1995 TOYOTA SUPRA brake light

The No.4 solenoid valve controls the hydraulic pressure acting on
the brakes and clutches of the planetary gear units when gears are
shifted and performs smooth gear shifting.
The ECM determines optimum operating pressure according to
the signals from the throttle position sensor, vehicle speed sensor
and O/D clutch speed sensor and controls the volume of current
flow to the solenoid valve.
The amount of electric current to the solenoid is controlled by the
(*) duty ratio of ECM output signals, causing momentary change
to the hydraulic pressure acting on the clutches during gear shift-
ing. When the duty ratio is high, the hydraulic pressure acting on
the clutches is now.
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B is the period of non±continuity, then
Diagnostic Trouble Code Detection ConditionDTC No.Trouble Area
46

No. 4 solenoid valve

Harness or connector between No.4
solenoid valve and ECM

ECMAll conditions below are detected for 1 sec. or
more. (2 trips detection logic)*
(a) ECM outputs duty signal to No.4 solenoid in
90% or higher duty ratio.
(b) Current to No.4 solenoid:
330 + 100 mA or less
(O/D OFF indicator light doesn't blink)

* See page AT2±58

Waveform between terminals SLN
and E1 when engine is idling.
Waveform between terminals SLN
and E1 during shift change.
Lock±up
operation
pressure
Current flow to
solenoid
Duty Ratio =
CIRCUIT DESCRIPTION

100 (%)
DTC 46 No.4 Solenoid Valve Circuit (For Accumulator Back
Pressure Modulation)
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±75

Stop Light Switch Circuit
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while driving in lock±up condition, when
brakes are suddenly applied.
When the brake pedal is operated, this switch sends a signal to the ECM. Then the ECM cancels operation
of the lock±up clutch while braking is in progress.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±103

Depressed
Released
Brake pedalVoltage
0 V
8 V
Check stop light signal.
1. Connect the voltmeter to the terminals TT and
E1 of the DLC2.
2. Turn ignition switch ON.
3. Fully depress the accelerator pedal until the
voltmeter indicates 8 V and hold it.
4. Depress and release the brake pedal and
check the voltage.
Proceed to next circuit inspection shown on
matrix chart (See page AT2±64).
Check operation of stop light.
Repair or replace harness or connector.
Check and replace ECM.
Check harness and connector between ECM and stop light switch (See page
IN±30).
Check and repair stop light circuit.
Check if the stop lights go on and off normally when the brake pedal is depressed and released.
INSPECTION PROCEDURE
AT2±104± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

LOCK±UP POINT
NORM Mode
 D position Throttle valve opening 5% Lock±up ON km/h (mph) Lock±up OFF km/h (mph)
 3rd Gear 60±66 (37±41) 50±56 (31±35)
 O/D Gear 53±59 (33±37) 50±56 (31±35)
MANU Mode
 D position Throttle valve opening 5% Lock±up ON km/h (mph) Lock±up OFF km/h (mph) 
2nd Gear (2 position) 
60±66 (37±41) 
57±63 (35±39) 
 3rd Gear (D position)
 
 60±66 (37±41)
 
 57±63 (35±39)
 O/D Gear (D position) 181±195 (112±121) 69±76 (43±47)
HINT:
(1) There is no lock±up in the L positions.
(2) In the following cases, the lock±up will be released regardless of the lock±up pattern.
wWhen the throttle valve is completely closed.
wWhen the brake light switch is ON.
(3) Shift up to 3rd will not occur when the engine coolant temp. is below 35°C (95°F) and the vehicle
speed is below 40 km/h (25 mph).
(4) Shift±up to O/D will not occur when the engine coolant temp. is below 60°C (140°F) and the vehicle
speed is below 60 km/h (37 mph).
(5) When the vehicle speed drops to 10 km/h (6 mph) or more below the cruise control set vehicle speed,
shift down from O/D to 3rd occurs.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONSAT2±117

PREPARATION
SST (SPECIAL SERVICE TOOLS)
09843±18020Diagnosis Check Wire
09808±14010Fuel Sender Gauge Tool Assy
09950±50010Puller C Set
RECOMMENDED TOOLS
09082±00050TOYOTA Electrical Tester Set


EQUIPMENT
 
 Voltmeter
 
 
 Ammeter 
 Ohmmeter 
 Test lead 
 Thermometer Engine oil level warning switch, Seat heater
 Syphon Brake fluid level warning switch
 Oil bath Engine oil level warning switch
 Bulb (3.4 W) Fuel sender gauge, Seat belt warning relay Bulb (21 W) Turn signal flasher relay Dry cell battery Fuel sender gauge 
 Heat light
 
 Seat heater
 Torque wrench 
 Masking tape Rear window defogger wire
 Tin foil Rear window defogger wire
SSM (SPECIAL SERVICE MATERIAL)
 

DuPont Paste No. 4817 or
equivalent
 

Rear window defogger
 
 
equivalent 
 
± BODY ELECTRICAL SYSTEMPREPARATIONBE±3

 Trouble Parts name (See page)
 
 Only one side light does not light 
 
1. Headlight Bulb
2. Wire Harness
 
 ºLo±Beamº does not light (ALL) 
 
1. Headlight Control Relay (BE±16)
2. Wire Harness
 
 
 
ºLo±Beamº does not light (ONE SIDE)
 
 
 
1. HEAD LH±LWR Fuse (BE±5)
2. HEAD RH±LWR Fuse (BE±5)
3. Headlight Bulb
4. Wire Harness
 
 
 
 
ºHi±Beamº does not light (ALL)
 
 
 
 
1. Headlight Dimmer Switch (BE±15)
2. Daytime Running Light Relay (BE±18)
3. Daytime Running Light No.2 and No.3 Relay (BE±19)
4. Wire Harness
 
 
 
 
ºHi±Beamº does not light (ONE SIDE)
 
 
 
 
1. HEAD LH±UPR Fuse (BE±5)
2. HEAD RH±UPR Fuse (BE±5)
3. Headlight Bulb
4. Wire Harness
 
 
 
 
ºFlashº does not light
 
 
 
 
1. Headlight Dimmer Switch (BE±15)
2. Daytime Running Light Relay (BE±18)
3. Daytime Running Light No.2 and No.3 Relay (BE±19)
4. Wire Harness
 
 
 
ºAuto Turn±off Systemº dose not operate
 
 
 
1. Integration Relay (BE±17)
2. GAUGE Fuse (BE±6)
3. Wire Harness
4. Door Courtesy Switch (driver's) (BE±28)
 
 
 
 
 
Headlight does not light with light control SW in HEAD.
 
 
 
 
 
1. Integration Relay (BE±17)
2. Light Control Switch (BE±15)
3. Daytime Running Light Relay (BE±18)
4. Daytime Running Light No.2 and No.3 Relay (BE±19)
5. Wire Harness
 
 Headlight does not go out with light control SW in OFF 
 
1. Headlight Control Relay (BE±16)
2. Wire Harness
 
 
 
 
Taillight does not light with light control SW in TAIL
 
 
 
 
1. Taillight Control Relay (BE±16)
2. Integration Relay (BE±17)
3. Light Control Switch (BE±15)
4. Wire Harness
 
 
 
Taillight does not go out with light control SW in OFFª
 
 
 
1. Taillight Control Relay (BE±16)
2. Integration Relay (BE±17)
3. Light Control Switch (BE±15)
4. Wire Harness
 
 
 
 
 
 
Headlight and Taillight do not light with engine running and
light control SW in OFF
 
 
 
 
 
 
1. GAUGE Fuse (BE±6)
2. Daytime Running Light Relay (BE±18)
3. Daytime Running Light No.2 and No.3 Relay (BE±19)
4. Wire Harness
5. Generator L Terminal
6. Parking Brake Switch (BE±52)
BE±12± BODY ELECTRICAL SYSTEMHEADLIGHT AND TAILLIGHT SYSTEM

DAYTIME RUNNING LIGHT MAIN RELAY
INSPECTION
INSPECT RELAY CIRCUIT
Disconnect the connector from relay and inspect the connec-
tor on wire harness side, as shown.
 
 Tester connection to
terminal number 
 Condition
 
 Specified condition
 
 5±Ground
 
 Headlight dimmer switch position Low
beam or high beam 
  No continuity
 5±Ground  Headlight dimmer switch position Flash Continuity 8±Ground Parking brake switch position OFF No continuity 8±Ground Parking brake switch position ON Continuity 
16±Ground
 
Headlight dimmer switch position Low beam
 
No continuity
 16±Ground Headlight dimmer switch position Flash or
High beam Continuity
 
 13±Ground
 
 Constant
 
 Continuity
 18±Ground Constant Continuity
 2±Ground Ignition switch position LOCK or ACC No voltage
 2±Ground Ignition switch position ON Battery positive voltage
 11±Ground Engine Stop No voltage
 11±Ground Engine Running Battery positive voltage
 15±Ground  
15±Ground
17 GroundConstantBattery positive voltage 17±Ground Constant Battery ositive voltage
If the circuit is as specified, trying replacing the relay with a
new one. If the circuit is not as specified, inspect the circuit
connected to other parts.
PARKING BRAKE SWITCH INSPECTION
See page BE±52 BE±18
± BODY ELECTRICAL SYSTEMHEADLIGHT AND TAILLIGHT SYSTEM

WARNING LIGHTS
 Trouble Parts name (See page)
 
 
 
 
 
Warning lights do not light up
(Except Discharge and Door Open)
 
 
 
 
 
1. Bulb
2. IGN Fuse (BE±6)
3. Ignition Switch (BE±8)
4. Meter Circuit Plate (BE±44)
5. Wire Harness
6. Generator
 
 
 
 
 
 
Brake Warning Light does not light up
 
 
 
 
 
 
1. Bulb
2. Brake Fluid Level Warning Switch (BE±52)
3. Parking Brake Switch (BE±52)
4. Bulb Check Relay
5. Meter Circuit Plate (BE±44)
6. Wire Harness
 
 
 
 
 
Seat Belt Warning Light does not light up
 
 
 
 
 
1. Bulb
2. Seat Belt Buckle Switch (BE±56)
3. Integration Relay (BE±55)
4. Meter Circuit Plate (BE±44)
5. Wire Harness
 
 
 
 
Engine Oil Level Warning Light does not light up
 
 
 
 
1. Bulb
2. Engine Oil Level Switch (BE±51)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
 
 
 
Low Oil Pressure Warning Light does not light up
 
 
 
1. Bulb
2. Low Oil Pressure Warning Switch (BE±51)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
 
 
 
 
 
 
 
Door Open Warning Light does not light up
 
 
 
 
 
 
 
1. Bulb
2. DOME Fuse (BE±5)
3. Door Courtesy Switch (BE±54)
4. Luggage Room Light Switch (BE±28)
5. Integration Relay
6. Meter Circuit Plate (BE±44)
7. Wire Harness
 
 
 
 
Master Warning Light does not light up
 
 
 
 
1. Bulb
2. Telltale Light (BE±48)
3. Meter Circuit Plate (BE±44)
4. Wire Harness
BE±42± BODY ELECTRICAL SYSTEMCOMBINATION METER