1999 TOYOTA CAMRY ignition

Input SignalIndicator Light
Blinking Pattern
SET/COAST
switch
RESUME/ACCEL
switch
CANCEL switch2 Pulses
ON
OFF
ON
OFF3 Pulses
ON
OFFSW OFF
SW ON
AB0119
I00168
I00171
ON
CCS
(±) (+)
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±341
INSPECTION PROCEDURE
1 Input signal check.
PREPARATION:
See input signal check on page DI±319.
CHECK:
Check the indicator light operation when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned on.
OK:
SET/COAST, RESUME/ACCEL switch
The signals shown in the table on the left should be
output when each switch is ON. The signal should
disappear when the switch is turned OFF.
CANCEL switch
The indicator light goes off when the cancel switch is
turned ON.
OK Wait and see.
NG
2 Check voltage between terminals CCS of cruise control ECU connector and body
ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals 18 of ECU connector and
body ground, when each of the SET/COAST, RESUME/AC-
CEL and CANCEL is turned ON.
Switch positionResistance (V)
Neutral10 ± 16 V
RES/ACC0.8 ± 3.7 V
SET/COAST2.5 ± 6.3 V
CANCEL4.2 ± 8.8 V
NG Proceed to next circuit inspection shown on
problem symptoms table (See page DI±328).
OK

AB0119
I00167
I00172
ON
IDL
(±) (+)
DI±344
± DIAGNOSTICSCRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminal IDL of cruise control ECU connector and body
ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Disconnect the ECM connector.
(c) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL of ECU connector and
body ground when the throttle valve is fully closed and fully
opened.
OK:
Throttle valve positionVoltage
Fully opened10 ± 14 V
Fully closedBelow 2 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±328).
NG
2 Check harness and connector between ECM and throttle position sensor (See
page IN±29).
NG Repair or replace harness or connector.
OK
3 Check throttle position sensor circuit (See page DI±39).
NG Replace throttle position sensor.
OK

AB0119
I00142
I00173
ON
STP±
(±) (+)
DI±348
± DIAGNOSTICSCRUISE CONTROL SYSTEM
3 Check voltage between terminal STP± of cruise control ECU connector and
body ground.
PREPARATION:
(a) Remove the ECU with connectors still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal STP± of cruise control ECU
connector and body ground, when the brake pedal is de-
pressed and released.
OK:
Depressed10 ± 14 V
ReleasedBelow 1 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±328).
NG
4 Check for open in harness and connectors between terminal STP± of cruise con-
trol ECU and stop light switch (See page IN±29).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN±29).

AB0119
I00143
I00174
ON
O/D
(±) (+)
DI±350
± DIAGNOSTICSCRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check operation of overdrive.
PREPARATION:
Test drive after engine warms up.
CHECK:
Check that overdrive ON e OFF occurs by operation of OD switch ON±OFF.
NG Check and repair electronically controlled
transmission (See page DI±133).
OK
2 Check voltage between terminal OD of harness side connector of cruise control
ECU and body ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
(c) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal OD of harness side connec-
tor of ECU and body ground.
OK:
Voltage: 10 ± 14 V
NG Go to step 5.
OK

I08463
R±LJ19
J/C
DD
R±LPNP Switch
210
B±R9
IG2
B±RJ22
J/C
B±R3
C16Cruise Control ECU
D
R±LR±L 2
IG2F
J24 J24J/C
FInstrument Panel J/B
1
1
1J 1KGAUGE
B±Y
Ignition Switch
AM1 IG1
24
W Instrument Panel J/B
12
1B 1K
B±R
1
F14FL BLOCK
ALT1
F9
B±GFL MAIN
Battery AM1AA DI±352
± DIAGNOSTICSCRUISE CONTROL SYSTEM
Park/Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is except D, a signal is sent from the park/neutral position switch to the ECU. When
this signal is input during cruise control driving, the ECU cancels the cruise control.
WIRING DIAGRAM
DI08V±12

AB0119
I00139
I00175
ON
D
(±) (+)
DI±354
± DIAGNOSTICSCRUISE CONTROL SYSTEM
3 Check voltage between terminal D of cruise control ECU connector and body
ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of ECU connector and
body ground when shifting into D position and other positions.
OK:
Shift PositionVoltage
D position10 ± 14 V
Other positionsBelow 1 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±328).
NG
4 Check harness and connector between cruise control ECU and park/neutral
position switch (See page IN±29).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN±29).

I08464
Ignition Switch
24
AM1IG1
B±YInstrument Panel J/B
1
1K
B±G
FL MAIN
BatteryECU±IG
1J9
B±RCCJ12
J/C
B±RCruise Control ECU
9
C16
B
GND W
FL BLOCK
1
F91
F14
B±RInstrument Panel J/B
1
1B2
1K AM1
IFJ9
J/C
W±BA
1J7 Instrument Panel J/B
1J8
W±BAA J/C
J6J7
W±B16
C16
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±355
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc, when terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI08X±12

I00157
Instrument panel junction block No.1:
ECU±IG
Fuse
AB0119
I00147
I00176
ON
GND
(±) (+)B
DI±356
± DIAGNOSTICSCRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check ECU±IG fuse.
PREPARATION:
Remove the ECU±IG fuse from instrument panel junction block
No.1.
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.
OK
2 Check voltage between terminals B and GND of cruise control ECU connector.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals B and GND of ECU con-
nector.
OK:
Voltage: 10 ± 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±328).
NG