1997 TOYOTA SUPRA clutch

P19604
A/C Amplifier
5 V
6
A14L-R31
II1L-R34
AAC1ECM
E1
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-313
541 Author
: Date
:
1997 SUPRA (RM502U)
A/C Cut Control Circuit
CIRCUIT DESCRIPTION
This circuit cuts air conditioning operation during vehicle acceleration in order to increase acceleration per-
formance. During acceleration with the vehicle speed at 25 km/h (16 mph) or less, engine speed at 1,200
rpm or less and throttle valve opening angle at 60° or more, the A/C magnet switch is turned OFF for several
seconds.
WIRING DIAGRAM
INSPECTION PROCEDURE
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and check operation of air conditioning
cut control.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push TOYOTA hand-held tester main switch ON.
(c) Start the engine and air conditioning switch ON.
HINT:
A/C magnetic clutch is turned ON.
(d) Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Check operation of A/C magnetic clutch cut when air conditioning cut control is operated by the TOYOTA
hand-held tester.
OK:
A/C magnetic clutch is turned OFF.
DI4TW-01

N19900
1K
1J
IJ2P2P2
C9C9IJ1
EA122
2IB2IF2
I19I19IB1
2
2A
S2S3 4
6
87 B1365
1223
1
2
3510Theft Deterrent and
Door Lock ECU
EA2
EA3
4Starter Relay MAINL-OSRLY
25
Clutch Start Switch(M/T)
21AM2 J/B No.1 STR/B No.2
2
1
2JZ-GTE
2JZ-GE
Battery1
2 B
BL-O
L-O B-WB-WW-R
W-R W-B
B
B B 1 Ignition
SwitchT13
Park/Neutral Start Switch
1
1 B
(A/T)
12
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-619
847 Author
: Date
:
1997 SUPRA (RM502U)
Starter Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact ºaº in the ECU becomes open, creating an open circuit
in terminal ST circuit and making the starter inoperative (starter cut).
In this condition, if one of the following operations is done, the contact ºaº in the ECU is grounded, thus can-
celing the starter cut:
(1) The front LH and RH door is unlocked with a key.
WIRING DIAGRAM
DI4X2-01

I02735
I02735
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-665
893 Author
: Date
:
1997 SUPRA (RM502U)
(d) Inspect the CANCEL switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.

Depress the brake pedal

Depress the clutch pedal (M/T)

Shift to except D position (A/T)

Turn the main switch OFF

Pull the cruise control switch to CANCEL
(e) Inspect the RESUME switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.

Depress the brake pedal

Depress the clutch pedal (M/T)

Shift to except D position (A/T)

Turn the main switch OFF

Pull the cruise control switch to CANCEL
(4) After the control switch is turned to RES/ACC at the
driving speed of more than 40 km/h (25 mph), check
that the vehicle restores the speed prior to the can-
cellation.

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.

DI4XM-01
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-667
895 Author
: Date
:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below and proceed to the appropriate page.
DTC No.
(See Page)Detection ItemTrouble Area
11, 15
(DI-673)
Actuator Motor Circuit

Cruise control actuator motor

Harness or connector between actuator motor and ECU

ECU
12
(DI-675)
Actuator Magnetic Clutch Circuit

Cruise control magnetic clutch

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

ECU
14
(DI-677)
Actuator Motor Circuit

Cruise control actuator motor

Harness or connector between actuator motor and ECU

ECU
21
(DI-679)
Vehicle Speed Sensor Circuit

Vehicle speed sensor

ECU

Combination meter

Harness or connector between vehicle speed sensor and
ECM, ECM and combination meter, combination meter and
ECU

ECU
23
(DI-681)
Vehicle Speed Sensor Circuit

Vehicle speed sensor

Harness or connector (SPD)

ECU
32
(DI-682)
Control Switch Circuit (Cruise Control Switch)

Cruise control switch

Harness or connector between control switch and ECU

ECU
41
Cruise Control ECU
ECU
42
Source voltage drop
Power source
51
(DI-685)
Idle switch circuit

Throttle position sensor

Harness or connector between cruise control ECU and
throttle position sensor

ECU
HINT:

1. When 2 or more codes are indicated, the lowest numbered code will be displayed first.

2. If the inspection ºProceed to next circuit inspection shown on matrix chartº is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue check.

3. If the trouble still reappears even though there are no abnormalities in any of the other circuit, then
check or replace the cruise control ECU as the last step.

(*) When the vehicle speed decrease on uphill roads, the speed can be set again and driving contin-
ued. (This is not a malfunction.)

DI4XN-01
I02713 I02713
DLC1
Cruise Control
ActuatorR/B No.2

DOME Fuse
Cruise Control ECU
Cruise Control Switch
Clutch Switch
Vehicle Speed Sensor
Park/Neutral Position SwitchStop Light Switch J/B No.1

ECU-B Fuse

ECU-IG Fuse DI-668
- DIAGNOSTICSCRUISE CONTROL SYSTEM
896 Author
: Date
:
1997 SUPRA (RM502U)
PARTS LOCATION

DI4XO-01
I04621
C16
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-669
897 Author
: Date
:
1997 SUPRA (RM502U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
D e GNDGRWB
M/T: Depress clutch pedal
A/T: Shift to except D positionBelow 1 VD e GND
(C16-2 eC16-13)G-R e W-BM/T: Release clutch pedal
A/T: Shift to D position10 - 16 V
PI e GNDOWB
Ignition switch ON
Cruise control main switch ONBelow 1.2 VPI e GND
(C16-7 eC16-13)O e W-BIgnition switch ON
Cruise control main switch OFF10 - 16 V
TCGNDIgnition switch ON10 - 16 VTC e GND
(C16-8 eC16-13)R e W-BIgnition switch ON
Connect terminals TC and E
1 of DLC1Below 1 V
OD e GNDLG BWB
During cruise control driving
OD switch ON10 - 16 VOD e GND
(C16-9 eC16-13)LG-B e W-BDuring cruise control driving
OD switch OFF (3rd driving)Below 1 V
L e GNDBWWBDuring cruise control driving9 - 15 VL e GND
(C16-10 eC16-13)B-W e W-BExcept during cruise control drivingBelow 1 V
MC e GNDGRWB
During cruise control driving
COAST switch hold ON9 - 15 VMC e GND
(C16-1 1 eC16-13)G-R e W-BDuring cruise control driving
ACC switch hold ONBelow 1 V
MO e GNDLGWB
During cruise control driving
ACC switch hold ON9 - 15 VMO e GND
(C16-12 eC16-13)LG e W-BDuring cruise control driving
COAST switch hold ONBelow 1 V
GND e Body Ground
(C16-13 eBody Ground)W-B e Body
GroundConstantBelow 1 V
B e GND
(C16-14 eC16-13)B-R e W-BIgnition switch ON10 - 16 V
BATT e GND
(C16-15 eC16-13)W-R e W-BConstant10 - 16 V
STP e GNDG-W e W-BDepress brake pedal10 - 16 VSTP e GND
(C16-16 eC16-13)G-W e W-BRelease brake pedalBelow 1 V

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