Page 2497 of 4592
I00052
Throttle Position Sensor
3
4
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±345
4 Check throttle position sensor.
PREPARATION:
Disconnect the throttle position sensor connector.
CHECK:
Measure resistance between terminals 3 and 4 of throttle posi-
tion sensor connector when the throttle valve is fully closed and
fully opened.
OK:
Throttle valve positionResistance
Fully opened1 MW or higher
Fully closedBelow 2.3 kW
NG Replace throttle position sensor.
OK
5 Check for open and short in harness and connector between cruise control ECU
and ECM (See page IN±29).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN±29).
Page 2498 of 4592

I08461
A
J6A
J6 J/C
J/CJ9
A
W±BW±B
Instrument Panel J/B
7
1J
1J8
IF Battery FL MAIN B±G1
F9FL BLOCK
ALT
F141B±R 7
1C4
1B Instrument Panel J/B
STOP W2
3Stop Light Switch
1
4G±W1R4 Instrument Panel J/B
5
1R
R±Y
G±B
W±BCruise Control
Actuator
3
4G±WAA J23
J/C
G±W2
C16
C16
8Cruise Control ECU
STP±
L
DI±346
± DIAGNOSTICSCRUISE CONTROL SYSTEM
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECU. When the ECU receives
this signal, it cancels the cruise control.
A fail±safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP±
When the brake is ON, battery positive voltage normally is applied through the STOP fuse and stop light
switch to terminal STP± of the ECU, and the ECU turns the cruise control OFF.
If the harness connected to terminal STP± has an open circuit, terminal STP± will have battery positive volt-
age and the cruise control will be turned OFF.
Also, when the brake is ON, the magnetic clutch circuit is cut mechanically by the stop light switch, turning
the cruise control OFF. (See page DI±331 for operation of the magnetic clutch)
WIRING DIAGRAM
DI08T±12
Page 2499 of 4592
Input SignalIndicator Light
Blinking Pattern
Stop Light
switch ON
LightOFF
ONSW OFF
SW ON
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±347
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light comes ON when brake pedal is depressed, and turns OFF when brake pedal is re-
leased.
NG Check stop light system (See page BE±1).
OK
2 Input signal check.
CHECK:
(a) See input signal check on DI±319.
(b) Check the indicator light when the brake pedal is de-
pressed.
OK:
The indicator light goes OFF when the brake pedal is
depressed.
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±328).
NG
Page 2500 of 4592
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).
Page 2501 of 4592

I08462
ECM
OD120
E4
S26
E6L±BY±B
J19
J/C
B
L±BBCruise Control ECU
14
C16OD
ECT 7
IG2
ECT No.2
SolenoidL±B L±B6
C16
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±349
Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTION
When driving uphill under the cruise control, in order to reduce shifting due to ON±OFF overdrive operation
and to provide smooth driving, when down shifting in the electronically controlled transmission occurs, a sig-
nal to prevent upshift until the end of the uphill slope is sent from the cruise control ECU to the electronically
controlled transmission.
Terminal ECT of the cruise control ECU detects the shift change signal (output to electronically controlled
transmission No. 2 solenoid) from the ECM.
If the vehicle speeds down, also when terminal ECT of the cruise control ECU receives down shifting signal,
it sends a signal from terminal OD to ECM to cut overdrive until the end of the uphill slope, and the gear shifts
are reduced and gear shift points in the electronically controlled transmission are changed.
WIRING DIAGRAM
DI08U±12
Page 2502 of 4592
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
Page 2503 of 4592
I00141
ECT
(±) (+)
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±351
3 Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).
PREPARATION:
(a) Connect the ECU connector.
(b) Test drive after engine warms up.
CHECK:
Check voltage between terminal ECT of ECU connector and
body ground when OD switch is ON and OFF.
OK:
OD switch positionVoltage
ON8 ± 14 V
OFFBelow 0.5 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±328).
NG
4 Check harness and connector between terminal ECT of cruise control ECU and
electronically controlled transmission solenoid (See page IN±29).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
5 Check harness and connector between terminal OD of cruise control ECU and
terminal OD1 of ECM (See page IN±29).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN±29).
Page 2504 of 4592
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