TOYOTA CAMRY 1999 Service Repair Manual

F00073
ECU±IGECU±IG
Instrument
Panel J/BECU±IG
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±599
834 Author: Date:
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 in all the harness and compo-
nents connected to ECU±IG fuse (See attached
wiring diagram).
OK
2 Check battery positive voltage.
OK:
Voltage: 10 ± 14 V
NG Check and repair the charging system
5S±FE engine: (See page CH±1)
1MZ±FE engine: (See page CH±1).
OK

F00058
IG1
GND ON
(+)
(±)IG1
GND ON
(+)
(±)IG1
GND ON
(+)
(±)IG1
GND ON
(+)
(±)
F07003
(+)(±) LOCK
GND
DI±600
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
835 Author: Date:
3 Check voltage between terminals IG1 and GND of ABS & TRAC ECU connector.
PREPARATION:
Remove ABS & TRAC ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG1 and GND of ABS
& TRAC ECU connector.
OK:
Voltage: 10 ± 14 V
OK Check and replace ABS & TRAC ECU.
NG
4 Check continuity between terminals GND of ABS & TRAC ECU connector and
body ground.
PREPARATION:
Disconnect the connector from the ABS & TRAC ECU.
CHECK:
Measure resistance between terminal GND of ABS & TRAC
ECU connector 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 & TRAC ECU and battery
(See page IN±31).

± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±601
836 Author: Date:
DTC 43 ABS Control System Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
43
Detection of any conditions from 1. through 8.:
1. During TRAC is in non±operation and DTC of ABS is
output, but TRAC is not during initial lamp checking,
terminal WA of ECU is ON and engine speed is 500 rpm
or more , which continues for 1 sec. or more.
2. Solenoid relay circuit is open or short.
3. Motor relay circuit is open or short.
4. ABS solenoid circuit is open or short.
5. TRAC solenoid circuit is open or short.
6. Speed sensor is under malfunction condition.
7. IG power source is down or raised.
8. Pump motor is locked.

ABS control system
INSPECTION PROCEDURE
1 Check the DTC for the ABS (See page DI±574).
*1 Repair ABS control system according to the
code output.
*2
Check for ECU connected to malfunction indicator lamp.
*1: Output NG code
*2: Malfunction indicator lamp remains ON.
DI04O±04

F00062
ECMABS & TRAC ECU
NEONEO
E8
A16BR±W15 ECMABS & TRAC ECU
NEONEOA16BR±W15 ECMABS & TRAC ECU
NEONEOA16BR±W15 ECMABS & TRAC ECU
NEONEOA16BR±W15
ECMABS & TRAC ECU
NEONEO
A16BR±W15
16
DI±602
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
837 Author: Date:
DTC 44 NE Signal Circuit
CIRCUIT DESCRIPTION
The ABS & TRAC ECU receives engine speed signals (NE signals) from the ECM.
DTC No.DTC Detecting ConditionTrouble Area
44
Condition 1. or 2. is detected:
1. TRAC is in operation and engine speed is 0 rpm contin-
ues for 2.4 sec. or more.
2. TRAC is in non±operation, sift lever is not in P or N posi-
tion, both the front right and left wheels' speed is 30
km/h (19 mph) or more, engine speed is 0 rpm and does
not have communication malfunction, and malfunction
information of engine system is OFF.

NEO circuit

ECM

ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check for open and short circuit in harness and connector between terminal
NEO of ABS & TRAC ECU and terminal NEO of ECM (See page IN±31).
NG Repair or replace harness or connector.
OK
DI04P±04

F00061
NEO (+) (±) ON
F00011
(Reference)
3 ± 6 V
Below 1 V
3 ms. 3 ms. (Reference)
3 ± 6 V
Below 1 V
3 ms. 3 ms.(Reference)
3 ± 6 V
Below 1 V
3 ms. 3 ms.
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±603
838 Author: Date:
2 Check voltage between terminal NEO of ABS & TRAC ECU and body ground.
PREPARATION:
(a) Remove ABS & TRAC ECU with connectors still con-
nected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal NEO of ABS & TRAC ECU
and body ground for the engine conditions below.
OK:
Engine conditionVoltage
OFF (IG ON)3 ± 6 V or below 1 V
ON (Idling)2 ± 3 V (Pulse)
NG Check and replace ABS & TRAC ECU or ECM.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.

F00124
STOP 7
1C4 W
1R Stop
Light
SwitchJ28
5
2ABS & TRAC ECU
A16
Instrument Panel J/B
F91B
1G±WJ27
1SSTP
F4
ALTB±RJ/C
C
A16
R117
5
BP
R9 W±B
Battery MAIN FL Block
BL
B±G1 11R
42 Instrument
Panel J/BG±W
G±W
G±W
Light
Failure
Sensor
Right
Stop
Light High
Mounted
Stop
Light
J40Left
Stop
Light R
H102 1
H10R11R9
1 22
2
5 W±BW±B
W±B
W±B W±B W±B
W±B J/CA
A DI±604
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
839 Author: Date:
DTC 49 Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
49
Battery voltage has never exceeded more than 17.0 V and
become less than 9.5 V within 2.16 sec. and the STP
terminal voltage of ECU is under open circuit detecting
limits continues for 3 sec. or more.
Stop light switch

Stop light switch circuit

ECU
WIRING DIAGRAM
DI04Q±04

F00060
STP (+) (±)
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±605
840 Author: Date:
INSPECTION PROCEDURE
1 Check voltage between terminal STP of ABS & TRAC ECU and body ground.
PREPARATION:
Remove ABS & TRAC ECU with connectors still connected.
CHECK:
Measure voltage between terminal STP of ABS & TRAC ECU
and body ground when brake pedal is depressed.
OK:
Voltage: 8 ± 14 V
OK Check and replace ABS & TRAC ECU.
NG
2 Check for open circuit in harness and connector between ABS & TRAC ECU and
stop light switch (See page IN±31).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI±583).

F03413
ALTEngine Room R/B No. 3
2ABS & TRAC
Motor Relay
A8ABS & TRAC ActuatorABS
4
W±R
MTR+ GR±L
14 24
MR A15
13
F5
F4
B±GFL
Block
MAIN
Battery
EA 1 B±G
333
1
2
3
A8A8
1 23
W±BA15
A15 GR±R
R±W 1ABS & TRAC ECU
1 DI±606
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
841 Author: Date:
DTC 51 ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
51
In the midst of initial check, after the current flows to the
motor for 3 sec. and motor relay is turned OFF , then
within 0.66 sec., the condition that the motor relay
monitor is OFF continues for 0.24 sec. or more.

ABS pump motor
Fail safe function:
If any trouble occurs in the ABS & TRAC pump motor, the ECU cuts off current to the ABS & TRAC solenoid
relay and prohibits ABS control and TRAC control.
WIRING DIAGRAM
DI4KX±01

F03291
(±)
(+)12A8
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±607
842 Author: Date:
INSPECTION PROCEDURE
1 Check operation of ABS & TRAC pump motor.
PREPARATION:
Disconnect the ABS & TRAC actuator connector.
CHECK:
Connect positive
lead to terminal A8 ± 2 and negative  lead
to terminal A8 ± 1 of the ABS & TRAC actuator connector, check
that the pump motor is operates.
OK Check for open circuit in harness and connec-
tor between ABS & TRAC motor relay, ABS &
TRAC actuator and ECU (See page IN±31).
NG
Replace ABS & TRAC actuator.

F00063
ECMABS & TRAC ECU
EFI+
EFI±
TRC+
TRC±EFI+
EFI±
TRC+
TRC±
E7
E7
E7
E7A16
A16
A16
A1614 6
14
13
5W
B
L ECMABS & TRAC ECU
EFI+
EFI±
TRC+
TRC±EFI+
EFI±
TRC+
TRC±E7
E7
E7
E7A16
A16
A16
A16
21
206
14
13
5
W
B
L ECMABS & TRAC ECU
EFI+
EFI±
TRC+
TRC±EFI+
EFI±
TRC+
TRC±E7
E7
E7
E7A16
A16
A16
A166
14
13
5W
B
L
ECMABS & TRAC ECU
EFI+
EFI±
TRC+
TRC±EFI+
EFI±
TRC+
TRC±
E7
E7
E7
E7A16
A16
A16
A166
14
13
5W
B
LG
L
13
DI±608
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
843 Author: Date:
DTC 53 ECM Communication Circuit Malfunction
CIRCUIT DESCRIPTION
This circuit is used to send TRAC control information from the ABS & TRAC ECU to the ECM (TRC+, TRC±),
and engine control information from the ECM to the ABS & TRAC ECU (EFI+, EFI±).
DTC No.DTC Detecting ConditionTrouble Area
53ECM communication data malfunction is detected.

TRC+ or TRC± circuit

EFI+ or EFI± circuit

ECM

ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check for open and short circuit in harness and connector between terminals
EFI+, EFI±, TRC+, TRC± of ABS & TRAC ECU and ECM (See page IN±31).
NG Repair or replace harness or connector.
OK
Check and replace ECM or ABS & TRAC ECU.
DI04S±04