TOYOTA CAMRY 1999 Service Repair Manual

F00044
1 2
3 4
1 2
3 4
1 2
3 4 ContinuityOpen
Continuity
(+) (±)
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±589
824 Author: Date:
3 Check ABS & TRAC motor relay.
CHECK:
Check continuity between each terminal of ABS & TRAC 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 & TRAC mo-
tor relay.
OK:
Terminals 1 and 2Continuity
NG Replace ABS & TRAC motor relay.
OK
4 Check for open and short circuit in harness and connector between ABS &
TRAC motor relay and ABS & TRAC ECU (See page IN±31).
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.

DI±590
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
825 Author: Date:
DTC 21 to 28 ABS & TRAC 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

ABS actuator

SFRR or SFRH circuit

ECU
22

ABS actuator

SFLR or SFLH circuit

ECU
23Conditions 1. and 2. or 3. continue for 0.48 sec. or more:
1 Recoveryprohibit runpulse is not output solenoid relay

ABS actuator

SRRR or SRRH circuit

ECU
24
1. Recovery prohibit run pulse is not output, solenoid relay
is ON, AST voltage of ECU terminal is 8.0 V or more,
and solenoid output has no change between the last
time and this time.
ABS actuator

SRLR or SRLH circuit

ECU
25
time and this time.
2. Solenoid output is ON, pressure holding solenoid moni-
tor voltage is more than 1.0 V or pressure eduction sole-
noid monitor voltage is more than 1.5 V.

ABS actuator

SMC1 circuit

ECU
26
g
3. Solenoid output is OFF, solenoid monitor voltage is more
than ±1.0 V AST voltage of ECU.
ABS actuator

SMC2 circuit

ECU
27

ABS actuator

SRC1 circuit

ECU
28

ABS actuator

SRC2 circuit

ECU
Fail safe function:
If any trouble occurs in the actuator solenoid circuit, the ECU cuts off current to the ABS & TRAC solenoid
relay and prohibits ABS control and TRAC control.
DI04L±04

F03952
SRLH
10
SR
R+
SFLR
SRRR
SRC2
AST
10
SFLR
SRRR
SRC2
AST Battery
MAIN
B±G1F4
ALT
1 B±G
F5
FL
Block
W±B
EA 3
333 2 ABS
12 Engine Room R/B No. 3
ABS & TRAC
Solenoid
Relay
16 33
3
4
5
W±L DLC1GR
GR±R
4A8ABS & TRAC ECU
ABS & TRAC ActuatorA7
A7
A7
A7
A7
A7
A7
A7
A7
A7
A7
A7
A89
10
12
11
3
4
6
5
7
2
8
1
5R±B
G±Y
L±B
W±R
W±R
LG±B
W±L
R±G
B±R
B±Y
Y±R
Y±B
R11
A15
1A15
13
A15
25
A15
2A17
8A17
26
A15
12
A15
1A17
7A17
5A17
4A17
12
A17
6A17
A15
SFLH
SRRH
SFRR
SRLR
SRC1
SMC1
SMC2 SFRH
F00057
1 2 3
4 5 6
7
8 9 10 11 12
A7
4
1 2 3
4 5 6
7
8 9 10 11 12
A7
4
1 2 3
4 5 6
7
8 9 10 11 12
A7
4
1 2 3
4 5 6
7
8 9 10 11 12
A7
4
1 2 3
4 5 6
7
8 9 10 11 12
A7
41 2 3
4 5 6
7
8 9 10 11 12A8
A74
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±591
826 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check ABS & TRAC actuator solenoid.
PREPARATION:
Disconnect the 2 connectors from ABS & TRAC actuator.
CHECK:
Check continuity between terminals A8 ± 4 and A7 ± 1, 2, 3, 4,
5, 6, 7, 8, 9, 10, 11, 12 of ABS & TRAC actuator connector.
OK:
Continuity
HINT:
Resistance of each solenoid coil is 1.2 W.
NG Replace ABS & TRAC actuator.
OK

DI±592
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
827 Author: Date:
2 Check for open and short circuit in harness and connector between ABS &
TRAC ECU and actuator (See page IN±31).
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
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±593
828 Author: Date:
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 and TRAC system. The front and rear rotors each have
48 serrations.
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 3.:
1. ABS is in non±operation, wheel speed is 10 km/h or
more, one eighth of maximum wheel speed is greater
than the minimum wheel speed, one eighth of maximum
wheel speed is smaller than the rear maximum wheel
speed or momentary interruption of both the rear wheels
are shown in the 15 sec. or more continuously.
2. ABS is in non±operation, momentary interruption of
speed sensor occurs 7 times or more in the mean time
of switching the ignition switch ON and OFF or vehicle
speed is 20 km/h (12 mph) or more and the condition of
noise interference or non±noise interference occurs 75
times or more within 5 sec.
3. Vehicle is at a stop, malfunction signal of vehicle speed
sensor hardware open circuit is ON for 1.02 sec. contin-
uously since starting the checking of a certain vehicle.

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

Each speed sensor circuit

Speed sensor rotor

ECU
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 any trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS & TRAC solenoid relay
and prohibits ABS control and TRAC control.
DI1JP±03

F00116
ABS & TRAC ECU
A15
A16 B
G6W
12
R
IK2
IL1 Left Front
Speed SensorRight Front
Speed Sensor
B
G R
Left Rear
Speed Sensor Right Rear
Speed Sensor2
1
1
2
2
1A15
A15
A15
A16
A16
A16 R
IK21
G
W
IL11 2FR+
FL+
FL±
RR+ 17
RL+
RL± 4 18
5FR±
RR± 10
ID19
ID12
1 93ABS & TRAC ECU
A15
A16 B
G6W
12
R
IK2
IL1 Right Front
Speed Sensor
B
W
*1
G R
Left Rear
Speed Sensor2
1
1
2
2
1A15
A15
A15
A16
A16
A16 R
IK21
G
W
IL11 2FR+
FL+
FL±
RR+ 17
RL+
RL± 4 18
5FR±
RR± 10
ID19
ID12
1 93
Y
*2
G*1
BR*2
B*1
Y*2
W*1
P*2
*1
: TMC Made*2: TMMK Made DI±594
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
829 Author: Date:
WIRING DIAGRAM

R14205
1
2
R14213
12
12
12
12
12
1212
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±595
830 Author: Date:
INSPECTION PROCEDURE
1 Check speed sensor.
Front:
PREPARATION:
(a) Remove the front fender liner.
(b) Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.6 ± 2.5 kW
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 MW or higher
Rear:
PREPARATION:
(a) Remove the seat cushion and side seatback.
(b) Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 1.2 ± 2.3 kW
CHECK:
Measure resistance between terminals 1 and 2 of 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±574).
OK

BR3795
OK NG OK NG
OK NGOK NG
W04200
Normal Signal Waveform
1 V / Division2 m/s / DivisionGND
DI±596
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
831 Author: Date:
2 Check for open and short circuit in harness and connector between each speed
sensor and ECU (See page IN±31).
NG Repair or replace harness or connector.
OK
3 Check sensor installation.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and steering
knuckle or rear axle carrier.
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI±574).
OK
4 Check speed sensor and sensor rotor serrations.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the ABS & TRAC ECU.
(b) Connect the oscilloscope to the terminals FR+, FL+, RR+
or RL+ and GND of the ABS & TRAC ECU.
CHECK:
Drive the vehicle with about 30 km/h (19 mph), and check the
signal waveform.
OK Check and replace ABS & TRAC ECU.
NG

R00948
R00947
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±597
832 Author: Date:
5 Check sensor rotor and sensor tip.
Front:
PREPARATION:
Remove front drive shaft (See page SA±26).
CHECK:
Check sensor rotor serrations.
OK:
No scratches , missing teeth or foreign objects.
PREPARATION:
Remove the front speed sensor (See page BR±68).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
Rear:
PREPARATION:
Remove the axle hub (See page SA±52).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches , missing teeth or foreign objects.
PREPARATION:
Remove the rear speed sensor (See page BR±71).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
NG Replace sensor rotor or speed sensor.
NOTICE:
Check the speed sensor signal last. (See page DI±574).
OK
Check and replace ABS & TRAC ECU.

F00175
Battery MAIN FL Block
B±G 1K2Ignition
Switch
Instrument Panel J/B
1B
F4 F91A16
GND3
B±R
1Instrument Panel J/B
1
A15 B±YJ/C
4B±R
CABS & TRAC ECU
9
A17 1JJ12
IG1
W±B W
GND1
GND2 21K1
CB±R
A17 W±B
W±B
EA8
15
109
W±B
W±B
Battery MAIN FL Block
B±G 1K2Ignition
Switch
Instrument Panel J/B
1B
F4 F91A16
GND3
B±R
1Instrument Panel J/B
1
A15 B±YJ/C
4B±R
CABS & TRAC ECU
9
A17 1JJ12
IG1
W±B W
GND1
GND2 21K1
CB±R
A17 W±B
W±B
EA8
15
109
W±B
W±B
Battery MAIN FL Block
B±G 1K2Ignition
Switch
Instrument Panel J/B
1B
F4 F91A16
GND3
B±R
1Instrument Panel J/B
1
A15 B±YJ/C
4B±R
CABS & TRAC ECU
9
A17 1JJ12
IG1
W±B W
GND1
GND2 21K1
CB±R
A17 W±B
W±B
EA8
15
109
W±B
W±B
Battery MAIN FL Block
B±G 1K2Ignition
Switch
Instrument Panel J/B
1B
F4 F91A16
GND3
B±R
1Instrument Panel J/B
1
A15 B±YJ/C
4B±R
CABS & TRAC ECU
9
A17 1JJ12
IG1
W±B W
GND1
GND2 21K1
CB±R
A17 W±B
W±B
EA8
15
109
W±B
W±BBattery MAIN FL Block
ALT
B±GAM1 1K2Ignition
Switch
Instrument Panel J/B
1B
F4 F91A16
GND3
B±R
1Instrument Panel J/B
1
A15 B±YJ/C
ECU±IG 4B±R
CABS & TRAC ECU
9
A17 1JJ12
IG1
W±B W
GND1
GND2 21K1
CB±R
A17 W±B
W±B
EA8
15
109
W±B
W±B DI±598
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
833 Author: Date:
DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the actuators.
DTC No.DTC Detecting ConditionTrouble Area
41
Detection of any conditions from 1. through 3.:
1. Vehicle speed is 3 km/h (1.9 mph) or more and battery
voltage is less than 9.5 V continues for 10 sec. or more.
2. Battery voltage has never exceeded more than 17.0 V
and has become less than 9.5 V within 2.16 sec., under
malfunction of solenoid relay monitor after the solenoid
relay is ON, at ECU AST terminal voltage of ECU has
become 8.0 V or more or under malfunction of motor
relay monitor and after the motor relay is ON, motor
relay monitor has become ON.
3. Battery voltage is more than 17.0 V , which continues for
1.2 sec. or more or battery voltage has become more
than 17.0 V within 2.16 sec. and solenoid or motor relay
monitor is under malfunction condition.

Battery

Charging system

Power source circuit

ECU
Fail safe function:
If any trouble occurs in the power source circuit, the ECU cuts off current to the ABS & TRAC solenoid relay
and prohibits ABS control and TRAC control.
WIRING DIAGRAM
DI04N±04