1996 TOYOTA TERCEL Service Repair Manual

W00704
ABS
EA2 2
DLC1 F71
F63
5
MAIN FL
BatteryEngine Room R/B
L
4
12
21L
A6
A71
2
A7A6
A6
A7 6
2
A6
A71Motor Relay
EB
7
ABS ECU
G-R
L-B
G-B
W-B
W-B
EA
A5
A5A5
A5
A5 12
4
3
5LG
LG-B ABS ECU L-WR+MR
A12
A12
A12
A12SR
AST
MT 4
20
8
26
ABS
EA2 2
F71
ALT
F63
5
MAIN FL
BatteryEngine Room R/B
4
1 B-Y
B2
LA6
A71
2
A7A6
A6
A7 6
A6
A7Solenoid
RelayMotor Relay ABS Control Relay
7
G-R
L-B
G-B W-B
W-B
W-B
W-B W-B
A5
A5A5
A5
A5 12
4
LG
LG-B
ABS ActuatorR+MR
SR
AST
MT 4
20
26 Fuse
BlockA12
B-Y2 DI-122
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
DTC 13, 14 ABS Control (Motor) Relay Circuit
CIRCUIT DESCRIPTION
The ABS control (motor) relay supplies power to the ABS pump motor. While the ABS is activated, the ECU
switches the ABS control (motor) relay on and operates the ABS pump motor.
DTC No.DTC Detecting ConditionTrouble Area
13
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (motor) relay terminal (MR) voltage:
Battery positive voltage
2. ABS control (motor) relay monitor terminal (MT) voltage:
0 V

ABS control (motor) relay

Open or short in ABS control (motor) relay circuit

ECU
14
Conditions 1 and 2 continued for 4 sec. or more:
1. ABS control (motor) relay terminal (MR) voltage: 0 V
2. ABS control (motor) relay monitor terminal (MT) voltage:
Battery positive voltage
ABS control (motor) relay

B+ short in ABS control (motor) relay circuit

ECU
Fail safe function:
If trouble occurs in the ABS control (motor) relay circuit, the ECU cuts off the current to the ABS control (sole-
noid) relay and prohibits ABS control.
WIRING DIAGRAM
DI4LV-03

F00389
A6
(-)
(+)
1A6
(-)
(+)
1A6
(-)
(+)
1
LOCK
A6
(-)
(+)
1
R04371
A6
A5
A12 ABS Control
ABS
ECUA5
A5A5
Actuator Relay
2
2
5
26
A6
A5
A12 ABS Control
ABS
ECUA5
A5A5
Actuator Relay
2
2
5
26
A6
A5
A12 ABS Control
ABS
ECUA5
A5A5
Actuator Relay
2
2
5
26
A6
A5
A12 ABS Control
ABS
ECUA5
A5A5
Actuator Relay
2
2
5
26
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-123
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check voltage between terminals A6-1 of ABS control relay and body ground
PREPARATION:
Disconnect the ABS control relay connector.
CHECK:
Measure the voltage between terminals A6-1 of the ABS con-
trol relay harness side connector and body ground.
OK:
Voltage: 10 - 14 V
NG Check and repair harness or connector.
OK
2 Check continuity between terminals A6-2 and A5-2, A5-2 and A5-5, and A5-5
and A12-26.
PREPARATION:
Disconnect the connector from the ABS actuator.
CHECK:
Check the continuity between terminals A6-2 and A5-2, A5-2
and A5-5, and A5-5 and A12-26.
OK:
Continuity
HINT:
There is a resistance of 32 - 34 W between terminals A5-2 and
A5-5.
NG Repair or replace harness or ABS actuator.
OK

F00411
Open
ContinuityA6
1(+) (-)
A7
Continuity
A6
A7
2
3
4
5 6 2
1
2 3
4 3
42
1
DI-124
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
3 Check ABS control relay.
CHECK:
Check the continuity between each terminal of the ABS control
relay.
OK:
Terminals A6-3 and A6-4Continuity
(Reference value 62 W)
Terminals A6-1 and A6-2Open
CHECK:
(a) Apply battery voltage between terminals A6-3 and A6-4.
(b) Check the continuity between terminals of the ABS con-
trol relay.
OK:
Terminals A6-1 and A6-2Continuity
NG Replace ABS control relay.
OK
4 Check for open and short in harness and connector between ABS control relay
and ABS ECU (See page IN-26).
NG Repair or replace harness or connector.
OK
If same code is still output after DTC is deleted, check contact condition of each connection. If
connections are normal, ECU may be defective.

- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-125
1996 TERCEL (RM440U)
DTC 21, 22, 23, 24 ABS Actuator Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the brake
cylinders, thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
21
Conditions 1 through 3 continue for 0.05 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage or ABS ECU terminal AST:
Battery positive voltage
3. When power transistor of ECU is ON, voltage of terminal
SFR is 0 V or battery positive voltage

ABS actuator

Open or short in SFR circuit

ECU
22
Conditions 1 through 3 continue for 0.05 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage or ABS ECU terminal AST:
Battery positive voltage
3. When power transistor of ECU is ON, voltage of terminal
SFL is 0 V or battery positive voltage

ABS actuator

Open or short in SFL circuit

ECU
23
Conditions 1 through 3 continue for 0.05 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage or ABS ECU terminal AST:
Battery positive voltage
3. When power transistor of ECU is ON, voltage of terminal
SRR is 0 V or battery positive voltage

ABS actuator

Open or short in SRR circuit

ECU
24
Conditions 1 through 3 continue for 0.05 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. Voltage or ABS ECU terminal AST:
Battery positive voltage
3. When power transistor of ECU is ON, voltage of terminal
SRL is 0 V or battery positive voltage

ABS actuator

Open or short in SRL circuit

ECU
Fail safe function:
If trouble occurs in the actuator solenoid circuit, the ECU cuts off current to the ABS control (solenoid) relay
and prohibits ABS control.
DI4LW-03

W00705F15132
22
1 2ABS
Battery
B-Y
B
Fuse
Block
W-B
EA
EB
1
W-B
11
W-B
2
2 5
4 L
66
14
DLC1
ABS Control
Relay
Solenoid
Relay
P
R-B
R-W
L-W
G-Y
ABS ECUABS ECU
7 3
8 4
5 1
121 2
SFLR
SFLH
SFRR
SFRH
SRRR
SRRH A6
A5A13
A7 A7
A7
A6A13
A12
A12
A12
A12
Y-R
F7Y
F6Engine Room R/B
L
W-B
W-B
SRLR SRLH A13
A13
B-R
1ABS ECU
ABS ECU
ABS ECU
A4
A4
A4
A4
A4
A4
A4
A4
A5
A56Y
Y
Y-R
Y-R
Y-B Y-B
5
2
15
11
MAIN
FL
ALT
EA2
IC2IE1
IE1 IC2
IC2IE1
IE1 IC2
6
1
14
2
5
43
13 2
ABS Actuator LMotor
Relay
2
G-Y
Y-B
G-Y
Monitor
L-WL-R
R14675
4321
5 6 7 8
4
A5 A4
4321
5 6 7 8
4
A5 A4
4321
5 6 7 8
4
A5 A4
4321
5 6 7 8
4
A5 A4
4321
5 6 7 8
4
A5 A44321
5 6 7 8
4
A5 A4
DI-126
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check ABS actuator solenoid.
PREPARATION:
Disconnect the 2 connectors from the ABS actuator.
CHECK:
Check the continuity between terminals A5-4 and A4-1, 2, 3,
4, 5, 6, 7, 8 of the ABS actuator connector.
OK:
Continuity
HINT:

Resistance of each of the solenoids SFRH, SFLH, SRRH
and SRLH is 5.0 W.

Resistance of each of the solenoids SFRR, SFLR, SRRR
and SRLR is 2.2 W.
NG Replace ABS actuator.
OK

- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-127
1996 TERCEL (RM440U)
2 Check for open and short in harness and connector between ABS ECU and ac-
tuator (See page IN-26).
NG Repair or replace harness or connector.
OK
If same code is still output after DTC is deleted, check contact condition of each connection. If
connections are normal, ECU may be defective.

BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
-VHigh Speed
Low Speed
CoilNS
0 DI-128
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
DTC 31, 32, 33, 34 Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS system. The front and rear rotors each have 48 serra-
tions.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotors, the frequency is used by the ECU
to detect the speed of each wheel.

DTC No.DTC Detecting ConditionTrouble Area
31, 32, 33, 34
Detection of any of conditions 1 through 3:
1. At vehicle speed of 10 km/h (6 mph) or more, pulses are
not input for 5 sec.
2. Momentary interruption of the speed sensor signal oc-
curs at least 7 times in the time between switching the
ignition switch ON and switching it OFF
3. Abnormal fluctuation of speed sensor signals with the
vehicle speed 20 km/h (12 mph) or more

Right front, left front, right rear or left rear speed sensor

Open or short in each speed sensor circuit

ECU
HINT:

DTC 31 is for the right front speed sensor.

DTC 32 is for the left front speed sensor.

DTC 33 is for the right rear speed sensor.

DTC 34 is for the left rear speed sensor.
Fail safe function:
If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
DI983-01

R12890F15193
Right Front Speed Sensor
Left Front Speed Sensor
Right Rear Speed Sensor
Left Rear Speed Sensor2
1 2
2 2
1 1 1W B
R
G
9 10
A12FR+
FR-
FL+
FL-
RR+
RR-
RL+
RL- FSS
3 229
8 BRA12
A12
A12
A12
A13
A13
A13
A13
2 21
23ABS ECU
5 V
LG L
V
P
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-129
1996 TERCEL (RM440U)
WIRING DIAGRAM