1987 TOYOTA CELICA engine

EFI SYSTEM - Troub!eshoo$ng with Volt/Ohmmeter (MA)
. .
JO. Terminals
12 W - El Trouble
No voltage Condition
Nq @uble, (“CHECK” engine warning
light off) and engine running STD Voltage
s-14v
FUSE
GAUGE 7.5A
i
f “CHECK ENGINE”
Wahiing Light
Combination Mete W
El
FlO7
Joltmeter
EL v “_
Fl1251
1
Voltmeter
FH25C
. .
~0 There is no voltage between ECU terminals W and El.
(Idlin$
,
.
I 0
Check that there is voltage between ECU terminal W and
I
hod
Q;
0 Check wiring between ECU terminal El and body
Check GAUGE fuse (7.5A) and “CHECK
ENGINE” warning light.
I I
I Repair or replace.
I
1
Check wiring between ECU terminal BAD
*
W and fuse. Repair or replace.
I I
1 I

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (MS) FI-57
-.
TROUBLESHOOTING WITH
VOLT/OHMMETER (MS)
NOTE: The following troubleshooting pro-
cedures are designed for inspection of each separ-
ate system, and therefore the actual procedure
may vary somewhat.. However, troubleshooting
should be performed refering to .the inspection
methods described in this manual. .._
Before beginning,inspection, it is best to first make
a simple check of the fuses, fusible links and the The following troubleshooting procedures are
based on the supposition that the trouble ‘lies in
either a short or open circuit in a component out-
side the computer or a short circuit within the
computer.
If engine trouble occurs even though proper.
operating voltage is detected in the computer con-
nector, then it can be assumed that the ECU is
faulty and should be replaced.
LOCATIoN- OF FUSES AND FUSIBLE LINKS
condition of the connectors.
Junction Block and Relay Block Cassettes

EFI SYSTEM - Ttpbleshooting with Volt/Ohmmeter (MS)
FL59
IO.
I Terminals
BATT - El
IG S/W - El
M-REL - El
2P-
I UTA - E2
3
US - E2
THA - E2
THW - E2
.B / IGF, IGT - El
9 ISCI
lSC4 - El
10
I W - El
ECU Terminals
Voltage at ECU Wiring Connectors
Condition STD Voltage ’
10 - 14
ignition S/W ON
10 - 14
Throttle valve open 10 - 14
4-6
Ignition S/W ON .
Throttle valve fully closed 0.1 - 1.0
Throttle valve fully open
4-5
4-6
Ignition S/W ON Measuring plate fully closed
4-5
Measuring plate fully open
0.02 - 0.08
Idling 2-4
3,000 rpm 0.3 - 1 .o
Ignition S/W ON 9
- 14 FI-66
Ignition S/W ON Intake air temperature 20°C (68°F) 1
-3
Ignition S/W ON
Coolant temperature 80°C (176°F) 0.1 - 1.0
Cranking
6 - 14
Idling 0.7 - 1.0
Ignition S/W ON
9 - 14
No trouble (“CHECK-ENGINE” warning light off) and
engine running 8 - 14 See page
FI-60
FI-6 1
FI-62
FI-63
FI-64
Fl-65
Fl-6.7
FI-68
FI-69
Fl-70
FI-7 1
Fl;72

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.

‘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.

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.

Fl-82 EFI SYSTEM - Fuel System
(d) Put a container under the injector.
(e) Reconnect the battery negative (-1 terminal.
(f) Turn the ignition switch ON.
NOTE: Do not start the engine.
Fl298:
!g) Using a service wire, short terminals +B and FP of
the check connector.
CHECK CONNECTOR LOCATION:
See pages ‘FI-j 10, 111
(h) Connect the test probes of the SST (wire) to the bat-
tery, and check that the fuel spray is as shown.
SST 09842-30050
CAUTION: Perform this check within the shortest
possible time.
2. INSPECT LEAKAGE
(a) In the condition above, disconnect the test probes of
SST (wire) from the battery and check fuel leakage
from the injector.
SST 09842-30050
Fuel drop: One drop or less per minute
(b) Disconnect the battery negative (-1 cable.
(c) Remove SST and the service wire.
SST 09268-41045 and 09842-30050