1997 TOYOTA SUPRA turn signal

BE6443
(1)
(2)
(1)
No.
Operation MethodCRUISE MAIN Indicator Light
Blinking PatternDiagnosis
1
3
4
2Turn SET/COAST switch ON
Turn RES/ACC switch ON
Drive at about 40 km/h
(25 mph) or below Turn CANCEL switch ON
Turn stop light switch ON
Depress brake pedal
Turn PNP switch OFF
(Shift to except D position)
Turn clutch switch OFF
(Depress clutch pedal)
Drive at about 40 km/h
(25 mph) or higherSET / COAST switch
circuit is normal
RES / ACC switch circuit
is normal
PNP switch circuit is normal CANCEL switch circuit
is normal
Clutch switch circuit is normal
Vehicle Speed Sensor is
normal
Stop light switch circuit
is normal ON
OFF
0.25 sec.
0.25 sec.
1 sec.Light
ON
OFFLight
ON
OFF Light
ON
OFF Light
ON
OFF Light
ON
OFF Light
Switch OFF
Switch ON
Switch ON
Switch OFF DI-666
- DIAGNOSTICSCRUISE CONTROL SYSTEM
894 Author
: Date
:
1997 SUPRA (RM502U)
5. Using TOYOTA hand-held tester:
INPUT SIGNAL CHECK
HINT:
(1) For check No.1 - No.2

Turn the ignition switch ON.
(2) For check No.3

Turn ignition switch ON.

Shift to D position.
(3) For check No.4

Jack up the vehicle.

Start the engine.

Shift to D position.
(a) Press the control switch to SET/COAST or RES/ACC
position and hold it down or hold it up º1º.
(b) Push the main switch ON º2º.
(c) Check that the CRUISE MAIN indicator light blinks twice
or 3 times repeatedly after 3 seconds.
(d) Turn the SET/COAST or RES/ACC switch OFF.
(e) Operate each switch as listed in the table below.
(f) Read the blinking pattern of the CRUISE MAIN indicator
light.
(g) After performing the check, turn the main switch OFF.
HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed first.

DI4XP-01
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-671
899 Author
: Date
:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Cruise control system does not set.
Cruise control system does not operate.
Input signal check No.4: OK
1. ECU Power Source Circuit
2. Wire Harness
3. Main Switch Circuit
4. Control Switch Circuit
5. Stop Light Switch Circuit
6. PNP Switch or Clutch Switch Circuit
7. Actuator Control Cable
8. Actuator Motor Circuit
9. Cruise Control ECU
Input signal check No.4: NG
1. Vehicle Speed Sensor Circuit
2. Cruise Control ECU
DI-699
DI-704
DI-682
DI-687
DI-694,
DI-697
DI-710
DI-673
IN-28
DI-679
IIN-28
Indicator light does not light up.
1. Wire Harness
2. CRUISE MAIN Indicator Light Circuit
3. Cruise Control ECU
DI-706
IIN-28
Vehicle speed drop when the cruise control switch turned to SET.
1. Actuator Control Cable
2. ECU Power Source Circuit
3. Idle Signal Circuit
4. Actuator Motor Circuit
5. Cruise Control ECUDI-710
DI-699
DI-685
DI-673
IN-28
Set speed deviates on high or low side.
Input signal check No.4: OK
1. Vehicle Speed Sensor Circuit
2. Actuator Control Cable
3. ECU Power Source Circuit
4. Actuator Motor Circuit
5. Cruise Control ECU
Input signal check No.4: NG
1. Cruise Control ECU
DI-679
DI-710
DI-699
DI-673
IN-28
IN-28
Vehicle speed fluctuates when cruise control switch turn to SET.
1. Vehicle Speed Sensor Circuit
2. Actuator Control Cable
3. Idle Signal Circuit
4. ECT Communication Circuit
5. Actuator Motor Circuit
6. Cruise Control ECUDI-679
DI-710
DI-685
DI-690
DI-673
IN-28
Acceleration response is sluggish when cruise control switch turn
to ºACCELº or ºRESUMEº.
Input signal check No.4: OK
1. Actuator Control Cable
2. Vehicle Speed Sensor Circuit
3. Actuator Motor Circuit
4. Cruise Control ECU
Input signal check No.4: NG
1. Control Switch Circuit
2. Cruise Control ECU
DI-673
DI-679
DI-710
IN-28
DI-682
IN-28
Set speed does not cancel when brake pedal depressed.
Input signal check No.3: OK
1. Cruise Control ECU
Input signal check No.3: NG
1. Stop Light Switch Circuit
2. Cruise Control ECU
IN-28
DI-687
IIN-28
Cruise control does not cancel when transmission is shifted to
except D position. (A/T)
Input signal check No.3: OK
1. Cruise Control ECU
Input signal check No.3: NG
1. PNP Switch Circuit
2. Cruise Control ECU
IIN-28
DI-694
IN-28

DI-672
- DIAGNOSTICSCRUISE CONTROL SYSTEM
900 Author
: Date
:
1997 SUPRA (RM502U) Cruise control does not cancel when clutch pedal depressed.
Input signal check No.3: OK
1. Cruise Control ECU
Input signal check No.3: NG
1. Clutch Switch Circuit
2. Cruise Control ECU
IN-28
DI-697
IN-28
Cruise control does not cancel when cruise control switch turned
to CANCEL.
Input signal check No.3: OK
1. Cruise Control ECU
Input signal check No.3: NG
1. Control Switch Circuit
2. Cruise Control ECU
IN-28
DI-682
IN-28
Vehicle speed does not decrease when cruise control switch
turned to COAST.
Input signal check No.1: OK
1. Actuator Motor Circuit
2. Actuator Control Cable
3. Vehicle Speed Sensor Circuit
4. Cruise Control ECU
Input signal check No.1: NG
1. Control Switch Circuit
2. Cruise Control ECU
DI-673
DI-710
DI-679
IIN-28
DI-682
IN-28
Vehicle speed does not accelerate when cruise control switch
turned to ACCEL.
Input signal check No.2: OK
1. Actuator Motor Circuit
2. Actuator Control Cable
3. Vehicle Speed Sensor Circuit
4. Cruise Control ECU
Input signal check No.2: NG
1. Control Switch Circuit
2. Cruise Control ECU
DI-673
DI-710
DI-679
IIN-28
DI-682
IN-28
Vehicle speed does not return to memorized speed when cruise
control switch turned to RESUME.
Input signal check No.2: OK
1. Actuator Motor Circuit
2. Actuator Control Cable
3. Vehicle Speed Sensor Circuit
4. Cruise Control ECU
Input signal check No.2: NG
1. Control Switch Circuit
2. Cruise Control ECU
DI-673
DI-710
DI-679
IN-28
DI-682
IN-28
Speed can be set below about 40 km/h (25 mph).
Input signal check No.4: OK
1. Cruise Control ECU
Input signal check No.4: NG
1. Vehicle Speed Sensor Circuit
2. Cruise Control ECU
IN-28
DI-679
IN-28
Cruise control does not cancel when speed is less than 40 km/h
(25 mph).
Input signal check No.4: OK
1. Actuator Motor Circuit
2. Cruise Control ECU
Input signal check No.4: NG
1. Vehicle Speed Sensor Circuit
2. Cruise Control ECU
DI-673
IIN-28
DI-679
IIN-28

I02715
Cruise Control Actuator
Magnetic ClutchGND4
C4
C43
LBR-Y
R-L17
IB6
8
IB6W-B
R-L
Battery
STOP10
1I
J/B No.1WCruise Control ECU
13
43
21 S11
S11S11
S11
Stop Light SwitchB-W
G-W G-WC16
C16
C1610
16
To Light Failure SensorGND
L
STP-
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-675
903 Author
: Date
:
1997 SUPRA (RM502U)
DTC 12 Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stoplight switch turns on, supplying electrical power to the stoplight.
Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (6 mph) above the set speed,
then cruise control at the set speed is resumed.
DTC No.Detection ItemTrouble Area
12Short in magnetic clutch circuit
Open (0.8 sec.) in magnetic clutch circuit

Cruise contorl actuator magnetic clutch

Harness or connector between ECU and magnetic clutch,
magnetic clutch and body ground

Cruise control ECU
WIRING DIAGRAM
DI4XR-01

Input SignalIndicator Light
Blinking Pattern
SET/COAST
switch
RESUME/ACCEL
switch
CANCEL switch2 Pulses
ON
OFF
ON
OFF3 Pulses
ON
OFFSW OFF
SW ON
N16045
3 4
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-683
911 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Input signal check.
PREPARATION:
See input signal check on page DI-662.
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 control switch.
PREPARATION:
(a) Remove steering wheel center pad (See page SR-1 1).
(b) Disconnect control switch connector.
CHECK:
Measure resistance between terminals 3 and 4 of control switch
connector when control switch is operated.
Switch positionResistance (W)
Neutral8 (No continuity)
RES/ACC50 - 80
SET/COAST180 - 220
CANCEL400 - 440
OK Repair control switch.
NG

I02720
IDL164
E9R-B*
1
R*2
R-B*1
2*2T2
IDL
Throttle Position Sensor3
IJ1R-B21
C16
IDL Cruise Control ECU
3*1
R-B*1
R*2R*2
*1: 2JZ-GE Engine
*2: 2JZ-GTE Engine ECM
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-685
913 Author
: Date
:
1997 SUPRA (RM502U)
DTC 51 Idle Signal Circuit
CIRCUIT DESCRIPTION
When the idle switch in turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the dis-
crepancy between the throttle valve position and the actuator position sensor value to enable accurate
cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the en-
gine, so also inspect the engine.
DTC No.Detection ItemTrouble Area
51Short in idle signal circuit

Harness or connector between cruise control ECU and
throttle position sensor

Throttle position sensor

Cruise control ECU
WIRING DIAGRAM
DI4XW-01

N19613
22
1 2
4
3
10 16Cruise Control ECU
1B
I1 S11
S11G-W
B-W
Cruise Control Actuator R/B No.2
Battery
B 2A2
ALT
W-LJ/B No.1
STOP10
C16
L STP-
2 W-L
S11 S11
C16
POWERR-LR-LWStop Light Switch
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-687
915 Author
: Date
:
1997 SUPRA (RM502U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake is on, battery positive voltage normally applies through the STOP fuse and stop light switch
to terminal STP- of the ECU, and the ECU turns the cruise control off.
A fail-safe function is provided so that cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
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 is cut mechanically by the stop light switch, turning the cruise
control off. (See page DI-675 for operation of the magnetic clutch)
WIRING DIAGRAM
DI4XX-01

Input SignalIndicator Light
Blinking Pattern
Stop Light
switch ON
LightOFF
ONSW OFF
SW ON
DI-688
- DIAGNOSTICSCRUISE CONTROL SYSTEM
916 Author
: Date
:
1997 SUPRA (RM502U)
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 released.
NG Check stop light system.
OK
2 Input signal check.
CHECK:
(a) See input signal check on DI-662.
(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-671).
NG