sensor TOYOTA CELICA 1987 Service Service Manual

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EFI SYSTEM - Air Induction System
FI-105
FI188
Ft162!
FHE
3. INSPECT THROTTLE POSITION SENSOR
(See step 2 -on page Fl-103)
4. IF NECESSARY, ADJUST THROTTLE POSITION
SENSOR
(a) Loosen the two screws of the sensor.
fll6i
(b) Insert a 0.58 mm (0.0228 in.) (7M-GE) or 0.70 mm
(0.0276 in.) (XVI-GTE) thickness gauge, between the
throttle stop screw and lever.
(c) Connect the test probe of an ohmmeter to terminals
IDL and E.
(dd) Gradually turn the sensor clockwise until the ohm-
meter deflects, and secure the sensor with the two
screws.
(e) Recheck the continuity between terminals IDL and
E2.
I Clearance between
I
I lever and stop screw
I Continuity (IDL - E2)
I 7M-GE
! 7M-GTE
I
0.40 mm
I 0.50 mm
(0.0157 in.) (0.0197 in.) Continuity
0.75 mm 0.90 mm
(0.0295 in.1 lo.0354 in.) No continuity

FI-106 EFI SYSTEM - Air Induction S&m
-.
@ls,TAL&ATION OF THROTTLE BODY
(?M-QE)
I FIlW
I-
/
1.
2.
3.
4.
6.
6.
7.
6. INSTALL THROTTLE BODY
Install the gasket-and throttle body with the four bolts.
Torque: 130 kg-cm (9 ft-lb, 13 Narn)
CONNECT THROTTLE BODY BRACKET@
CONNECT AIR CLEANER HOSE
CONNECT THROTTLE POSITiON SENSOR
CONNECTOR
CONNECT VACUUM HOSES
CONNECT WATER HOSES
CONNECT ACCELERATOR CONNECTING ROD
REFILL WITH COOLANT
(‘/M-GTE)
1. INSTALL THROTTLE BOPY
(a) Install the two water by-pass hoses.
(b) Install a new gasket and throttle body with the four
bolts.
(c) Connect the two water by-pass hoses to the ISC
valve and water pipe.

EFI SYSTEM - Air Induction System
FI-107
. .
2. CONNECT THROTTLE POSITION SENSOR
CONNiXTOR .-
3. CONNECT VACUUM HOSES
4. INSTALL AiR INTAKE CONNECTOR
:
(See steps 13 to 15 on page EM-141
5. INSTALL ACCELERATOR CONNECTING ROD
6. REFILL WITH COOLANT

FL1 16 EFI SYSTEM - Electronic Con’trol System
Water Temperature Sensor
._
WATER TEMP. SENSOR
I Thermistor
, I I I I
I -20 0 20 40 60 80 100 120
(-4) (32) (68)(104)(140)1176)(212) (248)
TEMPERATURE “C IoF)
Fl0516FiO7C
INSPECTION OF WATER TEMPERATURE
SENSOR
INSPECT RESISTANCE OF WATER TEMPERATURE
SENSOR
Using an ohmmeter, measure the resistance between both
terminals.
Resistance: Refer to chart.
If the.resistance is not as specified, replace the water tem-
perature sensor.

EFI SYSTEM - Electronic Control System
Fi-119
-.
High Temperature Line .Pressure Up System
To Circuit Opening Relay
4-r STA I
Air Temp. Sensor (Air Flow Meter)
VSVP
-f-HA
E2
THW
Water Temp. Sensor
Ohmmeter INSPECTION OF HIGH TEMPERATURE LINE
PRESSURE UP SYSTEM
I Fl1917
INSPECT VSV
A. Inspect VSV for Open Circuit
Using an ohmmeter, check that there is continuity be-
tween terminals.
Resistance: 30 - 60 n
If there is no continuity, replace the VSV.
1 B. Inspect VSV for Short Circuit
Using an ohmmeter, check that there is no continuity be-
tween each terminal and the body.
If there is continuity, replace the VSV.
-
I J FllSll
C. Inspect VSV Operation
(a) Apply battery voltage across the terminals.
(b) Check that air flows from pipe E to air filter.

EFI SYSTEM - Electronic Control System
FI-121
High Altitude Compensation (HAC)
System (7M.mGTE)
HAC Sensor ECU
Air Flow Meter 7
ov
I -._.. ,,nsor
From Throttle o HAC
on Sensor
t
Ai+ I o E2
) El
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al
mnn I
T J.o -- ---- --_
Y r If
I /, / 1 INSPECTION OF HAC SENSOR
P
n199 zl
INSPECT RESISTANCE OF HAC SENSOR
(a) Remove the glove box.
(b) Using an ohmmeter, measure the resistance between
each terminal.
Terminals
vc - P
VC - E2
P - E2 Resistance
700 - 860 42
2.2 - 3.3 n
2.9 - 4.2 Q
, I
1
If the resistance is not as specified, replace the HAC sen-
sor.

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-124 EFI SYSTEM - Electronic Control System
-.
Ohmmeter 3. (‘IM-GTE)
INSPECT HEATERAESISiANCE OF OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between the
terminals 2 and 3.
R8SiStaflC8:, 3.0 - 3.6 n
If the resistance is not as specified, replace the sensor.

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