1996 TOYOTA TERCEL lock

- 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

R14676
21
R14669
1 2
DI-130
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front:
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 0.6 - 2.5 kW
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector and body ground.
OK:
Resistance: 1 MW or higher
Rear:
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 0.8 - 1.8 kW
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector and body ground.
OK:
Resistance: 1 MW or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-1 11).
OK
2 Check for open and short in harness and connector between each speed sensor
and ECU (See page IN-26).
NG Repair or replace harness or connector.
OK

R00948
BR4248
BR3795
OK NG
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-131
1996 TERCEL (RM440U)
3 Check sensor rotor and sensor installation.
Front:
PREPARATION:
Remove the drive shaft (See page SA-18).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
CHECK:
Check the front speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and steering
knuckle.
Rear:
PREPARATION:
Remove the drum (See page SA-39).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
CHECK:
Check the rear speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and rear axle carri-
er.
NG Replace speed sensor or rotor.
NOTICE:
Check the speed sensor signal last (See page DI-1 11).
OK
Check and replace ABS ECU.

W00706
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B 2 2 1 2
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 B
Junction
Connector
B-Y
W-B W-B
GND A13
A1310 21
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B 2 2 1 2
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 BJunction
Connector
B-Y
W-B W-B
GND A13
A1310 21
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B 2 2 1 2
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 BJunction
Connector
B-Y
W-B W-B
GND A13
A1310 21
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B Fuse
Block
2 1 2
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 BJunction
Connector
B-Y
W-B W-B
GND A13
A1310 21
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B
ALT
B-Y
2 1 2
AM1
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 B
Junction
Connector
B-Y
W-B W-B
GND A13
A1310 21
BH
BG
Engine Room R/BEngine Room R/BABS ECU DI-132
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU and, hence the CPU and the actuators.
DTC No.DTC Detecting ConditionTrouble Area
41
Vehicle speed is 3 km/h (1.9 mph) or more and voltage of
ECU terminal IG1 remains at more than 17 V or below 9.5
V for more than 10 sec.
Battery

IC regulator

Open or short in power source circuit

ECU
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
WIRING DIAGRAM
DI4R7-03