Page 993 of 1807
N19617
Battery2A1B 1H
C16
15
8
2
2 2
2R/B No.2
J/B No.1Cruise Control ECU
ECU-B
W-R
B1ALTPOWER
BATT W-L
W DI-702
- DIAGNOSTICSCRUISE CONTROL SYSTEM
930 Author: Date:
1997 SUPRA (RM502U)
Back-up Power Source Circuit
CIRCUIT DESCRIPTION
The ECU back-up power source provides power even when the ignition is off and is used for DTC memory,
etc..
WIRING DIAGRAM
DI4Y2-01
Page 994 of 1807
N09001
J/B No.2
DOME Fuse
N19843
(-)
BATT (+)
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-703
931 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check DOME fuse.
PREPARATION:
Remove DOME fuse from relay block No.2.
CHECK:
Check continuity of DOME fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the DOME fuse.
OK
2 Check voltage between terminal BATT of cruise control ECU connector and body
ground (See page IN-28).
PREPARATION:
Remove cruise control ECU with connector still connected.
CHECK:
Measure voltage between terminal BATT of cruise control ECU
connector and body ground.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-671).
NG
Check and repair harness and connector be-
tween battery and cruise control ECU
(See page IN-28).
Page 995 of 1807
I02730
ON
(-)
CMS (+)
DI-704
- DIAGNOSTICSCRUISE CONTROL SYSTEM
932 Author: Date:
1997 SUPRA (RM502U)
Main Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
When the cruise control main switch is turned off, the cruise control does not operate.
WIRING DIAGRAM
See page DI-682.
INSPECTION PROCEDURE
1 Check voltage between terminal CMS of cruise control ECU connector and body
ground.
PREPARATION:
Remove cruise control ECU with connector still connected.
CHECK:
(a) Turn ignition switch ON.
(b) Measure voltage between terminal CMS of cruise control
ECU connector when main switch is held on and off.
OK:
Main switchVoltage
OFF10 - 14 V
ONBelow 1 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-671).
NG
DI4Y3-01
Page 996 of 1807
N15969
3
5
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-705
933 Author: Date:
1997 SUPRA (RM502U)
2 Check main switch continuity.
PREPARATION:
(a) Remove steering wheel center pad (See page SR-1 1).
(b) Disconnect cruise control switch connector.
CHECK:
Check continuity between terminals 3 and 5 of cruise control
switch connector when main switch is held on and off.
OK:
Switch positionTester connectionSpecified condition
OFF3 - 5No continuity
Hold ON3 - 5Continuity
NG Replace control switch.
OK
3 Check harness and connector between cruise control ECU and main switch
(See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN-28).
Page 997 of 1807
N19618
I18
I18
1J
1B1J 1E C10C12 IF2
2A 4 4 2 4512 96
11
107
O DLC2
PI Cruise Control ECU
1
2 2 2R/B No.2 J/B No.1Vehicle Speed SensorY
RBR 4
WIgnition Switch
AM1ALTBattery
IF
GAUGEJ/B No.1
C10 C12C16 W
BR
BR I8
W
BOOO Combination Meter
CRUISE Indicator
CRUISE
R DI-706
- DIAGNOSTICSCRUISE CONTROL SYSTEM
934 Author: Date:
1997 SUPRA (RM502U)
CRUISE MAIN Indicator Light Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned ON, CRUISE MAIN indicator light lights up.
WIRING DIAGRAM
DI4Y4-01
Page 998 of 1807
I02732
ON
(-) PI (+)
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-707
935 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check voltage between terminals PI and GND of cruise control ECU connector.
PREPARATION:
Ignition switch ON.
CHECK:
Measure voltage between terminals PI and GND of cruise con-
trol ECU connector when main switch on and off.
OK:
Switch positionVoltage
OFF10 - 16 V
ONBelow 1.2 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-671).
NG
2 Check combination meter (See page BE-43).
NG Replace combination meter.
OK
Check and replace cruise control ECU
(See page IN-28).
Page 999 of 1807
I02733
DLC2
DLC1TC4
D5R
TC11
D1P-B*
121
II111
IF1RR8
C16Cruise Control ECU
TC
P-B
R*
2
*1: 2JZ-GTE
*2: 2JZ-GE DI-708
- DIAGNOSTICSCRUISE CONTROL SYSTEM
936 Author: Date:
1997 SUPRA (RM502U)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that DTC output is required.
WIRING DIAGRAM
DI4Y5-01
Page 1000 of 1807
N15970
DLC1
E
1Tc
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-709
937 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC2.
CHECK:
(a) Turn ignition switch ON.
(b) Measure voltage between terminals Tc and E
1 of DLC2.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-671).
NG
2 Check harness and connector between cruise control ECU and DLC2, DLC2 and
body ground (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN-28).