TOYOTA CAMRY 1999 Service Repair Manual

± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±609
844 Author: Date:
DTC 61 Engine Control System Malfunction
CIRCUIT DESCRIPTION
If any trouble occurs in the engine control system, the ECU prohibits TRAC control.
DTC No.DTC Detection ConditionTrouble Area
61
Conditions 1. and 2. are detected:
1. ECM communication is normal, malfunction information
of engine system is ON, and engine speed is 500 rpm or
more , which continues for 0.48 sec. or more, and TRAC
operation start condition is concluded.
2. ECM communication is normal, malfunction information
of engine system is ON, engine speed is 500 rpm and
more which continues for 1 sec. or more, and the engine
system memorizes DTC.

Engine control system
INSPECTION PROCEDURE
1 Check the DTC for the engine (See page DI±197).
*1 Repair engine control system according to the
code output.
*2
Check for ECU connected to malfunction indicator light.
*1: Output NG code
*2: Malfunction indicator light remains ON.
DI04T±04

DI±610
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
845 Author: Date:
DTC Always ON ABS & TRAC ECU Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Always ONABS & TRAC ECU internal malfunction is detected.
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.
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI±574.
YES Repair circuit indicated by the code output.
NO
2 Is normal code displayed?
YES Check solenoid relay. Check for short circuit in
harness and connector between solenoid relay
and DLC1 (See page IN±31).
NO
3 Does ABS warning light go off?
YES Check for open and short circuit in harness and
connector between ECU±IG fuse and ABS &
TRAC ECU (See page IN±31).
NO
DI1JQ±03

± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±611
846 Author: Date:
4 Check battery positive voltage.
CHECK:
Check the battery positive voltage.
OK:
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
5 Check ABS warning light.
PREPARATION:
(a) Disconnect the connector from the ABS & TRAC ECU.
(b) Turn the ignition switch ON.
CHECK:
Check the ABS warning light goes off.
OK Check and replace ABS & TRAC ECU.
NG
Check for short circuit in harness and connector between ABS warning light, DLC1, DLC2, and
ABS & TRAC ECU (See page IN±31)

F00168
BatteryABS & TRAC
Solenoid Relay Engine Room R/B No. 3
3ABS & TRAC
ECU
A8 1
R±L
C 5 4
IG3 IK2 6
J/C C10
EA4ABS Warning Light 8
12 II3
G±B23 2
22 ABS & TRAC
Actuator
DLC1 Short
Pin
WA
J29 33 3 3
3
W±B4
ABS & TRAC
ECUR±L
4
R±L
II3 5
G±B
C C G±B R±LC107
ABS & TRAC ECU R±LR±L
J/C
D 1D
GAUGE Instrument Panel J/B
A16 J4 D
G±B4 W±L
2
DI±612
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
847 Author: Date:
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects a trouble, it lights the ABS warning light while at the same time prohibiting ABS control.
At this time, the ECU records a DTC in memory.
Connect terminals Tc and E
1 of the DLC1 or DLC2 to make the ABS warning light blink and output the DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
Troubleshoot in accordance with the chart below for each trouble symptom.
ABS warning light does not light upGo to step 1
ABS warning light remains onGo to step 3
1 Check ABS warning light.
See combination meter troubleshooting on page BE±2.
NG Repair bulb or combination meter assembly.
OK
DI04V±04

F00043
1 2 3
4 5 6
1 2 3
4 5 6
1 2 3
4 65 Open
Continuity
Continuity
Open Continuity
(+) (±)
(+) (±)1 2 3
4 5 6 Continuity
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±613
848 Author: Date:
2 Check ABS & TRAC solenoid relay.
PREPARATION:
Remove ABS & TRAC solenoid relay from Engine Room R/B
No. 3.
CHECK:
Check continuity between each terminal of ABS & TRAC sole-
noid 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 & TRAC
solenoid relay.
OK:
Terminals 2 and 3Open
Terminals 1 and 3Continuity
CHECK:
Connect the
test lead to terminal 5 and the  lead to terminal
3. Check continuity between the terminals.
OK:
Continuity
If there is no continuity, connect the  test lead to terminal 5
and the
lead to terminal 3. Recheck continuity between ter-
minals.
NG Replace ABS & TRAC solenoid relay.
OK
Check for open circuit in harness and connector between DLC1, ABS & TRAC solenoid relay and
body ground (See page IN±31).

DI±614
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
849 Author: Date:
3 Is DTC output?
Check DTC on page DI±574.
YES Repair circuit indicated by the code output.
NO
4 Does ABS warning light go off?
NO Check for short circuit in harness and connec-
tor between ABS warning light, DLC1 and ABS
& TRAC ECU (See page IN±31).
YES
5 Check ABS & TRAC solenoid relay (See step 2).
NG Replace ABS & TRAC solenoid relay.
OK
Check for short circuit in harness and connector between DLC1 and ABS & TRAC solenoid relay
(See page IN±31).

F00095
R±Y
3DLC1
J/CE1
ATs
J2211
II3 IK25
EC BRA15 BR
AR±Y
R±Y23 ABS & TRAC ECU
Ts
R±Y
3DLC1
J/CE1
ATs
J2211
II3 IK25
EC BRA15 BR
AR±Y
R±Y23 ABS & TRAC ECU
Ts
16
AB0119S08096
F00446
Ts
DLC1
E1
ON
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±615
850 Author: Date:
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with
the DTC check.
Connecting terminals Ts and E
1 of the DLC1 in the engine compartment starts the check.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals Ts and E
1 of DLC1.
OK:
Voltage: 10 ± 14 V
OK If ABS warning light does not blink even after Ts
and E
1 are connected, the ECU may be defec-
tive.
NG
DI04X±04

DI±616
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
851 Author: Date:
2 Check for open and short circuit in harness and connector between ABS &
TRAC ECU and DLC1, DLC1 and body ground (See page IN±31).
NG Repair or replace harness or connector.
OK
Check and replace ABS & TRAC ECU.

F00114
TRAC OFF
Indicator LightABS & TRAC ECU
CJ32 C10 R±L7
DLC2
17 J/CJ/C
2
IG3
TRC
Instrument Panel J/B
1D
J4 D319
L
A16
D R±L
C10LL
L
A16 TRAC Cut Switch
W±B12
11
LGWT
CSW
J7
J114 1
IGJ8
A 8
1JW±B
A J/C
1J7 Instrument Panel J/B
W±B
A J/CTRAC OFF
Indicator LightABS & TRAC ECU
C
C10 R±L7
DLC2
17 J/CJ/C
2
IG3
TRC
Instrument Panel J/B
1D
J4 D319
L
A16
D R±L
C10LL
L
A16 TRAC Cut Switch
W±B12
11
LGWT
CSW
J7
J114 1
IGJ8
A 8
1JW±B
A J/C
1J7 Instrument Panel J/B
W±B
A J/CTRAC OFF
Indicator LightABS & TRAC ECU
C
C10 R±L7
DLC2
17 J/CJ/C
2
IG3
TRC
Instrument Panel J/B
1D
J4 D319
L
A16
D R±L
C10LL
L
A16 TRAC Cut Switch
W±B12
11
LGWT
CSW
J7
J114 1
IGJ8
A 8
1JW±B
A J/C
1J7 Instrument Panel J/B
W±B
A J/CTRAC OFF
Indicator LightABS & TRAC ECU
C10 R±L7
DLC2
17 J/CJ/C
2
IG3
TRC
Instrument Panel J/B
1D
J4 D319
L
A16
D R±L
C10LL
L
A16 TRAC Cut Switch
W±B12
11
LGWT
CSW
J7
J114 1
IGJ8
A 8
1JW±B
A J/C
1J7 Instrument Panel J/B
W±B
A J/C
TRAC OFF
Indicator LightABS & TRAC ECU
C10
GAUGER±L7
DLC2
17 J/CJ/C
2
IG3
TRC
Instrument Panel J/B
1D
J4 D319
L
A16
D R±L
C10LL
L
A16 TRAC Cut Switch
W±B12
11
LGWT
CSW
J7
J114 1
IGJ8
A 8
1JW±B
A J/C
1J7 Instrument Panel J/B
W±B
A J/CJ32 J32
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI±617
852 Author: Date:
TRAC OFF Indicator, TRAC Cut Switch Circuit
CIRCUIT DESCRIPTION
This is the TRAC control main switch. When the TRAC cut switch is pushed on, TRAC control goes off and
the TRAC OFF indicator lights up. This indicator blinks for warnings when the trouble occurs and for
displaying DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check DTC.
Check DTC on page DI±574.
YES Repair circuit indicated by the code output.
NO
DI04Y±04

F00052
1 4
(+)(±) 32
DI±618
± DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
853 Author: Date:
2 Check TRAC cut switch.
PREPARATION:
(a) Remove TRAC cut switch.
(b) Disconnect TRAC cut switch connector.
CHECK:
Measure resistance between terminals 1 and 4 of TRAC cut
switch when TRAC cut switch is ON and OFF.
OK:
TRAC cut switchResistance
Pushed inContinuity
Released1 MW or higher
NG Replace TRAC cut switch.
OK
3 Check for open and short circuit in harness and connector between terminal
CSW of ABS & TRAC ECU and TRAC cut switch and body ground (See page
IN±29).
NG Repair or replace harness or connector.
OK
4 Check TRAC OFF indicator light.
See combination meter troubleshooting on page BE±2.
NG Repair or replace combination meter.
OK