Block TOYOTA TERCEL 1996 Service Owner's Guide

N20819
Theft Deterrent ECU
SH T411
V-W IC2
4
V-W
1
2
W
Engine Room
Relay Block
MAIN FL
Battery 2
1
EA2BB
Theft Deterrent Horn
HAZ-HORN
W
T1 DI-228
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
Theft Deterrent Horn Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact (a) and contact (b) in the ECU close alternately in cycles
of approximately 0.2 sec., causing the theft deterrent horn to blow (See the wiring diagram below).
In this condition, if any of the following operations is done, the contact (a) in the ECU opens, thus stopping
the theft deterrent horn from blowing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI4N6-02

N20820
BatteryMAIN FL
B1
EA2 HAZ-HORN
2 W2Engine Room Relay Block
Horn Relay
11
2
2IC1G-Y24
T4
G-R
1
HORNTheft Deterrent ECU
HORN
H4 G-Y
B
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-231
1996 TERCEL (RM440U)
Horn Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off in approximately
0.4 sec. cycles. This switches the horn relay on and off, thus the horns blow (See the wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the horn relay
switches off, thus stopping the horns from blowing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI4N7-01

N20821
BatteryHeadlight
LHHeadlight
RH MAIN FL B 1
EA2
R
R-L2
2HEAD LH
HEAD RH2 B-R Engine Room Relay Block
Headlight Control Relay
2
2R-L
IC1
16
Light Control
Switch
(Combination
Switch)
13R-L R-L10
T4 Theft Deterrent ECU
HEAD
C12
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-233
1996 TERCEL (RM440U)
Headlight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU for switch on and off at approximate-
ly 0.4 sec. cycles. This switches the headlight control relay on and off, thus flashing the headlights (See the
wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the headlight control
relay switches off, thus stopping the headlights flashing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI4N8-02

N20822
Battery MAIN FL 1
F6 F7ALT B-R
Taillight
LH Taillight
RH 2
EA2B-R
G 1J1Instrument Panel Junction Block
Taillight Control Relay
TAIL4
1E
8
1L
G G LGTheft Deterrent ECU
23
T4 TAIL
1
B
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-235
1996 TERCEL (RM440U)
Taillight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off at approximately
0.4 sec. intervals. This switches the taillight control relay on and off, thus flashing the taillights (See the wiring
diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the taillight control
relay switches off, thus stopping the taillights flashing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI4N9-01

N20823
BatteryMAIN FL2
F61
F7B-R B
Fusible Link
Block2
EA2B-R 2 2AM1
W-G 2 1
1B
1J W-G2Ignition Switch
3
B-Y4
1BCIG & RAD1
1DGRTheft Deterrent ECU
8
T3
ACC
I10Instrument Panel
Junction Block
Instrument Panel
Junction BlockACC
AM1
ALT
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-237
1996 TERCEL (RM440U)
Ignition Switch Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU. Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to the
terminals ACC and IG of the ECU. When the battery positive voltage is applied to the terminal ACC of the
ECU while the theft deterrent system is activated, the warning stops. Furthermore, power supplied from the
terminals ACC and IG of the ECU is used as power for the door courtesy switch, and position switch, etc.
WIRING DIAGRAM
DI4NA-02

N12877N14677I09780
Instrument Panel Junction Block
CIG & RAD
BE4061I05896I09781
ON
IG
(+) (-)
Disconnect
DI-238
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check CIG / RAD fuses.
PREPARATION:
(a) Remove the fuse box cover.
(b) Remove CIG & RAD fuse from instrument panel junction
block.
CHECK:
Check continuity of CIG & RAD fuses.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the CIG & RAD fuse (See at-
tached wiring diagram).
OK
2 Check voltage between terminals ACC of theft deterrent ECU and body ground.
PREPARATION:
(a) Disconnect the theft deterrent ECU connectors.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals ACC of theft deterrent
ECU connector and body ground.
OK:
Voltage: 10 - 14 V
OK Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between theft deterrent ECU and battery
(See page IN-26).

N12896
Rear LeftR-W R-W
Rear Right R-W 2
1 Security Diode1
R-W
Instrument Panel
Junction Block11
1L6
1CR-W3
T4 CTY Front Right1
(2Dr) R
(4Dr) R-G8
IE2R-G19
T4 DSWP Door Courtesy Switch
Front Leftto Door Light
11
IE2R7
T4DSWD Theft Deterrent ECU
F8
F9
11
R11R12 R DI-244
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
Door Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The door courtesy switch goes on when the door is opened and goes off when the door is closed.
WIRING DIAGRAM
DI4ND-01

N12897
EB W-BEngine Room
Relay Block
(JUNCTION CONNECTOR)A
A
2 2Engine Hood
Courtesy Switch
12
LG-B12
IC2
LG-B14
T4 Theft Deterrent ECU
DSWH
E5
W-B DI-246
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
Engine Hood Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The engine hood courtesy switch is built into the engine hood lock assembly and goes on when the engine
hood is opened and goes off when the engine hood is closed.
WIRING DIAGRAM
DI4NE-02

Z14274
(g)(c)
(e)(d)
P20420
Bi-Hexagon Wrench
12
3
4 56 7
8 9
10
P20405
- ENGINE MECHANICALCYLINDER HEAD
EM-29
1996 TERCEL (RM440U)
(c) Using snap ring pliers, remove the snap ring.
(d) Remove the wave washer.
(e) Remove the camshaft sub-gear.
(f) Remove the camshaft gear spring.
31. REMOVE CYLINDER HEAD
(a) Using a bi-hexagon wrench 8 mm, uniformly loosen and
remove the 10 cylinder head bolts, in several passes, in
the sequence shown.
NOTICE:
Cylinder head warpage or cracking could result from re-
moving bolts in incorrect order.
(b) Lift the cylinder head from the dowels on the cylinder
block and place the head on wooden blocks on a bench.
HINT:
If the cylinder head is difficult to lift off, pry with a screwdriver be-
tween the cylinder head and block saliences.
NOTICE:
Be careful not to damage the contact surfaces of the cylin-
der head and cylinder block.

EM0K0-05
P20381
P20380
P20350
P20353
EG0031
- ENGINE MECHANICALCYLINDER HEAD
EM-31
1996 TERCEL (RM440U)
INSPECTION
1. CLEAN TOP SURFACES OF PISTONS AND CYL-
INDER BLOCK
(a) Turn the crankshaft, and bring each piston to top dead
center (TDC). Using a gasket scraper, remove all the car-
bon from the piston top surface.
(b) Using a gasket scraper, remove all the gasket material
from the cylinder block surface.
(c) Using compressed air, blow carbon and oil from the bolt
holes.
CAUTION:
Protect your eyes when using high-pressure compressed
air.
2. CLEAN CYLINDER HEAD
(a) Remove the gasket material.
(b) Using a gasket scraper, remove all the gasket material
from the cylinder block contact surface.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
face.
(c) Clean the combustion chambers.
(d) Using a wire brush, remove all the carbon from the com-
bustion chambers.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
face.
(e) Clean the valve guide bushings.
(f) Using a valve guide bushing brush and solvent, clean all
the guide bushings.