System Description

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The ECM uses the signals from the throttle position sensor, air-flow meter, transmission revolution sensor (NT), transmission revolution sensor (SP2) and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.

The ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect mechanical problems of the shift solenoid valve SLU, transmission valve body assembly and torque converter assembly.

Fig 1: Torque Converter Clutch Pressure Control Solenoid Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Spool Valve	*b	Sleeve
*c	Solenoid Coil	*d	Lock-up Operation Pressure
*e	Current	-	-

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P2756-7F	Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off	All of the following conditions are met (2-trip detection logic): Engine coolant temperature is 40°C (104°F) or higher. The vehicle is driven with the shift lever in D. No malfunctions are detected in shift solenoid valve S1, S2, S3, S4, SR, SL2 and SLU, transmission revolution sensors (NT and SP2), engine coolant temperature sensor, knock control sensor, electronic throttle, 1 - 2 shift valve, sequence valve. Either of the following condition is met: When the ECM commands lock-up ON, lock-up does not occur for 0.4 seconds or more. When the ECM commands lock-up OFF, lock-up remains ON for 2 seconds or more.	Shift solenoid valve SLU remains open or closed Transmission valve body assembly is blocked Torque converter assembly Automatic transmission with transfer assembly (clutch, brake, gear, etc.) Line pressure is too low	Comes on	DTC stored	SAE Code: P2757

DTC DETECTION CONDITION PATTERNS:

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnostic Condition	Engine coolant temperature is 40°C (104°F) or higher.	◦	◦
	The vehicle is driven with the shift lever in D.	◦	◦
	No malfunctions are detected in shift solenoid valve S1, S2, S3, S4, SR, SL2 and SLU, transmission revolution sensors (NT and SP2), engine coolant temperature sensor, knock control sensor, electronic throttle, 1 - 2 shift valve, sequence valve.	◦	◦
Malfunction Condition	When the ECM commands lock-up ON, lock-up does not occur.	◦	-
Malfunction Condition	When the ECM commands lock-up OFF, lock-up remains ON.	-	◦
Duration		0.4 seconds or more	2 seconds or more
Detection Logic		2-trip detection logic	2-trip detection logic

HINT:

This DTC is stored when any of the above detection patterns is met.