display TOYOTA SUPRA 1995 Service Owner's Manual

O D Main Switch & O D OFF Indicator Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch contacts go off when the switch is pushed in and comes on when it is pushed out.
In O/D main switch OFF position the O/D OFF indicator lights up, and the ECM prohibits shifting to over-
drive. The ECM also causes the O/D OFF indicator light to blink when a malfunction is detected. In this
case, connecting the terminals in the DLC2 or DLC1 can display the malfunction code.
(*) O/D Main Switch
Contacts go off with button pushed in.
Contacts go on with button pushed out. AT2±108
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

TE1 Terminal Circuit
CIRCUIT DESCRIPTION
ECM displays diagnostic trouble codes using the O/D OFF indicator light when terminals TE1 and E1 of
the DLC2 or DLC1 are connected.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±113

ANTI±THEFT SYSTEM
HINT: The words ºANTI±THEFT SYSTEMº are displayed on
the cassette tape slot cover.
For operation instructions for the anti±theft system, please
consult the audio system section in the Owner's Manual
(hereafter called O/M).
1. SETTING SYSTEM
The system is in operation once the customer has pushed the
required buttons and entered the customer±selected 3±digit
ID number.
(Refer to the O/M section, ºSetting the anti±theft systemº)
HINT:
w When the audio system is shipped the ID number has
not been input, so the anti±theft system is not in
operation.
w If the ID number has not been input, the audio system
remains the same as a normal audio system.
2. ANTI±THEFT SYSTEM OPERATION
If the normal electrical power source (connector or battery
terminal) is cut off, the audio system becomes inoperable,
even if the power supply resumes.
3. CANCELING SYSTEM
The ID number chosen by the customer is input to cancel the
anti±theft system.
(Refer to the O/M section, ºIf the system is activatedº)
HINT: To change or cancel the ID number, please refer to the
O/M section ºCancelling the systemº. BE±84
± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Display E:
ANTI±THEFT SYSTEM
operation condition.
(ID number input error
10 times or more.)Display A:
ID Number is set.Display B
Anti±theft
SystemTROUBLESHOOTING FOR ANTI±THEFT SYSTEM
Turn Ignition key from Lock position to ACC position.
Cancel ID number, refer to each malfunction item.
Take to designated radio
service station.
[ISEC] Display Disappears
After 1 Second.
Normal operation
Refer to each
malfunction item.
(Liquid Crystal Display (LCD) for Audio System)
Cancel ID number, refer to each malfunction item.
ANTI±THEFT SYSTEM operation condition.
[ID number input error 9 times or less.]
Input ID number to cancel ANTI±THEFT SYSTEM, and check display.
Radio switch ON.
ANTI±THEFT SYSTEM not
cancelled.
(ID number input error 9
times or less.)
ANTI±THEFT SYSTEM cancelled.
Check audio system again.
Radio Display
Display BDisplay D
Radio switch ON.
Display EDisplay C"ADisplay BDisplay A " B
Display D
Radio switch ON.Take to designated radio
service station.Refer to each
malfunction item.
Normal
operation
Normal operation.
ID number
input error
time
Blank,
No Illumination
Display B
Display E
Display DDisplay ADisplay C
HINT:
a) Refer to O/M for operation details of ANTI±THEFT SYSTEM.
b) When the ID number has been cancelled, reset the same number after completing the operation,
or inform the customer that it has been cancelled.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±111

DIAGNOSIS SYSTEM
INDICATOR CHECK
1. Turn the ignition switch to ON.
2. Check that the CRUISE MAIN indicator light comes on when
the cruise control main switch is turned ON, and that the
indicator light goes off when the main switch is turned OFF.
HINT: If the indicator check result is not normal, proceed to
troubleshooting (See page BE±43 for the combination meter
section.)
DIAGNOSTIC TROUBLE CODE CHECK
HINT: If a malfunction occurs in the vehicle speed sensors or
actuator, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and blinks the CRUISE
MAIN indicator light to inform the driver of a malfunction. At
the same time, the malfunction is stored in memory as a diag-
nostic trouble code.
OUTPUT OF DIAGNOSTIC TROUBLE CODE
Using diagnosis check wire:
1. Turn the ignition switch ON.
2. Using SST, connect terminals Tc and E
1 of DLC2.
SST 09843±18020
3. Read the diagnostic trouble code on the CRUISE MAIN
indicator light.
HINT: If the diagnostic trouble code is not output, inspect the
diagnosis circuit (See page BE±199).
As an example, the blinking patterns for codes; normal, 11
and 21 are shown in the illustration.
4. Check for the problem using the diagnostic trouble code table
on the next page.
5. After completing the check, disconnect terminals Tc and E
1,
and turn off the display.
± BODY ELECTRICAL SYSTEMBE±165CRUISE CONTROL SYSTEM

DIAGNOSTIC TROUBLE CODE
Source voltage drop.
Duty ratio of 100% output to motor
acceleration side.
Voltage abnormality in control switch.
Short in control switch circuit.
Vehicle Speed Sensor Pulse is abnormal.
Actual vehicle speed has dropped by 16 km/h
(10 mph) or more below the set speed.
Speed signal is not input to the ECU while cruise control is set.
Open in actuator motor circuit.
Position sensor detects abnormal voltage.
Position sensor signal value does not change when themotor operates.
Open in magnet clutch circuit for 0.8 sec.
Overcurrent (short) in magnet clutch circuit.
Overcurrent (short) in motor circuit.
Normal
DiagnosisLight Blinking Pattern
CRUISE MAIN IndicatorDTC
HINT: When 2 or more codes are indicated, the lowest numbered code will be displayed first.
(*) When the vehicle speed is reduced on uphill roads, the speed can be set again and driving continued.
(This is not a malfunction.)
± BODY ELECTRICAL SYSTEMBE±167CRUISE CONTROL SYSTEM

Diagnostic Trouble Code Clearance
1. After completing repairs the diagnostic trouble code retained
in memory can be cleared by removing the ECU±B fuse for
10 seconds or more, with the ignition switch off.
2. Check that the normal code is displayed after connecting the
fuse.
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the diagnostic trouble code check, check the circuit listed for that code
in the table below and proceed to the appropriate page.
 
 Code No.
 
 Circuit Inspection
 
 Page
 
 11, 14
 
  Actuator Motor Circuit.
 
 BE±171
 
 12
 
  Actuator Magnet Clutch Circuit.
 
 BE±172
 
 
 
13
 
 
 
 Actuator Motor Circuit
 Actuator Position Sensor Circuit
 
 
 
BE±171
BE±175
 
 
 
14
 
 
 
 Actuator Motor Circuit
 Actuator Position Sensor Circuit
 
 
 
BE±171
BE±175
 
 21
 
  Speed Sensor Circuit
 
 BE±177
 
 23
 
  Speed Sensor Circuit
 
 BE±177
 
 32, 34 
  Control Switch Circuit. (Cruise Control Switch) 
 BE±197
HINT:
1. If the instruction 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.
2. If the trouble still reappears even though there are no abnormalities in any of the other circuits, then check
or replace the cruise control ECU as the last step. BE±168
± BODY ELECTRICAL SYSTEM
CRUISE CONTROL SYSTEM

INPUT SIGNAL CHECK
Output Code
1. (a) For check No.1 No.3
Turn the ignition switch on.
(b) For check No.4
Jack up the vehicle.
Start the engine.
2. Turn the control switch to SET/COAST position or RES/ACC
position and hold it down or up (1).
3. Push the main switch on (2).
4. Check that the CRUISE MAIN indicator light blinks twice or
3 times repeatedly.
5. Turn the SET/COAST switch or RES/ACC position off.
6. Operate each switch as listed in the table below.
7. Read the blinking pattern of the CRUISE MAIN indicator light.
8. After performing the check, turn the main switch off.
HINT: When two or more signals are input to the ECU, only
the lowest±numbered code is displayed.
Turn SET/COAST switch ON.
Turn RES/ACC switch ON.
Turn CANCEL switch ON.
Turn stop light switch ON.
(Depress brake pedal)
Turn parking brake switch ON.
(Pull up the parking brake lever).
Turn neutral start switch OFF.
(Shift to EXCEPT D RANGE).
Turn clutch switch OFF.
(Depress clutch pedal)
Drive at 40 km/h (25 mph) or
higher.
Drive at 40 km/h (25 mph) or
below.
SET/COAST switch circuit is
normal.
RES/ACC switch circuit is
normal.
CANCEL switch circuit is
normal.
Stop light switch circuit is
normal.
Parking brake switch circuit
is normal.
Neutral start switch circuit is
normal.
Clutch switch circuit is
normal.
Speed sensor is normal.
DiagnosisOperation MethodCRUISE MAIN Indicator Light
Blinking Pattern
± BODY ELECTRICAL SYSTEMBE±169CRUISE CONTROL SYSTEM

(1)Remove cruise control actuator.
(2)Disconnect actuator connector.
(1)Connect positive (+) lead to terminal 5 and
negative (±) lead to terminal 4 of actuator connector.
(Magnet clutch ON)
(2)When battery positive voltage is applied to each of
the actuator connector terminals check that the con-
trol plate moves smoothly without hesitating.
(3) With the motor rotating as in 2., check that the mo±
tor is stopped by limit switches when the control
plate moves to fully opened or fully closed position.
Replace actuator assembly.
Repair or replace harness or connector.
Check harness and connectors between cruise control ECU and actuator
motor (See page IN±30).
 
 Proceed to next circuit inspection shown on matrix chart (See page BE±170).
However, when diag. trouble code 11, 14, 41 is displayed, check and replace cruise control ECU.
BE±172± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM

(See page IN±30)
(1) Connect positive  lead to terminal 5 and negative
lead to terminal 4 of actuator connector.
(2) Move the control plate by hand.
Replace stop light switch.
Repair or replace harness or connector.
Check for open and short in harness and connectors between ECU and stop light switch,
stop light switch and magnet clutch, magnet clutch and body ground. (See page
IN±30).
(1) Remove cruise control actuator.
(2) Disconnect actuator connector.
Move the control plate by hand.
Control plate moves. (Magnet clutch off)
Control plate doesn't move. (Magnet clutch on)
Replace actuator assembly.
Disconnect stop light switch connector.
Check continuity between terminals.
Continuity
Terminals
Switch pin free
Switch position
(Brake pedal depressed)
Switch pin pushes in
(Brake pedal released)
Check actuator magnet clutch.
Check stop light switch.
INSPECTION PROCEDURE
 
 
Proceed to next circuit inspection shown on matrix chart (See page BE±170).
However, when diag. trouble code 12, is displayed, check harness and connector for loose
connection. If connection is normal, check and replace ECU.
BE±174± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM