Page 985 of 1807
I02725
Ignition Switch5
1JGAUGE
12
1E12
1H J/B No.1
Y
(M/T)1
C15
C152 Cruise Control Clutch Start Switch (M/T)
(M/T)G-R
G-R(A/T)
7IJ2 Y
23
II1
Y
(A/T)4
P2 P29 Park/Neutral Position Switch (A/T)
G-R2
C16
DCruise Control ECU
Y
*1: 2JZ-GTE Engine
*2: 2JZ-GE Engine
DI-694
- DIAGNOSTICSCRUISE CONTROL SYSTEM
922 Author: Date:
1997 SUPRA (RM502U)
Park/Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is put in except D position, 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
INSPECTION PROCEDURE
1 Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG Proceed to engine troubleshooting
(2JZ-GE: See page DI-24,
2JZ-GTE: See page DI-169).
OK
DI4XZ-01
Page 986 of 1807
Input SignalIndicator Light
Blinking Pattern
Turn PNP switch
OFF (Shift to
except D range)LightON
OFFSW ON
SW OFF
I02726
ON
(-)
D (+)
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-695
923 Author: Date:
1997 SUPRA (RM502U)
2 Input signal check.
PREPARATION:
See input signal check on page DI-662.
CHECK:
Check the indicator light when shifting into except D position.
OK:
The indicator light goes off when shifting into except
D position.
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-671).
NG
3 Check voltage between terminal D of cruise control ECU and body ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of cruise control ECU con-
nector 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-671).
NG
Page 987 of 1807
DI-696
- DIAGNOSTICSCRUISE CONTROL SYSTEM
924 Author: Date:
1997 SUPRA (RM502U)
4 Check harness and connector between PNP switch and cruise control ECU
(See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN-28).
Page 988 of 1807

Input Signal
Indicator Light
Blinking Pattern
Clutch switch
OFF (Depress
clutch pedal)
LightON
OFFSW ON
SW OFF
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-697
925 Author: Date:
1997 SUPRA (RM502U)
Clutch Switch Circuit
CIRCUIT DESCRIPTION
When the clutch pedal is depressed, the clutch switch sends a signal to the cruise control ECU. When the
signal is input to the cruise control ECU during cruise control driving, the cruise control ECU cancels cruise
control.
WIRING DIAGRAM
Refer to park/neutral position switch circuit on page DI-694.
INSPECTION PROCEDURE
1 Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG Proceed to engine troubleshooting
(2JZ-GE: See page DI-24,
2JZ-GTE: See page DI-169).
OK
2 Input signal check.
PREPARATION:
See input signal check on page DI-662.
CHECK:
Check the indicator light when the clutch pedal is depressed.
OK:
The indicator light goes off when the clutch pedal is
depressed.
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-671).
NG
DI4Y0-01
Page 989 of 1807
I02726
ON
(-)
D (+)
DI-698
- DIAGNOSTICSCRUISE CONTROL SYSTEM
926 Author: Date:
1997 SUPRA (RM502U)
3 Check voltage between terminal D of cruise control ECU and body ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of cruise control ECU con-
nector and body ground when the clutch pedal is depressed.
OK:
Shift PositionVoltage
ON (Pedal depressed)Below 1 V
OFF10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-671).
NG
4 Check for open in harness and connector between ECU and GAUGE fuse
(See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN-28).
Page 990 of 1807
N19616
21B1J
I19I19
1J1I
1J 1H
C16 C16Cruise Control ECU
Cruise Control Switch
Battery R/B No.244
113 2
459
W14
13
IE
W-BW-B J/B No.1 Ignition Switch J/B No.1J/B No.1
AM1
ALTGNDB
2
2
2AW-B
W-B W
B-YB-R ECU-IG
B W
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-699
927 Author: Date:
1997 SUPRA (RM502U)
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
DI4Y1-01
Page 991 of 1807
N08843
J/B No.1
ECU-IG Fuse
I02728
ON
GND (-)
B (+)
DI-700
- DIAGNOSTICSCRUISE CONTROL SYSTEM
928 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check ECU-IG fuse.
PREPARATION:
Remove ECU-IG fuse from 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:
Remove cruise control ECU with connector still connected.
CHECK:
(a) Turn ignition switch ON.
(b) Measure voltage between terminals B and GND of cruise
control ECU connector.
OK:
Voltage 10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-671).
NG
Page 992 of 1807
N19842
GND
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-701
929 Author: Date:
1997 SUPRA (RM502U)
3 Check resistance between terminal GND of cruise control ECU connector and
body ground (See page IN-28).
CHECK:
Measure resistance between terminal GND of cruise control
ECU connector and body ground.
OK:
Resistance: Below 1 W
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween battery and cruise control ECU
(See page IN-28).