UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P07757F; Pressure Control Solenoid "B" Actuator Stuck Off; 2017 MY Sienna [08/2016

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM10000000101M0
Model Year Start: 2017	Model: Sienna	Prod Date Range: [08/2016 - 11/2017]
Title: UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P07757F; Pressure Control Solenoid "B" Actuator Stuck Off; 2017 MY Sienna [08/2016 - 11/2017]

DTC

P07757F

Pressure Control Solenoid "B" Actuator Stuck Off

DESCRIPTION

Based on signals from the transmission revolution sensors (NT and NC), the actual gear is detected.

The ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical malfunctions of the shift solenoid valves, transmission valve body assembly and automatic transaxle assembly (clutch, brake, gear, etc.).

Actual gear when shift solenoid valve SL2 (without fail-safe control) malfunction occurs:

ECM commanded gear	1st	2nd	3rd	4th	5th	6th	7th	8th
*: Neutral
Actual gear during SL2 stuck ON malfunction	5th	5th	3rd to 5th	4th to 5th	5th	6th	7th	8th
Actual gear during SL2 stuck OFF malfunction	1st	2nd	3rd	4th	N*	N*	N*	N*

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P07757F

Pressure Control Solenoid "B" Actuator Stuck Off

1. Diagnosis Condition, 2. Malfunction Status, 3. Malfunction Time, 4. Other

SL2 stuck ON malfunction:

Engine coolant temperature is 40°C (104°F) or higher, ATF temperature is -10°C (14°F) or higher, and the vehicle is being driven with the shift lever in D (no malfunctions are detected in the shift solenoid valves SL1, SL2, SL3, SL4, SL5 and SL6, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, electronic throttle or CAN2)
When the ECM commands the transaxle to shift to 1st, 2nd, 3rd or 4th gear, the actual gear changes to 5th gear.
Malfunction status continues for 0.8 seconds or more
2-trip detection logic

SL2 stuck OFF malfunction:

Engine coolant temperature is 40°C (104°F) or higher, ATF temperature is -10°C (14°F) or higher, and the vehicle is being driven with the shift lever in D (no malfunctions are detected in the shift solenoid valves SL1, SL2, SL3, SL4, SL5 and SL6, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, electronic throttle or CAN2)
When the ECM commands the transaxle to shift to 5th, 6th, 7th or 8th gear, the engine overruns (neutral status).
Malfunction status continues for 0.5 seconds or more
2-trip detection logic

Shift solenoid valve SL1
Shift solenoid valve SL2
Shift solenoid valve SL3
Shift solenoid valve SL4
Shift solenoid valve SL5
Shift solenoid valve SL6
Shift solenoid valve SLT
Shift solenoid valve SL
Transmission valve body assembly
Torque converter assembly
Automatic transaxle assembly (clutch, brake, gear, etc.)

Comes on

DTC stored

SAE Code:

P0776

MONITOR DESCRIPTION

The ECM commands gear shifts by turning the shift solenoid valves on and off. According to the input shaft revolution (speed) and output shaft revolution (speed), the ECM detects the actual gear (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear). When the gear commanded by the ECM and the actual gear are not the same, the ECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	P0776: Shift solenoid valve SL2/OFF malfunction Shift solenoid valve SL2/ON malfunction
Required sensors/Components	Shift solenoid valve SL2
Frequency of operation	Continuous
Duration	OFF malfunction: 0.5 sec. ON malfunction: 0.8 sec.
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever this DTC is not present. (Not circuit malfunction)	P0717, P07BF, P07C0 (Turbine speed sensor circuit) P0793, P07C5, P07C6 (Intermediate shaft speed sensor circuit) P0962, P0963 (Shift solenoid valve SL1 circuit) P0966, P0967 (Shift solenoid valve SL2 circuit) P0970, P0971 (Shift solenoid valve SL3 circuit) P2814, P2815 (Shift solenoid valve SL4 circuit) P281D, P281E (Shift solenoid valve SL5 circuit) P08C1, P08C2 (Shift solenoid valve SL6 circuit) P2769, P2770 (Shift solenoid valve SL circuit) P2764, P2763 (Shift solenoid valve SLU circuit) P2720, P2721 (Shift solenoid valve SLT circuit) P0117, P0118 (ECT sensor circuit) P0335, P0337, P0338 (Crankshaft Position Sensor circuit) P0712, P0713 (ATF temperature sensor circuit (TFT sensor)) P0327, P0328, P0332, P0333 (KCS sensor circuit) P0121, P0122, P0123, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P061E, P0657, P0658, P2102, P2103, P2111, P2112, P2119, P2135 ((ETCS) Electronic throttle control system) U0100 (CAN communication system)
NSW switch	"D" and "not R" and "not N"
Duration time from shifting "N" to "D"	4 sec. or more
ATF temperature	-10°C (14°F) or more
Engine	Starting
Fail-safe does not active due to following malfunctions:	-
Shift solenoid valve SL1	OFF or ON malfunction (P0746)
Shift solenoid valve SL2	OFF or ON malfunction (P0776)
Shift solenoid valve SL3	OFF or ON malfunction (P0796)
Shift solenoid valve SL4	OFF or ON malfunction (P2808)
Shift solenoid valve SL5	OFF or ON malfunction (P2817)
Shift solenoid valve SL6	OFF or ON malfunction (P08BB)
Shift solenoid valve SLT	OFF malfunction (P2714)
Shift solenoid valve SLU	ON malfunction (P2757)
Shift solenoid valve SL	ON malfunction (P0741)
All shift solenoids	Not being halted
Neutral command flag	Not met

OFF malfunction (A)

ECM selected gear	4th
Turbine speed - Output speed x (4th gear ratio)	Less than 50 rpm

OFF malfunction (B)

ECM selected gear	5th
Following conditions met	a. b. or c.
a. First neutral state detection is fixed in 6th gear	-
b. First neutral state detection is fixed in 7th gear	-
c. First neutral state detection is fixed in 8th gear	-
Calculated load value	-
When A/C off	16% or more
When A/C on	19% or more
Throttle valve opening angle	3% or more

OFF malfunction (C)

ECM selected gear	5th, 6th, 7th or 8th
Following conditions met	a. b. c. or d.
a. ECM selected gear	5th
Turbine speed - Output speed x 3rd gear ratio (Output speed x 4th gear ratio)	More than 50 rpm and less than 6500 rpm
b. ECM selected gear	6th
Turbine speed - Output speed x 4th gear ratio (Output speed x 5th gear ratio)	More than 50 rpm and less than 6500 rpm
c. ECM selected gear	7th
Turbine speed - Output speed x 3rd gear ratio (Output speed x 5th gear ratio)	More than 50 rpm and less than 6500 rpm
d. ECM selected gear	8th
Turbine speed - Output speed x 5th gear ratio (Output speed x 5th gear ratio)	More than 50 rpm and less than 6500

ON malfunction (A)

ECM selected gear	1st
Vehicle speed	2 km/h (1.2 mph) or more and less than 38 km/h (23.6 mph)
Throttle valve opening angle	5% or more at engine speed 2000 rpm (conditions vary with engine speed)
Calculated load value	-
When A/C off	16% or more
When A/C on	19% or more
ECT	40°C (104°F) or more
Spark advance from MAX. retard timing by KCS control	0 °CA or more

ON malfunction (B)

ECM selected gear	2nd
Vehicle speed	2 km/h (1.2 mph) or more
Throttle valve opening angle	5% or more at engine speed 2000 rpm (conditions vary with engine speed)
Calculated load value	-
When A/C off	16% or more
When A/C on	19% or more
ECT	40°C (104°F) or more
Spark advance from MAX. retard timing by KCS control	0 °CA or more

ON malfunction (C)

ECM selected gear	3rd
Vehicle speed	2 km/h (1.2 mph) or more
Throttle valve opening angle	5% or more at engine speed 2000 rpm (conditions vary with engine speed)
Calculated load value	-
When A/C off	16% or more
When A/C on	19% or more
ECT	40°C (104°F) or more
Spark advance from MAX. retard timing by KCS control	0 °CA or more

ON malfunction (D)

ECM selected gear	4th
Vehicle speed	2 km/h (1.2 mph) or more
Throttle valve opening angle	5% or more at engine speed 2000 rpm (conditions vary with engine speed)
Calculated load value	-
When A/C off	16% or more
When A/C on	19% or more
ECT	40°C (104°F) or more
Spark advance from MAX. retard timing by KCS control	0 °CA or more

ON malfunction (E)

Turbine speed	7000 rpm or more
Following conditions met	a. or b.
a. ECM selected gear	6th, 7th or 8th
Output speed x 5th gear ratio	7000 rpm or more
b. ECM selected gear	4th or 5th
Output speed x 3rd gear ratio	7000 rpm or more

TYPICAL MALFUNCTION THRESHOLDS

OFF malfunction

OFF malfunction (A)

Turbine speed - Output speed x (ECM selected gear)

1000 rpm or more

OFF malfunction (B)

Shift solenoid valve SLT

ON malfunction

When one of the following conditions is met: ON malfunction (A), (B), (C) or (D)

ON malfunction (A)

When either condition below is met: (a) or (b)

(a) Turbine speed/Output speed (NT/NO)

4.682 or more and 9.515 or less

(When Output speed less than 50 rpm)

(b) Turbine speed - Output speed x 5th gear ratio

-50 rpm or more and 50 rpm or less

(When Output speed less than 50 rpm)

ON malfunction (B)

When either condition below is met: (a) or (b)

(a) Turbine speed/Output speed (NT/NO)

2.9 or more and 3.467 or less

(When Output speed less than 180 rpm)

(b) Turbine speed - Output speed x 5th gear ratio

-50 rpm or more and 50 rpm or less

(When Output speed 180 rpm or more)

ON malfunction (C)

When either condition below is met: (a) or (b)

(a) Turbine speed/Output speed (NT/NO)

1.91 or more and 2.189 or less

(When Output speed less than 350 rpm)

(b) Turbine speed - Output speed x 5th gear ratio

-50 rpm or more and 50 rpm or less

(When Output speed 350 rpm or more)

ON malfunction (D)

When either condition below is met: (a) or (b)

(a) Turbine speed/Output speed (NT/NO)

1.41 or more and 1.581 or less

(When Output speed less than 350 rpm)

(b) Turbine speed - Output speed x 7th gear ratio

-50 rpm or more and 50 rpm or less

(When Output speed 350 rpm or more)

ON malfunction (E)

Engine speed

7000 rpm or more

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
Click here

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine.
Perform the D Position Shift Test inspection in Road Test. [*1]
Click here

HINT:

[*1] : Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P07757F.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs.
Click here
Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
Click here

PROCEDURE

1.	CHECK DTC OUTPUT (IN ADDITION TO DTC P07757F)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.

(e) Read the DTCs using the Techstream.

Result	Proceed to
DTC P07757F and DTC P07407E, P07457F, P07957F, P08BA7F, P27137F, P28077F and/or P28167F are output	A
Only DTC P07757F is output	B
DTCs other than P07457F, P07407E, P07757F, P07957F, P08BA7F, P27137F, P28077F and P28167F are also output	C

HINT:

If any DTCs other than P07457F, P07407E, P07757F, P07957F, P08BA7F, P27137F, P28077F and P28167F are output, perform troubleshooting for those DTCs first.
If a shift solenoid valve is stuck ON or OFF, DTCs for several shift solenoid valves including the malfunctioning shift solenoid valve will be stored.

GO TO STEP 3

GO TO DTC CHART

2.	CLEAR DTC AND PERFORM STALL SPEED TEST

(a) Clear the DTCs.

Click here

HINT:

Write down the currently output DTCs before clearing them.

(b) Perform the stall speed test.

Click here

Test Condition	Proceed to
Stall speed test can be performed	A
Stall speed test cannot be performed	B

GO TO STEP 5

3.	INSPECT SHIFT SOLENOID VALVE SL1, SL2, SL3, SL4, SL5 AND SL6

(a) Remove the shift solenoid valves SL1, SL2, SL3, SL4 SL5 and SL6.

Click here

*a	Component without harness connected (Shift Solenoid Valve SL1, SL2, SL3, SL4 SL5 and SL6)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Shift solenoid valve SL1 connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Shift solenoid valve SL2 connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Shift solenoid valve SL3 connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Shift solenoid valve SL4 connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Shift solenoid valve SL5 connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Shift solenoid valve SL6 connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω

(c) Connect a positive (+) lead from the battery to terminal 1 and a negative (-) lead with a 21 W bulb to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

REPLACE SHIFT SOLENOID VALVE SL1, SL2, SL3, SL4 SL5 OR SL6

4.	INSPECT SHIFT SOLENOID VALVE SL

(a) Remove the shift solenoid valve SL.

Click here

*1	Shift Solenoid Valve SL

(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

(c) Connect a positive (+) lead from the battery to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

REPLACE SHIFT SOLENOID VALVE SL

5.	INSPECT SHIFT SOLENOID VALVE SLT

(a) Remove the shift solenoid valve SLT.

Click here

*a	Component without harness connected (Shift Solenoid Valve SLT)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Shift solenoid valve SLT connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω

OK:

Valve moves and makes an operating sound.

REPLACE SHIFT SOLENOID VALVE SLT

6.	INSPECT TRANSMISSION VALVE BODY ASSEMBLY

(a) Inspect the transmission valve body assembly.

Click here

OK:

There is no foreign matter on each valve and they operate smoothly.

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

7.	INSPECT TORQUE CONVERTER ASSEMBLY

(a) Inspect the torque converter assembly.

Click here

OK:

The torque converter assembly is normal.

REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY

8.	REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY

(a) Repair or replace the automatic transaxle assembly.

Click here

PERFORM A/T CODE REGISTRATION