TOYOTA CAMRY 1999 Service Repair Manual

F00042
1 2 3
4 5 6
(+)(±)1 2 3
4 5 6
1 2 3
4 5 6 Open
Continuity
Continuity
Continuity
Open
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±189
3 Check ABS solenoid relay.
CHECK:
Check continuity between each terminal of ABS solenoid relay.
OK:
Terminals 4 and 6Continuity (Reference value 80 W)
Terminals 2 and 3Continuity
Terminals 1 and 3Open
CHECK:
(a) Apply battery positive voltage between terminals 4 and 6.
(b) Check continuity between each terminal of ABS solenoid
relay.
OK:
Terminals 2 and 3Open
Terminals 1 and 3Continuity
NG Replace ABS solenoid relay.
OK

DI±190
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
4 Check for open and short circuit in harness and connector between ABS sole-
noid relay and ABS ECU (See page IN±29).
NG Repair or replace 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.

± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±191
DTC 13, 14 ABS Motor Relay 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
Condition 1. or 2. continues for 0.2 sec. or more:
1. ABS ECU terminal IG1 voltage is 9.5 V to 18.5 V, and
when motor relay is ON in the midst of initial check or in
operation of ABS control.*
1
2. Motor relay is ON driving in the midst of initial check or
in operation of ABS control, ABS ECU terminal IG1 volt-
age becomes 9.5 V or less.*
2

ABS motor relay

ABS motor relay circuit

ECU
14
Condition below continues for 4 sec. or more:
When the motor relay is OFF, there is open circuit in MT
terminal of ABS ECU.
*1
Relay contact OFF condition: MT terminal voltage is below 3.6 V.
*
2
Relay contact ON condition: MT terminal voltage is 3.6 V or above.
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.
DI03I±04

F07146
B±G
Fusible
Link
Block
F10 1
F9
1
FL
Main B±G
Battery3
3ABSABS Motor
Relay
2 13
43
3 Engine Room R/B No.3
GR±R GR±R1
IJ126
A14 R+ABS ECU
GR±L1
A13 MR
W±R2
A4
A41
W±B
EAABS Actuator
3
A4R±W10
A13 MT ALT
1
2 DI±192
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
WIRING DIAGRAM

F00049
1 (+) (±)
Engine Room
R/B No. 3
2
34 1 (+) (±)
Engine Room
R/B No. 32
34 1 (+) (±)
Engine Room
R/B No. 32
34
1 (+) (±)
Engine Room
R/B No. 3
2
34
F07154
3 3
ECU ECU
ECU
ABS
Motor
Relay2
A4
A4
A18
MT
2
2
ECU
ABS
Actuator
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±193
INSPECTION PROCEDURE
1 Check voltage between terminal 1 of Engine Room R/B No. 3 (for ABS motor
relay) and body ground.
PREPARATION:
Remove ABS motor relay from Engine Room R/B No. 3.
CHECK:
Measure voltage between terminal 1 of Engine Room R/B No.
3 (for ABS motor relay) and body ground.
OK:
Voltage: 10 ± 14 V
NG Check and repair harness or connector.
OK
2 Check continuity between terminal 2 of ABS motor relay and terminal MT of ABS
ECU.
CHECK:
Check continuity between terminal 2 of Engine Room R/B No.3
(for ABS motor relay) and terminal MT of ABS ECU.
OK:
Continuity
HINT:
There is a resistance of 4 ± 6 W between terminals A4 ± 2 and
A4 ± 3 of ABS actuator.
NG Repair or replace harness or ABS actuator.
OK

F00044
1 2
3 4
1 2
3 4
1 2
3 4 Open
Continuity
Continuity
(+)(±)
DI±194
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
3 Check ABS motor relay.
CHECK:
Check continuity between each terminal of ABS motor relay.
OK:
Terminals 3 and 4Continuity (Reference value 62 W)
Terminals 1 and 2Open
CHECK:
(a) Apply battery positive voltage between terminals 3 and 4.
(b) Check continuity between terminals of ABS motor relay.
OK:
Terminals 1 and 2Continuity
NG Replace ABS motor relay.
OK
4 Check for open and short circuit in harness and connector between ABS motor
relay and ABS ECU (See page IN±29).
NG Repair or replace 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.

± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±195
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 wheel
cylinders thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
21
Condition 1. or 2. continues for 0.05 sec. or more:
1. IG1 terminal voltage of ABS ECU is 9.5 ± 18.5 V, there
is open or short circuit in actuator solenoid SFRR or
SFRH.
2. IG1 terminal voltage of ABS ECU is 9.5 ± 18.5 V, and
while ABS is control in operation.*
1

ABS actuator

SFRR or SFRH circuit
22
Condition 1. or 2. continues for 0.05 sec. or more:
1. IG1 terminal voltage of ABS ECU is 9.5 ± 18.5 V, there
is open or short circuit in actuator solenoid SFLR or
SFLH.
2. IG1 terminal voltage of ABS ECU is 9.5 ± 18.5 V, and
while ABS is control in operation.*
1

ABS actuator

SFLR or SFLH circuit
23
Condition 1. or 2. continues for 0.05 sec. or more:
1. IG1 terminal voltage of ABS ECU is 9.5 ± 18.5 V, there
is open or short circuit in actuator solenoid SRRR or
SRRH.
2. IG1 terminal voltage of ABS ECU is 9.5 ± 18.5 V, and
while ABS is control in operation.*
1

ABS actuator

SRRR or SRRH circuit
24
Condition 1. or 2. continues for 0.05 sec. or more:
1. IG1 terminal voltage of ABS ECU is 9.5 ± 18.5 V, there
is open or short circuit in actuator solenoid SRLR or
SRLH.
2. IG1 terminal voltage of ABS ECU is 9.5 ± 18.5 V, and
while ABS is control in operation.*
1

ABS actuator

SRLR or SRLH circuit
*1
Solenoid relay contact ON condition:
All of solenoid terminal voltage is half of IG1 terminal voltage or less than.
Fail safe function:
If trouble occurs in the actuator solenoid circuit, the ECU cuts off current to the ABS solenoid relay and pro-
hibits ABS control.
DI03J±04

F07147
ABS Solenoid RelayGR±R1
IJ1
GR±RABS ECU
26
A14R+
34
56
33
3
3 1
2 DLC1Engine Room
R/B No.3
GR
7
2ABS
1
3
W±L
B±G
Fusible Link Block
1
F10 F91
B±G
FL Main
Battery ALT
EAW±B4
A4A13 SR
ABS
Actuator
1
A5
A55
A53
7
A5
A5
A5
A5
A54
8
2
6R±B
W±R11
IJ2
IJ212R±B
W±R2
A14
A141
A13
A13
A13
A13
A14
A14 L±B
W±L
W±R
R±G
G±Y
LG±B13
IJ2
IJ255
6
11
12
15
14SFRH
SFRR
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR 3
G±Y
LG±B DI±196
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
WIRING DIAGRAM

W00714
A4
A5
1 2 3
4
5
6
7 8
4
A4
A5
1 2 3
4
5
6
7 8
4
A4
A5
1 2 3
4
5
6
7 8
4
A4
A5
1 2 3
4
5
6
7 8
4
A4
A5
1 2 3
4
5
6
7 8
4
A4
A5
1 2 3
4
5
6
7 8
4
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±197
INSPECTION PROCEDURE
1 Check ABS actuator solenoid.
PREPARATION:
Disconnect the 2 connectors from ABS actuator.
CHECK:
Check continuity between terminals A4 ± 4 and A5 ± 1, 2, 3, 4,
5, 6, 7, 8 of ABS actuator connector.
OK:
Continuity
HINT:
Resistance of each solenoid coil is 1.2 W.
NG Replace ABS actuator.
OK
2 Check for open and short circuit in harness and connector between ABS ECU
and actuator (See page IN±29).
NG Repair or replace 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.

BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
±VHigh Speed
Low Speed
CoilNS
DI±198
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DTC31, 32, 33, 34Speed 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 rotor, 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 from 1. through 4.:
1. Vehicle speed is at 10 km/h (6 mph) or more and the
speed sensor signal circuit is open or short circuit con-
tinues for 15 sec. or more.
2. Momentary interruption of the speed sensor signal oc-
curs 7 times or more.
3. Vehicle speed is at 20 km/h (12mph) or more and inter-
ference on the speed sensor signal continues for 5 sec.
or more.
4. Open circuit condition of the speed sensor signal circuit
continues for 0.5 sec. or more.

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

Each speed sensor circuit

Speed sensor rotor
HINT:

DTC No. 31 is for the right front speed sensor.

DTC No. 32 is for the left front speed sensor.

DTC No. 33 is for the right rear speed sensor.

DTC No. 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 solenoid relay and prohibits
ABS control.
DI1JM±03