check engine TOYOTA CELICA 1987 Service Owner's Guide

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

EFI SYSTEM - Fuel System
-.
Injectors --

Coil
1 ON-VEHICLE tNSPkTlON
1.
2. CHECK INJECToR OPERATION
Check operation sound from each injector.
(a) With the engine running or cranking, use a sound
scope to check that there is normal operating noise in
proportion to engine rpm.
(b) If you have no sound scope, you can check the injec-
tor transmission operation with your finger.
If no sound or an unusual sound is heard, check the wiring
connector, injector, resistor or injection signal from the
ECU.
INSPECT RESISTANCE OF INJECTOR
(a) Disconnect the injector connector.
(b) Using an ohmmeter, measure the resistance of both
terminals.
Resistance:
7M-GE 1.8 - 3.4 n
7M-GTE 2.0 - 3.8 Q
If the resistance is not as specified, replace the injector.
(c) Reconnect the injector connector.

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

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.

22 EFI &STEM - Electronic Control S&m
El 7 Oxygen S,ensor (-WI TWC)
INSPECTrON OF OXYGEN SENSOR
1. WARM UP ENGINE
Allow the engine to reach normal operating temperature.
2. INSPECT FEEDBACK VOLTiGE (VFI
Connect the positive (+I probe of a voltmeter to terminals
n1711 VF of the check connector, and negative (-1 probe to ter-
minal El. Perfom the test as follows.
Narm up Oxygen sensor ‘with the engine at
!,500 rpm for approx. 90 seconds.
I
1
short termina!s T and El of the check connector.
4nd maintain engine speed at 2,560 ‘i-pm.
- / (,,,;,,.,,,,
i .
Check the number of times the voltmeter meedle fluctuates in 1 Oseconds. Zero again 1 After replacing
I the oxygen sensor
i ,. ., ;
: . .
Less than 8 times
t. ., .,
Warm up the oxygen sensor with the engine at
,,I
2,500 rpm for approx. 90 seconds. And maintain
engine at 2,500 rpm.
’
I
c
Check that the number of times the voltmeter
needle fluctuates in 10 seconds,
;- 8 times or more
Zero
Leis’~than 8 times
c
Unshort terminals T and El of the check connector.
And maintain engine speed at 2,500 rpm.
Measure voltaae between terminals VF and El.
I
More than 0 V t
Read and record diagnostic codes. (See page FI-30)
I I
Normal code
and code 21 Malfunction code(s)
(ex. code 21)
Repair the relevent diagnostic code.
ONTINUED ON PAGE FI-123 !ero