1997 TOYOTA SUPRA check engine

N09348
TOYOTA
hand-held tester
TOYOTA
break-out-boxECU
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-61 1
839 Author
: Date
:
1997 SUPRA (RM502U)
4. CHECK OF THE THEFT DETERRENT SYSTEM OPERATION.
HINT:
Check if the theft deterrent indicator light is blinking.
When any of the following operations (a) or (b) is done, the system sounds the horns as theft deterrent horn
and flashes the headlights and taillights for about one minute to alert. At the same time, the system discon-
nects the starter motor circuit and locks all doors (if all doors are not locked, the system repeats door locking
operation every 2 seconds during the one minute alert time).
(a) Open the engine hood using the engine hood opener lever.
(b) Unlock any of the front or rear doors without key operation.
5. CANCELING OF THE THEFT DETERRENT SYSTEM IN OPERATING CONDITION.
The theft deterrent operation can be cancelled when any of the following conditions is met:
No.ConditionCancelling Operation
1Unlock left or right door with the key.
2Unlock doors with wireless door lock control system.
3Insert key into ignition key cylinder and turn it to the ACC or ON position.*2
4About 1 minute passes after theft deterrent operation begins.Automatic stop*1
*1: In this case, the theft deterrent system resets in about 2 seconds if all doors are closed.
*
2: The alarm will be off, but the engine will not operate. To restart the engine, see No.1
6. ECU TERMINAL VALUES MEASUREMENT USING
TOYOTA BRAKE-OUT-BOX AND TOYOTA HAND-
HElD TESTER
(a) Hook up the TOYOTA brake- out- box and TOYOTA
hand-held tester to the vehicle.
(b) Read the ECU input/output values by following the
prompts on the hand-held tester screen.
HINT:
TOYOTA hand-held tester has a ºSnapshotº function. This re-
cords the measured values and is effective in the diagnosis of
intermittent problems.
Please refer to the TOYOTA hand-held tester/TOYOTA break-
out-box operator's manual for further details.

I02540
START
Disconnect
SPLY (+)
DI-620
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
848 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
This troubleshooting is based on the premise that engine cranking occurs.
If the engine does not crank, proceed to the engine troubleshooting on page DI-3 or DI-141 (Vol. 1).
1 Check voltage between terminal SRLY of theft deterrent and door lock ECU con-
nector and body ground.
PREPARATION:
(a) Remove the instrument panel. (See page BO-50)
(b) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal SRLY of theft deterrent ECU
connector and body ground, when ignition switch is turned to
ST position.
OK:
Voltage: 10 - 14 V
OK Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between starter and theft deterrent and door lock ECU
(See page IN-28).

I02557
1
2
Disconnect
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-643
871 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check engine hood courtesy switch.
PREPARATION:
(a) Remove engine hood lock assembly.
(b) Disconnect engine hood courtesy switch connector.
CHECK:
Check continuity between terminals 1 and 2 when engine hood
lock is locked and unlocked.
OK:
Engine hood lockTerminal No. to continuity
Lock-
Unlock1 - 2
NG Replace engine hood courtesy switch.
OK
2 Check harness and connector between theft deterrent and door lock ECU and
switch, switch and body ground (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace theft deterrent and door
lock ECU (See page IN-28).

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.

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

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.

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

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