Page 2961 of 4770

BR3893
Malfunction Code (Example Code 72, 76)
72 67
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec.
2.5 sec.4 sec.
Repeat
H07517
TOYOTA
Hand±held Tester
DLC2
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (BOSCH Made)
DI±541
776 Author: Date:
HINT:
See the list of DTC shown at the bottom of this page.
If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).
If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed 1st.
(12) After doing the check, disconnect the SST from ter-
minals Tc and E
1 of DLC1, and turn ignition switch
OFF.
SST 09843 ± 18020
(b) Using TOYOTA hand±held tester, check the DTC.
(1) Do step 1. ~ 6. on the previous page.
(2) Hook up the TOYOTA hand±held tester to the
DLC2.
(3) Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the TOYOTA hand±held tester oper-
ator 's manual for further details.
DTC of speed sensor check function:
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensor
Right front speed sensor
Sensor installation
Right front speed sensor rotor
72Low output voltage of left front speed sensor
Left front speed sensor
Sensor installation
Left front speed sensor rotor
73Low output voltage of right rear speed sensor
Right rear speed sensor
Sensor installation
Right rear speed sensor rotor
74Low output voltage of left rear speed sensor
Left rear speed sensor
Sensor installation
Left rear speed sensor rotor
75Abnormal change in output voltage of right front speed
sensorRight front speed sensor rotor
76Abnormal change in output voltage of left front speed
sensorLeft front speed sensor rotor
77Abnormal change in output voltage of right rear speed
sensorRight rear speed sensor rotor
78Abnormal change in output voltage of left rear speed sensorLeft rear speed sensor rotor
Page 2962 of 4770

DI03W±11
DI±542
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (BOSCH Made)
777 Author: Date:
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843 ±18020, connect the terminals Tc and E1.
If a malfunction code is displayed during the DTC check, check the circuit listed for 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±546)ABS solenoid valve relay faulty
ABS solenoid valve relay
Valve supply voltage
ECU
13
(DI±548)ABS pump motor faulty
ABS motor relay
Pump motor voltage
Pump motor lead disconnected
ECU
21
(DI±550)Right front solenoid valves faultyABS actuator (right front inlet or outlet solenoid valve)
22
(DI±550)Left front solenoid valves faultyABS actuator (left front inlet or outlet solenoid valve)
23
(DI±550)Right rear solenoid valves faultyABS actuator (right rear inlet or outlet solenoid valve)
24
(DI±550)Left rear solenoid valves faultyABS actuator (left rear inlet or outlet solenoid valve)
31
(DI±552)Right front wheel speed sensor signal malfunction
32
(DI±552)Left front wheel speed sensor signal malfunctionRight front, left front, right rear and left rear speed sensor
Each speed sensor circuit
33
(DI±552)Right rear wheel speed sensor signal malfunction
Each s eed sensor circuit
Sensor installation
ECU
34
(DI±552)Left rear wheel speed sensor signal malfunction
35
(DI±552)Open circuit in right front wheel speed sensor circuitRight front, left front speed sensor
Eh d i it36
(DI±552)Open circuit in left front wheel speed sensor circuit
Each speed sensor circuit
ECU
37
(DI±557)Speed sensor rotor is wrong number of teeth on one of the 4
wheelsSpeed sensor
Sensor rotor
ECU
38
(DI±552)Open circuit in right rear wheel speed sensor circuitRight rear, left rear speed sensor
Eh d i it39
(DI±552)Open circuit in left rear wheel speed sensor circuit
Each speed sensor circuit
ECU
41
(DI±558)Low battery positive voltage
Battery
Charging system regulator
Power source circuit
ECU
58
(DI±561)Open circuit in stop light switch circuit
Stop light switch
Stop light switch circuit
ECU
62
(DI±563)Malfunction in ECUECU
Page 2963 of 4770
DI03X±05
F01175
ABS Actuator
(w/ ECU, Relay)Front Speed Sensor
DLC1
DLC2Sensor Rotor
Rear Speed Sensor
Stop Light Switch ABS Warning Light
Sensor Rotor
Front Speed Sensor
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (BOSCH Made)
DI±543
778 Author: Date:
PARTS LOCATION
Page 2964 of 4770

DI1JN±03
F00050
A6
12 345678
910 1112 13 14 15
16 17 181920 21 2223 24 2526 DI±544
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (BOSCH Made)
779 Author: Date:
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
+B (A6 ± 17, 18) ± GND (A6 ±
16, 19)L e W±BAlways10 ± 14
IG1 (A6 ± 15) ± GND (A6 ± 16,
19)B±R e W±BIG switch ON10 ± 14
WA (A6 ± 21) ± GND (A6 ± 16,RLWBIG switch ON, ABS warning light ONBelow 2.6WA (A6 21) GND (A6 16,
26)R±L e W±BIG switch ON, ABS warning light OFF10 ± 14
STP (A6 ± 14) ± GND (A6 ± 16,GWWBStop light switch OFFBelow 1.5STP (A6 14) GND (A6 16,
19)G±W e W±BStop light switch ON5 ± 14
Tc (A6 ± 12) ± GND (A6 ± 16,
19)LG±R e W±BIG switch ON5.7 ± 8.1
Ts (A6 ± 11) ± GND (A6 ± 16,
19)R±Y e W±BIG switch ON5.7 ± 8.1
FR+ (A6 ± 5) ± FR± (A6 ± 4)W e BIG switch ON, slowly turn right front wheelAC generation
FL+ (A6 ± 7) ± FL± (A6 ± 6)R e GIG switch ON, slowly turn left front wheelAC generation
RR+ (A6 ± 3) ± RR± (A6 ± 1)P e LIG switch ON, slowly turn right rear wheelAC generation
RL+ (A6 ± 9) RL± (A6 ± 8)Y e BRIG switch ON, slowly turn left rear wheelAC generation
Page 2965 of 4770

DI03Z±10
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (BOSCH Made)
DI±545
780 Author: Date:
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 troubleshooting page.
SymptomSuspect AreaSee page
ABS does not operate
Only when 1. to 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. Power source circuit
3. Speed sensor circuit
4. Check the hydraulic circuit for leakage.
DI±539
DI±558
DI±552
DI±571
ABS does not operate intermittently
Only when 1. to 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 hydraulic circuit for leakage.
DI±539
DI±552
DI±561
DI±571
ABS warning light abnormal1. ABS warning light circuit
2. ABS ECUDI±565
DI±563
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±565
DI±567
Speed sensor signal check cannot be done1. Ts terminal circuit
2. ABS ECUDI±569
DI±563
Page 2966 of 4770

DI040±08
F03949
Actuator Assembly
BatteryActuator Assembly
MAINB±GF4 1 ALT
FL
Block 1F5 B±G3
ABS
12 3
Engine
Room R/B
No.3L
L
18
A6
+B+BA6
Valve Relay
Motor Relay17
A6 16 GND2
W±BEA
W±B
W±B 19
A6GND1 ECU DI±546
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (BOSCH Made)
781 Author: Date:
CIRCUIT INSPECTION
DTC 11 ABS Solenoid Valve 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
Detection of any conditions from 1. through 3.:
1. 3 or more solenoid valves are shown faulty in response
and simultaneously valve supply voltage is detected
faulty.
2. Solenoid valve relay will not be switched OFF.
3. Valve relay is frozen in spite of its high valve relay sup-
ply voltage.
ABS solenoid valve relay
Valve supply voltage
ECU
Fail safe function:
If trouble occurs in the ABS solenoid valve relay circuit, the ECU cuts off current to the ABS solenoid valve
relay and prohibits ABS control.
WIRING DIAGRAM
Page 2967 of 4770
F00064
LOCK
191817
16
(+) (±) LOCK
191817
16
(+) (±)
A6 LOCK
191817
16
(+) (±)
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (BOSCH Made)
DI±547
782 Author: Date:
INSPECTION PROCEDURE
1 Check voltage between terminals A6 ± 17, 18 and A6 ± 16, 19 of ABS actuator
connector.
PREPARATION:
Disconnect the ABS actuator connector.
CHECK:
Measure the voltage between terminals A6 ± 17, 18 and A6 ±
16, 19 of ABS actuator harness side connector.
OK:
Voltage: 10 ± 14 V
NG Check and replace fuses.
Check and repair harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.
Page 2968 of 4770

F03949
Actuator Assembly
BatteryActuator Assembly
MAINB±GF4 1 ALT
FL
Block 1F5 B±G3
ABS
12 3L
L
18
A6
+B+BA6
Valve Relay
Motor Relay17
A6 16 GND2
W±BEA
W±B
W±B 19
A6GND1 ECU Engine
Room R/B
No.3 DI±548
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (BOSCH Made)
783 Author: Date:
DTC 13 Pump Motor Circuit
CIRCUIT DESCRIPTION
The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switches
the ABS motor relay ON and operates the ABS pump motor.
DTC No.DTC Detecting ConditionTrouble Area
13
Detection of any conditions from (1) through (3):
1. After actuation of the motor relay, pump motor voltage
will not be supplied within 0.4 sec.
2. Pump motor voltage is at a high level, motor relay will
not actuate for 2.5 sec. or more.
3. Pump motor voltage keeps low level for longer than 0.4
sec. and the pump repeats activating for 7 sec. 3 times
maximally. since the last activation, the pump motor has
been gone dead because of short circuit.
ABS motor relay
Pump motor voltage
Pump motor lead disconnected
ECU
Fail safe function:
If trouble occurs in the ABS motor relay circuit, the ECU cuts off current to the ABS solenoid relay and prohib-
its ABS control.
WIRING DIAGRAM
DI041±08