1996 TOYOTA TERCEL sensor

DI-1 14
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
(b) Check the DTC of speed sensor function.
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensor
Right front speed sensor

Sensor installation
72Low output voltage of left front speed sensor
Left front speed sensor

Sensor installation
73Low output voltage of right rear speed sensor
Right rear speed sensor

Sensor installation
74Low output voltage of left rear speed sensor
Left rear speed sensor

Sensor installation
75Abnormal change in output voltage of right front speed sen-
sor
Right front speed sensor rotor
76Abnormal change in output voltage of left front speed sen-
sor
Left front speed sensor rotor
77Abnormal change in output voltage of right rear speed sen-
sor
Right rear speed sensor rotor
78Abnormal change in output voltage of left rear speed sensor
Left rear speed sensor rotor

DI4LQ-02
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-1 15
1996 TERCEL (RM440U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843-18020, connect the terminals Tc and E
1, and remove the short pin.
If a malfunction code is displayed during the DTC check, check the circuit listed for that the code. For details
of each code, turn to the page referred to under the ºSee pageº for respective ºDTC No.º in the DTC chart.
DTC No.
(See page)Detection ItemTrouble Area
11
(DI-1 19)Open circuit in ABS control (solenoid) relay circuit

ABS control (solenoid) relay

Open or short in ABS control (solenoid) relay circuit

ECU
12
(DI-1 19)Short circuit in ABS control (solenoid) relay circuit

ABS control (solenoid) relay

B+ short in ABS control (solenoid) relay circuit

ECU
13
(DI-122)Open circuit in ABS control (motor) relay circuit

ABS control (motor) relay

Open or short in ABS control (motor) relay circuit

ECU
14
(DI-122)Short circuit in ABS control (motor) relay circuit

ABS control (motor) relay

B+ short in ABS control (motor) relay circuit

ECU
21
(DI-125)Open or short circuit in solenoid circuit for right front wheel

ABS actuator

Open or short in SFR circuit

ECU
22
(DI-125)Open or short circuit in solenoid circuit for left front wheel

ABS actuator

Open or short in SFL circuit

ECU
23
(DI-125)Open or short circuit in solenoid circuit for right rear wheel

ABS actuator

Open or short in SRR circuit

ECU
24
(DI-125)Open or short circuit in solenoid circuit for left rear wheel

ABS actuator

Open or short in SRL circuit

ECU
31
(DI-128)Right front wheel speed sensor signal malfunction
32
(DI-128)Left front wheel speed sensor signal malfunction
Right front, left front, right rear or left rear speed sensor
O htihd iit33
(DI-128)Right rear wheel speed sensor signal malfunction

Open or short in each speed sensor circuit

ECU
34
(DI-128)Left rear wheel speed sensor signal malfunction
41
(DI-132)Low battery positive voltage or abnormally high battery positive
voltage

Battery

IC regulator

Open or short in power source circuit

ECU
51
(DI-135)Pump motor is locked
Open in pump motor ground
ABS pump motor
Always ONMalfunction in ECU
ECU

DI4LR-01
W00983F15254
ABS ActuatorControl RelaySensor Rotor
Rear Speed Sensor ABS Warning Light
Sensor Rotor Front Speed Sensor
ABS ECU
DLC1
DI-1 16
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
PARTS LOCATION

DI4LT-02
DI-1 18
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant page for troubleshooting.
SymptomsSuspected AreaSee page
ABS does not operate
Only when 1 - 4 are all normal and the problem is still occurring, replace the ABS
ECU
6. Check the DTC, reconfirming that the normal code is output
7. IG power source circuit
8. Speed sensor circuit
9. Check the ABS actuator with a checker
If abnormal, check the hydraulic circuit for leakage (See page DI-145).
DI-1 11
DI-132
DI-128
BR-35
ABS does not operate effi-
ciently
Only when 1 - 4 are all normal and the problem is still occurring, replace the ABS
ECU
1. Check the DTC, reconfirming that the normal code is output
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the ABS actuator with a checker
If abnormal, check the hydraulic circuit for leakage (See page DI-145)
DI-1 11
DI-128
DI-136
BR-35
ABS warning light abnormal1. ABS warning light circuit
2. ABS ECUDI-138
-
DTC check cannot be done
Only when 1 and 2 are all normal and the problem is still occurring, replace the
ABS ECU
1. ABS warning light circuit
2. Tc terminal circuit
DI-138
DI-141
Speed sensor signal check
cannot be done1. Ts terminal circuit
2. ABS ECUDI-143
-

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.