring between ECU and air
BAD
Try another ECU.
Repair or replace.

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MA)
JO. Terminals Trouble Condition
S-m Voltage
No. IO
EOl
5 No. 20 -
E02 No voltage Ignition switch ON 9-14v
No. 30
Fusible
Link
8 MAIN 2.OL
-T
T
Battery f
-
I
= -“No. 10
I c
FIZE
Ignition Switch ECU
No. 2C
Voltmeter
A Solenoid Resistor
nr R?r
0 There is no voltage between ECU terminal No. 10, No. 20
and/or No. 30 and EOl or E02. (IO S/W ON)
1.
0 Check that there is specified voltage between resistor terminal
+B and body ground. STD voltaae: 9 - 14 V
1 NO 1
.
Check fuse, fusible links BAD
and ignition switch. - Repair or replace.
I i
1 OK I
I I ,
1
Check wiring between
resistor and battery. BAD
- Repair or replace.
Check that there is specified voltage between resistor terminal
@ (No. IO, No. 20 or No. 30) and body ground.
j ‘,.“.““!
I 0
Check resistance of magnetic coil in
each lniector. I 1 Replace resistor.
I
I . J I I

FI-48 EFI SYSTEM - Troubleshooting with Volt/Ohmmeter.(MA)
I
7M-GE
@
.-
Air Flow Meter
UO.
6 Terminals
THA - E2 Trouble Condition ._ ST0 Voltage
No voltage IG S/W ON Intake air temperature 20°C (68°F) 1 -3v
IM-GE
1 I Air Temp. Sensor
(Air Flow Meter) ECU
+B
(+Bl)
E2
THA
lE1 7M-GTE
ir Temp. Sensor
iir Flow Meter)
1
I THA
E2
I
ECU
CB
-i-B11
l-HA
0 There is no voltage between ECU terminals THA and E2.
(IG S/W ON)
1
Fl1636
‘M-GTE
Ohmmeter Air Flow Meter
I/ 1” THA / Check that there is voltage between ECU terminal +B (+Bl) and
body ground. (IO S/W ON)
I
OK NO
Refer to No. 1.
(See page FI-4 I)
Check wiring between ECU terminal El and body ground.
OK
t
I I I
0 Check air temp. sensor.
(See pages FI-96, 98)
L * 1 Repair or replace. ]
I
I
BAD OK
Replace air flow Check wiring between ECU and air
meter. temp. sensor.
L k
OK
Try another ECU. Repair or replace.

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MA) Fl-49
-.
No.
Terminals Trouble
Condition
STD Voltage
7 THW - E2 No voltage ignition switch
Coolant temperature 80°C
ON (1780~) o-q - l-0 V
ECU
Water Temp. Sensor
. iB (+Bll
THW
E2
El
Jf /
Voltmeter
n F1031:
1
0 There is no voltage between ECU terminals THW and E2.
(IO S/W ON)
1 i
CD Check that there is voltage between ECU terminal +B (+Bl) and
body ground. (IG S/W ON)
1
OK
NO
Refer to No. 1.
(See page FI-41)
Check wiring between ECU terminal El and body ground.
OK
, 1
0 Check water temp. sensor.
(See page FI-1 161
I I
Try another ECU. OK
Check wiring between ECU and water
temp. sensor.
OK BAD
Repair or replace.

1-50
No.
6 EFI SYSTEM - Troub&hooting with Volt/Ohmmeter (MA)
Terminals Trouble Condition STD Voltage
STA - El No voltage Cranking 6-14V
Fusible Link
ALT
7M-GE.
I.258
7M-GTE
1 OOA
MAIN 2.01
Battery (M/T)
Fusible Ignition
Link Switch
Idal :
Neutral Start S/W
(A/T)
To Circuit Starter
a
,ening Relay (STAI ECU
3TA ,
El
loltmeter
lF!L V’
FlO3:
‘ottmeter 0
Starter
0 There is no voltage between ECU terminals STA and .El .
II0 S/W START)
Check starter OK Check wiring between ECU terminal STA
operation. and ignition switch terminal STI.
L
BAD OK
I BAD
I 1
I
1 Repair or replace.
I I 1
I
I
0 Check wiring between ECU terminal El and body
around.
I
Check fusible links, battery, wiring,
ignition switch and neutral start
switch. BAD
e Repair or replace.
OK
’
I
0
Check that there is voltage at STA (50) terminal of starter.
(IO S/W START) STD voltage: 6 - 14 V
OK NO
I
1 Check starter. 1 Check wiring between ignition switch
terminal ST 1 and starter terminal STA (50).
L

EFI SYSTEM -. Troubleshooting with Volt/Ohmmeter (MA) FI-51
I-
i’
No. Terminals
Trouble Condition
STD Voltage
9 IGT, IGF - El
No voltage Idling
0.7 - 1.0 v
ECU
Fusible
Link
Battery Fusible Link Ignition Switch
AM2 30A
Tachometer
MAIN 2.OL
IGF
IGT
El
Voltmeter
EL It’-
Ohmmeter
0 There is no voltage between ECU terminals IGT and El.
(Idling)
I
I
0 Check that there is voltage between ECU terminal IGT and
body ground. (Idling)
I NO I OK
1
0 Check wiring between ECU BAD Repair or
terminal El and body ground. replace.
I
Check fusible links and ignition
switch. Repair or replace.
I
1 I I I
1 OK
Check distributor or cam position
BAD
sensor. (See pages IG- 11, 18) - Repair or replace.
I
1 OK
Check wiring between ECU and
battery. BAD
*-Repair or replace.
I
I I L I
1 OK
Repair or replace.