Toyota Venza: Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL) (P2769,P2770)

Toyota Venza Service Manual / U660e Automatic Transmission / Transaxle / Automatic Transaxle System / Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL) (P2769,P2770)

DESCRIPTION

Shift solenoid valve SL is turned on and off by signals from the TCM to control the hydraulic pressure acting on the lock-up relay valve, which then controls operation of the lock-up clutch.

DTC No.	DTC Detection Condition	Trouble Area
P2769	TCM detects a short in the shift solenoid valve SL circuit when the shift solenoid valve SL is operated (2 trip detection logic).	Short in shift solenoid valve SL circuit Shift solenoid valve SL TCM
P2770	TCM detects an open in the shift solenoid valve SL circuit when the shift solenoid valve SL is not operated (2 trip detection logic).	Open in shift solenoid valve SL circuit Shift solenoid valve SL TCM

Fail-safe function:

If the TCM detects a malfunction, it turns shift solenoid valve SL off.

MONITOR DESCRIPTION

Based on the signals from the throttle position sensor, the air flow meter and the crankshaft position sensor, the TCM sends a signal to shift solenoid valve SL to regulate the hydraulic pressure and provide smoother torque converter engagement. Shift solenoid valve SL responds to commands from the TCM. The valve controls the lock-up relay valve to perform the torque-converter lock-up function. If the TCM detects an open or short circuit for shift solenoid valve SL, it will illuminate the MIL.

MONITOR STRATEGY

Related DTCs	P2769: Shift solenoid valve SL/Range check (Low resistance) P2770: Shift solenoid valve SL/Range check (High resistance)
Required sensors/Components	Shift solenoid valve SL
Frequency of operation	Continuous
Duration	1 time
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

P2769: Range check (Low resistance):

The monitor will run whenever the following DTCs are not present	None
Command to solenoid	ON
Time after command to solenoid OFF to ON	More than 0.008 sec.

P2770: Range check (High resistance):

The monitor will run whenever the following DTCs are not present	None
Command to solenoid	OFF
Time after command to solenoid ON to OFF	More than 0.008 sec.

TYPICAL MALFUNCTION THRESHOLDS

P2769: Range check (Low resistance):

Intelligent power MOS diagnosis fail signals detected while the solenoid is operated

Fail at solenoid resistance: 8 Ω or less

P2770: Range check (High resistance):

Intelligent power MOS diagnosis fail signals detected while the solenoid is not operated

Fail at solenoid resistance: 100 kΩ or more

COMPONENT OPERATING RANGE

Shift solenoid valve SL

Resistance: 11 to 15 Ω at 20°C (68°F)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

PROCEDURE

1.	INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)

(a) Remove the TCM from the transaxle.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
6 (SL) - Body ground	20°C (68°F)	11 to 15 Ω

REPLACE TCM

2.	INSPECT SHIFT SOLENOID VALVE SL

(a) Remove shift solenoid valve SL.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Solenoid Connector (SL) - Solenoid Body (SL)	20°C (68°F)	11 to 15 Ω

Text in Illustration

*1	Shift Solenoid Valve SL

REPLACE TRANSMISSION WIRE

REPLACE SHIFT SOLENOID VALVE SL

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