1996 TOYOTA TERCEL Service Repair Manual

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

DI98C-01
R03953
A13
1 2 3 4 5 6
7 8 9 10 11 1213
14 15
16 17 18 19 20 21 22 23 24 25 2612 11 12 3 4 5 6 7 8 9 10
A12
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-1 17
1996 TERCEL (RM440U)
TERMINALS OF ECU
Symbols (Terminal No.)Wiring ColorConditionSTD Voltage (V)
IG1 (A12-5) - GND (A13-7)B-Y - W-BIG switch ON10 - 14
SR (A12-20) - R+ (A12-4)G-B - L-BIG switch ON9 - 14
MR (A12-7) - R+ (A12-4)G-R - L-BIG switch ONBelow 1.0
SFRR (A13-5) - GND (A13-7)Y-R - W-BIG switch ON ABS warning light OFF10 - 14
SFRH (A13-6) - GND (A13-7)Y - W-BIG switch ON ABS warning light OFF10 - 14
SFLR (A12-2) - GND (A13-7)R-B - W-BIG switch ON ABS warning light OFF10 - 14
SFLH (A12-1) - GND (A13-7)P - W-BIG switch ON ABS warning light OFF10 - 14
SRRR (A12-15) -
GND (A13-7)L-W - W-BIG switch ON ABS warning light OFF10 - 14
SRRH (A12-14) -
GND (A13-7)R-W - W-BIG switch ON ABS warning light OFF10 - 14
SRLR (A13-11) - GND (A13-7)G-Y - W-BIG switch ON ABS warning light OFF10 - 14
SRLH (A13-12) -
GND (A13-7)Y-B - W-BIG switch ON ABS warning light OFF10 - 14
AST (A12-8) - GND (A13-7)LG - W-BIG switch ON ABS warning light OFF10 - 14
MT (A12-26) - GND (A13-7)LG-B e W-BIG switch ONBelow 1.5
WA (A12 18) GND (A13 7)RL WBIG switch ON ABS warning light ONBelow 2.0WA (A12-18) - GND (A13-7)R-L - W-BIG switch ON ABS warning light OFF10 - 14
STP (A12 12) GND (A13 7)GW WBStop light switch OFFBelow 1.5STP (A12-12) - GND (A13-7)G-W - W-BStop light switch ON8 - 14
Tc (A12-25) - GND (A13-7)P-B - W-BIG switch ON10 - 14
Ts (A12-24) - GND (A13-7)L - W-BIG switch ON10 - 14
FR+ (A12-10) - FR- (A12-9)B - WIG switch ON Slowly turn right front wheelAC generation
FL+ (A12-22) - FL- (A12-23)R - GIG switch ON Slowly turn left front wheelAC generation
RR+ (A13-8) - RR- (A13-9)L - LGIG switch ON Slowly turn right rear wheelAC generation
RL+ (A13-3) - RL- (A13-2)V - PIG switch ON Slowly turn left rear wheelAC generation

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
-

DI4LU-03
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
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-1 19
1996 TERCEL (RM440U)
CIRCUIT INSPECTION
DTC 11, 12 ABS Control (Solenoid) Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
11
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. ABS control (solenoid) relay monitor terminal (AST) volt-
age: 0 V

ABS control (solenoid) relay

Open or short in ABS control (solenoid) relay circuit

ECU
12
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage: 0 V
2. ABS control (solenoid) relay monitor terminal (AST) volt-
age: Battery positive voltage
ABS control (solenoid) relay

B+ short in ABS control (solenoid) relay circuit

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

F00387
LOCK
A7
R04370
ECUECU ECUECUA12 A5A5 A5A5 A7
5
4
38 ABS
Actuator ABS Control
Relay
DI-120
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check voltage between terminals A7-2 and A7-6 of ABS control relay connector.
PREPARATION:
Disconnect the ABS control relay connector.
CHECK:
Measure the voltage between terminals A7-2 and A7-6 of the
ABS control relay harness side connector.
OK:
Voltage: 10 - 14 V
NG Check and repair harness or connector.
OK
2 Check continuity between terminal A7-5 and A5-4, A5-4 and A5-3, and A5-3
and A12-8.
PREPARATION:
Disconnect the connector from the ABS actuator.
CHECK:
Check the continuity between terminals A7-5 and A5-4, A5-4
and A5-3, and A5-3 and A12-8.
OK:
Continuity
HINT:
There is a resistance of 32 - 34 W between terminals A5-4 and
A5-3.
NG Repair or replace harness or ABS actuator.
OK

F00388
Continuity
Open
(-)
(+)A6
Continuity
Open Continuity A7
A6A7
1 2
3
45 6
1 2 3
5
6 1 2
3 4
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-121
1996 TERCEL (RM440U)
3 Check ABS control relay.
CHECK:
Check the continuity between each terminal of the ABS control
(solenoid) relay.
OK:
Terminals A7-1 and A6 -3Continuity
(Reference value 80 W)
Terminals A7-5 and A7 -6Continuity
Terminals A7-2 and A7-5Open
CHECK:
(a) Apply battery voltage between terminals A7-1 and A6-3.
(b) Check the continuity between each terminal of the ABS
control relay.
OK:
Terminals A7-5 and A7-6Open
Terminals A7-2 and A7-5Continuity
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.