Toyota Tacoma (2015-2018) Service Manual: Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL) (P2769,P2770)

Toyota Tacoma (2015-2018) Service Manual / Ac60e Automatic Transmission / Transaxle / Automatic Transmission System(for 2tr-fe) / 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 ECM 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	ECM 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 ECM
P2770	ECM 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 ECM

Fail-safe function:

If the ECM 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 ECM 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 ECM. The valve controls the lock-up relay valve to perform the torque-converter lock-up function. If the ECM detects an open or short in the shift solenoid valve SL circuit, it will illuminate the MIL and store the DTC.

MONITOR STRATEGY

Related DTCs	P2769: Shift solenoid valve SL/Range check P2770: Shift solenoid valve SL/Range check
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

All:

The monitor will run whenever the following DTCs are not stored	None
Battery voltage	8 V or higher
Ignition switch	ON
Starter	OFF
Command to shift solenoid valve SL	ON

P2769:

Time after command to solenoid OFF to ON

0.008 sec. or more

P2770:

Time after command to solenoid ON to OFF

0.008 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

P2769:

Solenoid terminal voltage level

Low

P2770:

Solenoid terminal voltage level

High

COMPONENT OPERATING RANGE

Solenoid terminal voltage level (Command to solenoid ON)	High
Solenoid terminal voltage level (Command to solenoid OFF)	Low

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).
Perform registration and/or initialization when parts related to the automatic transmission are replaced (See page ).

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Perform the Lock-up Function in Road Test (See page ).*1
Turn the ignition switch off.
Perform step (*1) again.
Check for DTCs again (See page ).

PROCEDURE

1.	INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)

(a) Disconnect the E1 transmission wire connector.

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

Standard Resistance:

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

Text in Illustration

*a	Component without harness connected (Transmission Wire)

GO TO STEP 3

2.	CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E18-12 (SL) - Body ground	20°C (68°F)	11 to 15 Ω

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT SHIFT SOLENOID VALVE SL

(a) Remove shift solenoid valve SL (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Shift solenoid valve SL connector terminal - Shift solenoid valve SL body	20°C (68°F)	11 to 15 Ω

OK:

Measurement Condition	Specified Condition
Battery positive (+) → Shift solenoid valve SL connector Battery negative (-) → Shift solenoid valve SL body	Valve moves and makes an operating noise

Text in Illustration

*1	Shift Solenoid Valve SL

REPLACE TRANSMISSION WIRE

REPLACE SHIFT SOLENOID VALVE SL

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