AUTOMATIC TRANSMISSION SYSTEM(for 2GR-FKS), Diagnostic DTC:P07757F

DTC Code DTC Name
P07757F Pressure Control Solenoid "B" Actuator Stuck Off

DESCRIPTION

Based on signals from the transmission revolution sensors (NT, SP2 and NC3), the actual gear is detected.

If the detected gear is different than the commanded gear, the ECM detects related mechanical problems in the shift solenoid valves, transmission valve body assembly and automatic transmission assembly.

Tech Tips

Actual gear when a problem occurs in shift solenoid valve SL2:
ECM commanded gear 1st 2nd 3rd 4th 5th 6th 7th 8th
Actual gear during SL2 stuck ON malfunction 5th 8th 7th 6th 5th 6th 7th 8th
Actual gear during SL2 stuck OFF malfunction 1st 2nd 3rd 4th N (1st)* N* N* N*

*: Neutral

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P07757F Pressure Control Solenoid "B" Actuator Stuck Off

All of the following conditions are met (2-trip detection logic):


  1. Engine coolant temperature is 40°C (104°F) or higher.

  2. ATF temperature is -10°C (14°F) or higher.

  3. The vehicle is driven with the shift lever in D.

  4. No malfunctions are detected in the shift solenoid valve SL1, SL2, SL3, SL4, SL5 and SR, transmission revolution sensors (NT, NC3 and SP2), oil pressure switch, engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle and CAN communication system.

  5. Either of the following conditions is met:


    1. Any of the following conditions are met 2 times:


      1. When gear shifts to 1st are requested by the ECM, actual gear changes to 5th gear.

      2. When gear shifts to 2nd are requested by the ECM, actual gear changes to 8th gear.

      3. When gear shifts to 4th are requested by the ECM, actual gear changes to 6th gear.

    2. When gear shifts to 5th, 6th, 7th or 8th are requested by the ECM, the engine speed overruns (neutral status) for 0.5 seconds or more.

    DTC Detection Condition 1, 2, 3, 4 and 5 (a):

  • Shift solenoid valve SL2

  • Transmission revolution sensor (NC3)

  • Transmission valve body assembly

  • Torque converter assembly

  • Automatic transmission assembly


    DTC Detection Condition 1, 2, 3, 4 and 5 (b):

  • Shift solenoid valve SL2

  • Shift solenoid valve SR

  • Transmission revolution sensor (NC3)

  • Shift solenoid valve SLT

  • Transmission valve body assembly

  • Torque converter assembly

  • Automatic transmission assembly

 Comes on DTC stored SAE Code: P0776
DTC Detection Condition Patterns:
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnostic Condition Engine coolant temperature is 40°C (104°F) or higher. ○ ○ ○ ○
ATF temperature is -10°C (14°F) or more. ○ ○ ○ ○
The vehicle is driven with the shift lever in D. ○ ○ ○ ○
No malfunctions are detected in the shift solenoid valve SL1, SL2, SL3, SL4, SL5 and SR, transmission revolution sensors (NT, NC3 and SP2), oil pressure switch, engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle and CAN communication system. ○ ○ ○ ○
Malfunction Condition When gear shifts to 1st are requested by the ECM, actual gear changes to 5th gear. ○ - - -
When gear shifts to 2nd are requested by the ECM, actual gear changes to 8th gear. - ○ - -
When gear shifts to 4th are requested by the ECM, actual gear changes to 6th gear. - - ○ -
When gear shifts to 5th are requested by the ECM, the engine speed overruns (neutral status). - - - ○
Duration 2 times 2 times 2 times 0.5 seconds or more
Detection Logic 2-trip detection logic 2-trip detection logic 2-trip detection logic 2-trip detection logic
DTC Detection Condition Patterns:
Vehicle Condition
Pattern 5 Pattern 6 Pattern 7
Diagnostic Condition Engine coolant temperature is 40°C (104°F) or higher. ○ ○ ○
ATF temperature is -10°C (14°F) or more. ○ ○ ○
The vehicle is driven with the shift lever in D. ○ ○ ○
No malfunctions are detected in the shift solenoid valve SL1, SL2, SL3, SL4, SL5 and SR, transmission revolution sensors (NT, NC3 and SP2), oil pressure switch, engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle and CAN communication system. ○ ○ ○
Malfunction Condition When gear shifts to 6th are requested by the ECM, the engine speed overruns (neutral status). ○ - -
When gear shifts to 7th are requested by the ECM, the engine speed overruns (neutral status). - ○ -
When gear shifts to 8th are requested by the ECM, the engine speed overruns (neutral status). - - ○
Duration 0.5 seconds or more 0.5 seconds or more 0.5 seconds or more
Detection Logic 2-trip detection logic 2-trip detection logic 2-trip detection logic

Tech Tips

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

MONITOR DESCRIPTION

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

CONFIRMATION DRIVING PATTERN

CAUTION:

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

Tech Tips

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.


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the engine switch off and wait for 2 minutes or more.

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Start the engine.

  7. Perform the D Position Shift Test inspection in Road Test.

    Click here

  8. Stop the vehicle.

  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

  10. Input the DTC: P07757F.

  11. Check the DTC judgment result.

    GTS 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

    Tech Tips


    • 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 Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P276512.

Click here

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Transmission / Trouble Codes.


      Powertrain > Transmission > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only DTCs P07707F, P07757F and P27137F are output A
      Only DTC P07757F is output B
      P07707F, P07757F, P27137F and other DTCs are output C

      Tech Tips

      If any DTCs other than P07707F, P07757F and P27137F are output, perform troubleshooting for those DTCs first.


    B

    INSPECT SHIFT SOLENOID VALVE SL2 Click here

    C

    GO TO DTC CHART Click here

    A

  2. CLEAR DTC AND PERFORM STALL SPEED TEST


    1. Clear the DTCs.

      Click here


      Powertrain > Transmission > Clear DTCs

      Tech Tips

      Write down the currently output DTCs before clearing them.

    2. Perform the stall speed test.

      Click here

      Result
      Result Proceed to
      Stall speed test can be performed A
      Stall speed test cannot be performed B

    B

    INSPECT SHIFT SOLENOID VALVE SLT Click here

    A

  3. CLEAR DTC AND PERFORM RUNNING TEST


    1. Clear the DTCs.

      Click here


      Powertrain > Transmission > Clear DTCs

      Tech Tips

      Write down the currently output DTCs before clearing them.

    2. Start the engine, drive the vehicle and perform the inspection.

      Result
      Result Proceed to

      • Gear cannot be shifted between 1st gear and 4th gear

      • Gear can only be shifted from 4th gear to 5th gear

      • Gear cannot be shifted between 5th gear and 8th gear*

      		 A

      • Gear can be shifted from 1st gear to 4th gear

      • For 5th gear and above, gear shifts to neutral

      		 B
      Conditions other than those listed above C

      Tech Tips

      *: If the gear is shifted to 5th gear or above, gear shifts will no longer be able to be performed. When performing the test again, first clear the DTCs.


    B

    GO TO STEP 12 Click here

    C

    CHECK TRANSMISSION REVOLUTION SENSOR TERMINAL (NC3 TERMINAL) Click here

    A

  4. INSPECT SHIFT SOLENOID VALVE SR


    1. B003W1KC02
      *1 Shift Solenoid Valve SR

      Remove the shift solenoid valve SR.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal of shift solenoid valve SR connector - Shift solenoid valve SR body 20°C (68°F) 11 to 15 Ω

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

      OK
      Valve moves and makes an operating sound.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SHIFT SOLENOID VALVE SR Click here

    OK

  5. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly.

      Click here

      OK
      There is no foreign matter on each valve and they operate smoothly.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    OK

  6. INSPECT TORQUE CONVERTER ASSEMBLY


    1. Check the torque converter assembly.

      Click here

      OK
      The torque converter assembly operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Click here

    NG

    REPLACE TORQUE CONVERTER ASSEMBLY Click here

  7. CHECK TRANSMISSION REVOLUTION SENSOR TERMINAL (NC3 TERMINAL)


    1. B003UDYC89
      *a

      Front view of wire harness connector

      (to Transmission Wire)

      Disconnect the F128 transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F128-12 (NC3O) - Body ground Always 99 to 101 Ω

    3. Turn the engine switch on (IG).

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      F128-11 (NC3B) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) Click here

    OK

  8. INSPECT TRANSMISSION WIRE (TRANSMISSION REVOLUTION SENSOR (NC3))


    1. B003UEZC04
      *a

      Front view of wire harness connector

      (to Transmission Revolution Sensor (NC3))
      *b

      Component without harness connected

      (Transmission Wire)

      Disconnect the transmission revolution sensor (NC3) connector.

      Click here

    2. Disconnect the F128 transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal 1 of the transmission revolution sensor (NC3) connector - 11 (NC3B) Always Below 1 Ω
      Terminal 2 of the transmission revolution sensor (NC3) connector - 12 (NC3O) Always Below 1 Ω
      Terminal 1 of the transmission revolution sensor (NC3) connector or 11 (NC3B) - Body ground Always 10 kΩ or higher
      Terminal 2 of the transmission revolution sensor (NC3) connector or 12 (NC3O) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TRANSMISSION REVOLUTION SENSOR (NC3) Click here

    NG

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

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


    1. Disconnect the F128 transmission wire connector.

    2. Disconnect the F103 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F128-11 (NC3B) - F103-78 (NC3B) Always Below 1 Ω
      F128-12 (NC3O) - F103-110 (NC3O) Always Below 1 Ω
      F128-11 (NC3B) or F103-78 (NC3B) - Body ground Always 10 kΩ or higher
      F128-12 (NC3O) or F103-110 (NC3O) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM A/T CODE REGISTRATION Click here

  11. INSPECT SHIFT SOLENOID VALVE SLT


    1. B003VU8C19
      *1 Shift Solenoid Valve SLT

      Remove the shift solenoid valve SLT.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal 1 of the shift solenoid valve SLT - terminal 2 20°C (68°F) 5.0 to 5.6 Ω

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

      OK
      Valve moves and makes an operating sound.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 5 Click here

    NG

    REPLACE SHIFT SOLENOID VALVE SLT Click here

  12. INSPECT SHIFT SOLENOID VALVE SL2


    1. B003VU8C18
      *1 Shift Solenoid Valve SL2

      Remove the shift solenoid valve SL2.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal 1 of the shift solenoid valve SL2 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω

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

      OK
      Valve moves and makes an operating sound.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 5 Click here

    NG

    REPLACE SHIFT SOLENOID VALVE SL2 Click here