Toyota Supra 2015 Wiring Diagram Manual page 134

AND A/T INDICATOR (2JZ-GTE)
SYSTEM OUTLINE
THIS SYSTEM ELECTRICALLY CONTROLS THE LINE PRESSURE, THROTTLE PRESSURE, LOCK-UP PRESSURE AND
ACCUMULATOR PRESSURE ETC. THROUGH THE SOLENOID VALVE.
TRANSMISSION IS A SYSTEM WHICH PRECISELY CONTROLS GEAR SHIFT TIMING AND LOCK-UP TIMING IN
RESPONSE TO THE VEHICLE'S DRIVING CONDITIONS AND THE ENGINE OPERATING CONDITIONS DETECTED BY
VARIOUS SENSORS, MAKING SMOOTH DRIVING POSSIBLE BY SHIFT SELECTION FOR EACH GEAR WHICH IS THE
MOST APPROPRIATE TO THE DRIVING CONDITIONS AT THAT TIME, AND CONTROLS THE ENGINE TORQUE DURING
SHIFTING TO ACHIEVE OPTIMUM SHIFT FEELING.
1. GEAR SHIFT OPERATION
WHEN DRIVING, THE ENGINE WARM UP CONDITION IS INPUT AS A SIGNAL TO TERMINAL (B) 44 OF THE ENGINE
CONTROL MODULE FROM THE ENGINE COOLANT TEMP. SENSOR AND THE VEHICLE SPEED SIGNAL FROM
VEHICLE SPEED SENSOR NO. 2 IS INPUT TO TERMINAL (B) 23 OF THE ENGINE CONTROL MODULE. AT THE SAME
TIME, THE THROTTLE VALVE OPENING SIGNAL FROM THE THROTTLE POSITION SENSOR (MAIN) IS INPUT TO
TERMINAL (B) 43 OF THE ENGINE CONTROL MODULE AS THROTTLE ANGLE SIGNAL.
BASED ON THESE SIGNALS, THE ENGINE CONTROL SELECTS THE BEST SHIFT POSITION FOR DRIVING
CONDITIONS AND SENDS CURRENT TO THE ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOIDS.
WHEN SHIFTING TO 1ST SPEED, THE CURRENT FLOWS FROM TERMINAL (B) 10 OF THE ENGINE CONTROL
MODULE → TERMINAL 4 OF ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID→GROUND AND
CONTINUITY TO NO. 1 SOLENOID CAUSES THE SHIFT (NO. 2 SOLENOID DOES NOT HAVE CONTINUITY AT THIS
TIME.)
FOR 2ND SPEED, THE CURRENT FLOWS SIMULTANEOUSLY FROM TERMINAL (B) 9 OF THE ENGINE CONTROL
MODULE → TERMINAL 8 OF ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID → GROUND AND FROM
TERMINAL (B) 10 OF THE ENGINE CONTROL MODULE → TERMINAL 4 OF ELECTRONICALLY CONTROLLED
TRANSMISSION SOLENOID → GROUND, AND CONTINUITY TO NO. 1 AND NO. 2 SOLENOIDS CAUSES THE SHIFT.
FOR 3RD SPEED, THERE IS NO CONTINUITY TO NO. 1 SOLENOID, ONLY TO NO. 2 SOLENOID, CAUSING THE SHIFT.
SHIFTING INTO THE 4TH SPEED (OVERDRIVE) OCCURS WHEN NO CURRENT FLOWS TO NO. 1 AND NO. 2
SOLENOIDS. THE NO. 4
ADJUST THE BACK PRESSURE ON THE ACCUMULATOR AND CONTROLS THE HYDRAULIC PRESSURE DURING
SHIFTING AND LOCK-UP IN ORDER TO PROVIDE SMOOTH SHIFTING WITH LITTLE SHIFT SHOCK.
2. LOCK-UP OPERATION
WHEN THE ENGINE CONTROL MODULE DECIDES BASED ON EACH SIGNAL THAT THE LOCK-UP CONDITION HAS
BEEN MET, THE CURRENT THROUGH EFI NO. 1 FUSE FLOWS FROM THE EFI MAIN RELAY → TERMINAL 3 OF
ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID → TERMINAL 7→ TERMINAL (B) 14 OF THE ENGINE
CONTROL MODULE → GROUND,SO CONTINUITY TO NO. 3 (FOR LOCK-UP) CAUSES LOCK-UP.
3. STOP LIGHT SW CIRCUIT
IF THE BRAKE PEDAL IS DEPRESSED (STOP LIGHT SW ON) WHEN DRIVING IN LOCK-UP CONDITION, A SIGNAL IS
INPUT TO TERMINAL(A) 4 OF THE ENGINE CONTROL MODULE. THE ENGINE CONTROL MODULE OPERATES AND
CUTS THE CURRENT TO THE SOLENOID.TO RELEASE LOCK-UP.
4. OVERDRIVE CIRCUIT
∗ O/D MAIN SW ON
WHEN THE O/D MAIN SW IS TURNED ON (SW POINT IS OPEN), A SIGNAL IS INPUT TO TERMINAL (A) 28 OF THE
ENGINE CONTROL MODULE, AND THE ELECTRONICALLY CONTROLLED TRANSMISSION CAUSES SHIFT TO
OVERDRIVE WHEN THE CONDITIONS FOR OVERDRIVE ARE MET.
∗ O/D MAIN SW OFF
WHEN THE O/D MAIN SW IS TURNED OFF (SW POINT IS CLOSED), THE CURRENT FLOWING THROUGH THE O/D
OFF INDICATOR LIGHT FLOWS TO GROUND BY WAY OF THE O/D MAIN SW AND CAUSES THE O/D OFF INDICATOR
LIGHT TO LIGHT UP. AT THE SAME TIME, A SIGNAL IS INPUT TO TERMINAL (A) 28 OF THE ENGINE CONTROL
MODULE AND THE ELECTRONICALLY CONTROLLED TRANSMISSION PREVENTS SHIFT INTO OVERDRIVE.
5. ELECTRONICALLY CONTROLLED TRANSMISSION PATTERN SELECT SW CIRCUIT
WHEN THE ELECTRONICALLY CONTROLLED TRANSMISSION PATTERN SELECT SW IS SWITCHED FROM NORMAL
TO MANUAL, A SIGNAL IS INPUT TO TERMINAL (A) 18 OF THE ENGINE CONTROL MODULE. INPUT OF THIS SIGNAL
CAUSES CURRENT TO FLOW FROM THE GAUGE FUSE TO TERMINAL (A) 1 OF THE COMBINATION METER →
TERMINAL (A) 12→ TERMINAL (A) 25 OF THE ENGINE CONTROL MODULE → GROUND, LIGHTING UP THE
INDICATOR LIGHT. IF THE A/T SHIFT LEVER IS THEN SHIFTED TO "2'' POSITION, THE ENGINE CONTROL MODULE
ENABLES THE VEHICLE TO START OFF WITH THE TRANSMISSION IS 2ND GEAR, THUS PERMITTING EASING
STARTING OFF AND DRIVING ON SLIPPERY ROADS.
6. CRUISE CONTROL
WHEN CRUISE CONTROL OPERATION IS SELECTED A SIGNAL IS INPUT TO TERMINAL (A) 12 OF THE ENGINE
CONTROL MODULE FROM CRUISE CONTREOL ECU. AS A RESULT, THE ENGINE CONTROL MODULE OPERATES
AND CONTROLS OVERDRIVE, LOCK-UP AND SO ON FOR SMOOTH DRIVING.
SOLENOID (FOR ACCUMULATOR BACK PRESSURE MODULATION) IS INSTALLED TO
THE ELECTRONICALLY CONTROLLED
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