TOYOTA SUPRA 1997 Service Repair Manual
Page 981 of 1807
N19614
ECM
E10
E9IJ2
IJ2C16
C16
E2
E2 12
9
8
2229 11
10Cruise Control ECU
OD
ECT BR-B*1LG-B
LG-B*1(A/T)
R-L
(A/T) OD1
S2
*1: 2JZ-GTE Engine
*2: 2JZ-GE Engine R-L
(A/T)R-L
(A/T)
Electronically Controlled Transmission Solenoid*1
*2
S2 DI-690
- DIAGNOSTICSCRUISE CONTROL SYSTEM
918 Author: Date:
1997 SUPRA (RM502U)
Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTION
When driving uphill under 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 signal
to prevent upshift until the end of the uphill slope is sent from the cruise control ECU to the electronically
controlled transmission.
Terminal ECM of the cruise control ECU detects the shift change signal (output to electronically controlled
transmission No.2 solenoid) from the electronically controlled transmission.
If vehicle speed down, also when terminal electronically controlled transmission of the cruise control ECU
receive 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
DI4XY-01
Page 982 of 1807
I02724
ON
(-)
OD (+)
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-691
919 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check operation of overdrive.
PREPARATION:
Test drive after engine warms up.
CHECK:
Check that overdrive ON e OFF occurs with operation of OD switch ON e OFF.
NG Check and repair electronically controlled
transmission (See page DI-371).
OK
2 Check voltage between terminal OD of harness side connector of cruise control
ECU and body ground.
PREPARATION:
Remove cruise control ECU with connector still connected.
CHECK:
(a) Disconnect cruise control ECU connector.
(b) Turn ignition switch ON.
(c) Measure voltage between terminal OD of harness side
connector of cruise control ECU and body ground.
OK:
Voltage: 10 - 14 V
NG Go to step 5.
OK
Page 983 of 1807
N19837
(-)ECT (+)
DI-692
- DIAGNOSTICSCRUISE CONTROL SYSTEM
920 Author: Date:
1997 SUPRA (RM502U)
3 Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).
PREPARATION:
(a) Connect cruise control ECU connector.
(b) Test drive after engine warms up.
CHECK:
Check voltage between terminal ECT of cruise control 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-671).
NG
4 Check harness and connector between terminal ECT of cruise control ECU and
electronically controlled transmission solenoid (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
Page 984 of 1807
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-693
921 Author: Date:
1997 SUPRA (RM502U)
5 Check harness and connector between terminal OD of cruise control ECU and
terminal OD1 of ECM (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN-28).
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