TOYOTA CAMRY 1999 Service Repair Manual

F00116
Right Front
Speed Sensor
Left Front
Speed Sensor
Right Rear
Speed Sensor
Left Rear
Speed Sensor2
1
12
1
2
2 1ABS ECU
W
B
R
G
B
G RB WG R 1
6
2
1
3
983
FR+
FR±
FL+
FL±
RR+
RR±
RL+
RL±Right Front
Speed Sensor
Left Front
Speed Sensor
Left Rear
Speed Sensor2
1
12
1
2
2 1ABS ECU
W
B
R
G
W
G RB WG R 1
6
2
1
3
99
93
FR+
FR±
FL+
FL±
RR+
RR±
RL+
RL± 2
10
23
R
G22 IJ2A13
A14 IJ2A13
A13
A13
A14
A14
A14 IK1
IK1
IB1
IB1
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±199
WIRING DIAGRAM

F08572
1
2
F08573
1
2
DI±200
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
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±177).
OK

BR3795
OK NG OK NG
OK NGOK NG
W04200
Normal Signal Waveform
1 V / Division2 m/s / DivisionGND
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±201
2 Check for open and short circuit in harness and connector between each speed
sensor and ECU (See page IN±29).
NG Repair or replace harness or connector.
OK
3 Check speed 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±177).
OK
4 Check speed sensor and sensor rotor serrations.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the ABS ECU.
(b) Connect the oscilloscope to the terminals FR+, FL+, RR+
or RL+ and GND of the ABS ECU.
CHECK:
Drive the vehicle with about 30 km/h (19 mph), and check the
signal waveform.
OK Check and replace ABS ECU.
NG

R00948
R00947
DI±202
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
5 Check sensor rotor and sensor tip.
Front:
PREPARATION:
Remove the front drive shaft (See page SA±6).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth or foreign objects.
PREPARATION:
Remove the front speed sensor (See Pub. No. RM654U on
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 Pub. No. RM654U on page SA±52).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth or foreign objects.
PREPARATION:
Remove the rear speed sensor (See Pub. No. RM654U on
page BR±68).
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±177).
OK
Check and replace ABS ECU.

± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±203
DTC 33, 34 Rear Speed Sensor Rotor Faulty
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
33, 34
The condition that the both rear side wheels' speed is
lower than the front wheels' speed at 20 km/h (12 mph) or
more for 20 sec. or more when the IG switch turns ON
and OFF , which is repeated in a sequence more than 8
times.

Rear axle hub

Right rear, left rear speed sensor

Rear speed sensor circuit
INSPECTION PROCEDURE
1 Check rear axle hub (See Pub. No. RM654U on page SA±52).
NG Replace rear axle hub.
OK
2 Check rear speed sensor (See page DI±198).
NG Replace rear speed sensor.
OK
3 Check for open and short circuit in harness and connector between rear speed
sensor and ECU (See page IN±29).
NG Repair or replace harness and connector.
OK
Check and replace ABS ECU.
DI03L±04

F07156
Ignition
Switch
W24
AM1
IG1
B±YInstrument Panel J/B
19
1K
ECU±IG1JB±RJ/C
J12
C
CB±R13
A14ABS ECU
IG1
Instrument Panel J/B
21
1K
1B
AM1
B±R
FL Block
1
1
F9 F14
ALT
B±G
FL MAIN
Battery
IF A
Instrument
Panel Brace LH J9
Junction
ConnectorW±B
W±B12
A14
A1425GND1
GND2 DI±204
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
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
Condition 1. or 2. is detected:
1. Vehicle speed is at 3 km/h (1.9 mph) or more and ECU
terminal IG1 voltage is 9.5 V or less , which continues
for 10 sec. or more.
2. When IG1 terminal voltage is less than 9.5 V, there is
open circuit in the motor relay or in the solenoid relay, or
the solenoid circuit malfunction.

Battery

Charging system

Power source circuit
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS solenoid relay and prohibits
ABS control.
WIRING DIAGRAM
DI03M±04

F00073
ECU±IGECU±IG
Instrument
Panel J/BECU±IG
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±205
INSPECTION PROCEDURE
1 Check ECU±IG fuse.
PREPARATION:
Remove ECU±IG fuse from Instrument Panel J/B.
CHECK:
Check continuity of ECU±IG fuse.
OK:
Continuity
NG Check for short circuit in all the harness and
components connected to ECU±IG fuse (See at-
tached wiring diagram).
OK
2 Check battery positive voltage.
OK:
Voltage: 10 ± 14 V
NG Check and repair the charging system (See Pub.
No. RM654U on page CH±1).
OK

F07151
ON
(+)(±)
IG1GND
GND
F07152F07216
LOCK
(±) GND
GND(+)
DI±206
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
3 Check voltage between terminals IG1 and GND of ABS ECU connector.
PREPARATION:
Remove ABS ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG1 and GND of ABS
ECU connector.
OK:
Voltage: 10 ± 14 V
OK Check and replace ABS ECU.
NG
4 Check continuity between terminals GND of ABS ECU connector and body
ground.
PREPARATION:
Disconnect the connector from the ABS ECU.
CHECK:
Measure resistance between terminal GND of ABS ECU con-
nector and body ground.
OK:
Resistance: 1 W or less
NG Repair or replace harness or connector.
OK
Check for open circuit in harness and connector between ABS ECU and ECU±IG fuse (See page
IN±29).

F00124
Battery MAIN B±GF9 F141
ALT FL Block
B±R STOP Instrument Panel J/B
1C1B4
7Stop Light
Switch
2G±W
1R 1S5J23 J24J/C
Light Failure
Sensor
J/C
J34
BKBM
W±BG±W
A145
STPABS ECU
R
G±R
High
Mounted
Stop
LightRight
Stop
LightLeft
Stop
Light
A 1Instrument
Panel J/B
G±R W
11R
2 4
G±W
G±R
W±B
W±B
W±B AAC
W±B W±BH8 R10
R8
H8R8
R10 2
122
5 5 G±W
1
2 7
Under the
Left Center
PillarBack Panel
Center
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±207
DTC 49 Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
49
ABS ECU terminal IG1 voltage is 9.5 V to 18.5 V and ABS
is in non±operation, the open circuit of the stop light switch
circuit continues for 0.3 sec. or more.
Stop light switch

Stop light switch circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is released.
NG Repair stop light circuit (See Pub. No. RM654U
on page BE±37).
OK
DI03N±04

F07150
(+)(±) STP
DI±208
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
2 Check voltage between terminal STP of ABS ECU and body ground.
PREPARATION:
Remove ABS ECU with connectors still connected.
CHECK:
Measure voltage between terminal STP of ABS ECU and body
ground when brake pedal is depressed.
OK:
Voltage: 8 ± 14 V
OK Check and replace ABS ECU.
NG
3 Check for open circuit in harness and connector between ABS ECU and stop
light switch (See page IN±29).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on problem symptoms table (See page DI±185).