1987 TOYOTA CELICA engine

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

EFI SYSTEM - Electronic Control System FI-123
CONTINUED FROM PAGE FI-122
. .
t
8 (
epair the relevent diagnostic code.
Malfunction code(s)
(ex. code 21)
Read and record diagnostic codes. (See.page FL30)
Normal code
and code 21
t
Unshort terminals T and El of the check connector.
And maintain engine at 2,500 rpm.
I
I
M,easure voltage between terminals VF and El.
ov
t
1
Disconnect the PCV hose.
.
1 Measure voltage between terminals VF and El. 1
t
Replace the oxygen sensor Repair (Over lean) 5V
Disconnect the water temp. sensor connector and
connect resistor with resistance of 4 - 8 kS1 or
another coded water temp. sensor.
1
Short terminals T and El of the check connector.
I
I
Warm up the oxygen sensor with the engine at
I
1 2,500 rpm for approx. 90 seconds. And maintain 1
engine speed at 2,500 rpm.
Measure voltage between terminals VF and El.
I
I 5V

FI-126 EFI SYSTEM - Electronic Control &stem
Voltage at ECU W.jring Connectors (Cont’d)
.:. .I, ,,
Termlnals
Nov
10 EOI
No. 20 -
No. 30
E2
STD Voltage
6 L ,4-,: Condition
Ignition S/W ON
STA - El
ISCI
I -El
ISC4
,, : :
IGF, IGT - .E-1
*‘IGdA, lGd8 - El
:
‘2HAC - E2 6 - 14
9 - 14
-
I, .., ,i,
o .,.- i.;&& ,; ::
:,, ;;:3%
. . 1
Approx: 2.8
- Ignition S/w ON
Approlr. -3.6 L Cranking
,
Ignition S/W ON
Idling
Idling
540 mm Hg (21.26 in.Hg, 72.0 kPa)
750 mm Hg (I 29.53 in.Hg, 100.0 kPa)
W - El ‘: :g L ;I 4
: No trouble (“CHECK ENGINE” warning light off) and
engine running.
1
*3A/C - El .,. . :.llC 1~14 Air conditioning ON
>-
T - El 4A.6
Check connector T(TE1) - El not short
Ignition S/W ON
0 Check connector TfTEl) - El short
*3NSW (A/T) - El
*3N/C Uvl/TI -
El 0
Shift position P or N range
Ignition S/W ON
IO-14 Ex. P or N range
0: Clutch pedal not depressed
- Ignition S/W ON .
IO-14 Clutch pedal depressed
..-
I 1044 1 1 Defogger S/W OFF
I
“3DFG - El
“3LP - El 0
10 - 14
j) ‘. Ignition S/W ON
Defogger S/W ON
Headlight S/W OFF
Headlight S/W ON
*I 7M-GE only
*2 7M-GTE only
*3 MA only

Fl-128 EFI SYSTEM - Electronic Contpl SyStem
c
’ FlO54
Tachometer Fl114:
Fuel Cut RPM--
;INSPECTION OF FUEL CUT RPM
I.
2. WARM UP ENGINE
Allow the engine to reach normal operating temperature.
INSPECT FUEL CUT RPM
(a) Disconnect the connector from the throttle position
sensor.
(b) Short circuit terminals IDL and El on the wire con-
nector side.
(c) Gradually raise the engine rpm and check that there
is fluctuation the fuel cut and fuel return points.
NOTE: The vehicle should be stopped.
Fuel cut rpm:
1,800 rpm
Fuel return rpm: 1,200 rpm

-.
EM-1
I
ENGINE MECHANICAL .’ ../_ :.
F&e.
DESCRIPTION
. . . ..1........111.......~....~.~ E+ -;.’
TROUBLESHOOTING
. . . . . . . . . . . . . . . . n . ma m I. I.
EM-4’ ”
ENGINE TUNE-UP
. . . . . . . . . . . . ..~......~.......
COMPRESSION CHECK
s e . . . . . . . . . . . . . , . . . . . . .
TIMING BELT
,,,..,....................*.*...
EM-28
CYLINDER HEAD
. . . . . . . . . . . . . . ..*............
EM-37
CYLINDER BLOCK
1”1......1...............,..
EM-66