Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM10000000196HO
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 - 08/2018]
Title: UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P28077F; Pressure Control Solenoid "G" Actuator Stuck Off; 2018 MY Sienna [11/2017 - 08/2018]

DTC

P28077F

Pressure Control Solenoid "G" 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 malfunction of the shift solenoid valves, transmission valve body assembly and automatic transaxle assembly (clutch, brake, gear, etc.).

Actual gear when shift solenoid valve SL4 (without fail-safe control) malfunction occurs:

ECM commanded gear

1st

2nd

3rd

4th

5th

6th

7th

8th
*: Neutral

Actual gear during SL4 stuck ON malfunction

4th

4th

3rd

4th

4th to 5th

6th

7th

6th

Actual gear during SL4 stuck OFF malfunction

1st

2nd

3rd

N*

5th

N*

7th

8th

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P28077F

Pressure Control Solenoid "G" Actuator Stuck Off

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

SL4 stuck ON malfunction:

  1. 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, SL6, SL, SLU and SLT, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, electronic throttle or CAN2)
  2. One of the following occurs:
    1. When the ECM commands the transaxle to shift to 1st, 2nd or 5th gear, the actual gear changes to 4th gear.
    2. When the ECM commands the transaxle to shift to 8th gear, the actual gear changes to 6th gear.
  3. Malfunction status continues for 0.8 seconds or more
  4. 2-trip detection logic

SL4 stuck OFF malfunction:

  1. 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, SL6, SL, SLU and SLT, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, electronic throttle or CAN2)
  2. When the ECM commands the transaxle to shift to 4th or 6th gear, the engine overruns (neutral status).
  3. Malfunction status continues for 0.5 seconds or more
  4. 2-trip detection logic
  • Shift solenoid valve SL
  • Shift solenoid valve SLT
  • Shift solenoid valve SLU
  • Shift solenoid valve SL1
  • Shift solenoid valve SL2
  • Shift solenoid valve SL3
  • Shift solenoid valve SL4
  • Shift solenoid valve SL5
  • Shift solenoid valve SL6
  • Transmission valve body assembly
  • Torque converter assembly
  • Automatic transaxle assembly (clutch, brake, gear, etc.)

Comes on

DTC stored

SAE Code:

P2808

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

P2808:

Shift solenoid valve SL4/OFF malfunction

Shift solenoid valve SL4/ON malfunction

Required sensors/Components

Shift solenoid valve SL4

Frequency of operation

Continuous

Duration

OFF malfunction (A) and (B): 0.5 sec.

OFF malfunction (C): -

ON malfunction (A), (B) and (C): 0.8 sec.

ON malfunction (D): -

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)

P0712, P0713 (ATF temperature sensor circuit (TFT sensor))

P0335, P0337, P0338 (Crankshaft Position Sensor circuit)

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

Not OFF or ON malfunction (P0746)

Shift solenoid valve SL2

Not OFF or ON malfunction (P0776)

Shift solenoid valve SL3

Not OFF or ON malfunction (P0796)

Shift solenoid valve SL4

Not OFF or ON malfunction (P2808)

Shift solenoid valve SL5

Not OFF or ON malfunction (P2817)

Shift solenoid valve SL6

Not OFF or ON malfunction (P08BB)

Shift solenoid valve SLT

Not OFF malfunction (P2714)

Shift solenoid valve SLU

Not ON malfunction (P2757)

Shift solenoid valve SL

Not ON malfunction (P0741)

All shift solenoids

Not being halted

Neutral command flag

Not met

OFF malfunction (A)

ECM selected gear

6th

Neutral state detected when 4th gear commanded

-

Vehicle stop check

Fixed

OFF malfunction (B)

ECM selected gear

4th

Neutral state detected when 6th gear commanded

-

Vehicle stop check

Fixed

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

8th

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

Neutral state flag:

Turbine speed - output speed x (ECM selected gear)

1000 rpm or more

Neutral state detection:

Neutral state flag

ON
  • Any of the following conditions are met: Condition (a) or (b)

    • Condition (a)

      ECM selected gear

      4th

      Turbine speed - output speed x 3rd gear ratio

      More than 50 rpm

      Output speed x 5th gear ratio

      Less than 6500 rpm

      Condition (b)

      ECM selected gear

      6th

      Turbine speed - output speed x 4th gear ratio

      More than 50 rpm

      Output speed x 5th gear ratio

      Less than 6500 rpm

Vehicle stop check:

Vehicle speed

0 km/h (0 mph) or less

Neutral command flag:

Engine speed

7200 rpm or more

Turbine speed

7200 rpm or more
  • Any of the following conditions are met: Condition (a) or (b)

    • Condition (a)

      ECM selected gear

      6th or 7th or 8th

      Output speed x 5th gear ratio

      7200 rpm or more

      Condition (b)

      ECM selected gear

      4th or 5th

      Output speed x 3rd gear ratio

      7200 rpm or more

TYPICAL MALFUNCTION THRESHOLDS

OFF malfunction

  • Any of the following conditions are met: OFF malfunction (A), (B) or (C)

    OFF malfunction (A) and (B)

    Neutral state flag

    ON

    OFF malfunction (C)

    Shift solenoid valve SLT

    ON malfunction
    • Any of the following conditions are met: Condition (a) or (b)

      Condition (a)

      ECM selected gear

      4th

      4th gear pass detection

      Not fixed after transition to latest gear

      Condition (b)

      ECM selected gear

      6th

      6th gear pass detection

      Not fixed after transition to latest gear

ON malfunction

  • Any of the following conditions are met: ON malfunction (A), (B), (C) or (D)

    ON malfunction (A) and (B)

    Any of the following conditions are met

    (a) or (b)

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

    1.401 or more and 1.581 or less

    (When output speed less than 350 rpm)

    (b) Turbine speed - Output speed x 4th gear ratio

    -50 rpm or more and 50 rpm or less

    (When output speed 350 rpm or more)

    ON malfunction (C)

    Any of the following conditions are met

    (a) or (b)

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

    0.934 or more and 1.065 or less

    (When output speed less than 750 rpm)

    (b) Turbine speed - Output speed x 6th gear ratio

    -50 rpm or more and 50 rpm or less

    (When output speed 750 rpm or more)

    ON malfunction (D)

    Shift solenoid valve SLT

    ON malfunction
    • Any of the following conditions are met: Condition (a) or (b)

      Condition (a)

      ECM selected gear

      5th

      5th gear pass detection

      Not fixed after transition to latest gear

      Condition (b)

      ECM selected gear

      8th

      8th gear pass detection

      Not fixed after transition to latest gear

Neutral state flag:

Turbine speed - output speed x (ECM selected gear)

1000 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 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: DTC CHECK / CLEAR

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

    Click here 2018 - 2020 MY Sienna [11/2017 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: ROAD TEST

    HINT:

    [*1] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Stop the vehicle.
  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  10. Input the DTC: P28077F.
  11. 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 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  • Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

    Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: PRECAUTION

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P28077F)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Read the DTCs using the Techstream.

Result

Proceed to

DTC P28077F and P07457F, P07407E, P07757F, P07957F, P08BA7F, P27137F and/or P28167F are output

A

Only DTC P28077F 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.
B

GO TO STEP 3

C

GO TO DTC CHART

A

2.

CLEAR DTC AND PERFORM STALL SPEED TEST

(a) Clear the DTCs.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: DTC CHECK / CLEAR

HINT:

Write down the currently output DTCs before clearing them.

(b) Perform the stall speed test.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: MECHANICAL SYSTEM TESTS

Test Condition

Proceed to

Stall speed test can be performed

A

Stall speed test cannot be performed

B
B

GO TO STEP 5

A

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 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): VALVE BODY ASSEMBLY: DISASSEMBLY

*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.

NG

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

OK

4.

INSPECT SHIFT SOLENOID VALVE SL

(a) Remove the shift solenoid valve SL.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): VALVE BODY ASSEMBLY: DISASSEMBLY

*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.

NG

REPLACE SHIFT SOLENOID VALVE SL

OK

5.

INSPECT SHIFT SOLENOID VALVE SLT

(a) Remove the shift solenoid valve SLT.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): VALVE BODY ASSEMBLY: DISASSEMBLY

*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

(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.

NG

REPLACE SHIFT SOLENOID VALVE SLT

OK

6.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

(a) Inspect the transmission valve body assembly.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): VALVE BODY ASSEMBLY: REMOVAL

OK:

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

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

7.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Inspect the torque converter assembly.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): TORQUE CONVERTER AND DRIVE PLATE: INSPECTION

OK:

The torque converter assembly is normal.

NG

REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY

OK

8.

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY

(a) Repair or replace the automatic transaxle assembly.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE ASSEMBLY: COMPONENTS

NEXT

PERFORM A/T CODE REGISTRATION