AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0776

DTC Code DTC Name
P0776 Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)

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 TCM detects related mechanical problems in the shift solenoid valves, valve body and automatic transmission.

Tech Tips

Actual gear when a problem occurs in shift solenoid valve SL2:

TCM 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
P0776 Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)

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

DTC Detection Condition 1:


  1. Engine coolant temperature is 40°C (104°F) or more, ATF temperature is -10°C (14°F) or more, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, transmission revolution sensors (NT, NC3, SP2), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)

  2. One of following occurs:

    (a) When gear shifts to 1st are requested by the TCM, actual gear changes to 5th gear

    (b) When gear shifts to 2nd are requested by the TCM, actual gear changes to 8th gear

    (c) When gear shifts to 4th are requested by the TCM, actual gear changes to 6th gear

  3. Malfunction status occurs 2 times per trip

  4. 2-trip detection logic

DTC Detection Condition 2:


  1. Engine coolant temperature is 40°C (104°F) or more, ATF temperature is -10°C (14°F) or more, and the vehicle is driven with shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, transmission revolution sensors (NT, NC3, SP2), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)

  2. When gear shifts to 5th to 8th are requested by the TCM, the engine speed overruns (neutral status)

  3. Malfunction status continues for 0.5 sec. or more (1 trip)

  4. 2-trip detection logic

DTC Detection Condition 1:


  • Shift solenoid valve SL2

  • Transmission revolution sensor (NC3)

  • Valve body assembly

  • Torque converter assembly

  • Automatic transmission assembly

DTC Detection Condition 2:


  • Shift solenoid valve SL2

  • Shift solenoid valve SR

  • Transmission revolution sensor (NC3)

  • Shift solenoid valve SLT

  • Valve body assembly

  • Torque converter assembly

  • Automatic transmission assembly

 Comes on DTC stored

MONITOR DESCRIPTION

The TCM 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 TCM detects the actual gear (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear position). When the gear commanded by the TCM and the actual gear are not the same, the TCM illuminates the MIL and store this DTC.

WIRING DIAGRAM

Refer to DTC P0748 and P2765.

P0748: Click here

P2765: Click here

CAUTION / NOTICE / HINT

Note

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

Click here

Tech Tips

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


  1. Perform the D Position Shift Test in Road Test.

    Click here

  2. Turn the engine switch off.

  3. Perform step (1) again.

  4. Check for DTCs again.

    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 / ECT / Trouble Codes.


      Powertrain > ECT > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only DTCs P0771, P0776 and P2714 are output A
      Only DTC P0776 is output B
      P0771, P0776, P2714, and other DTCs are output C

      Tech Tips

      If any DTCs other than P0771, P0776 and P2714 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.

      Tech Tips

      Write down the currently output DTCs before clearing them.


      Powertrain > ECT > Clear DTCs

    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.

      Tech Tips

      Write down the currently output DTCs before clearing them.


      Powertrain > ECT > Clear DTCs

    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. B0065PXC01
      *a 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 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.
      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 clutch 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. B00658BC28
      *a

      Front view of wire harness connector

      (to Transmission Wire)

      Disconnect the F25 transmission wire connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F25-11 (NC3B) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F25-12 (NC3O) - Body ground Always 99 to 101 Ω
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  8. INSPECT TRANSMISSION WIRE (TRANSMISSION REVOLUTION SENSOR NC3)


    1. B0065MKC05
      *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 F25 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 - TCM)


    1. Disconnect the F25 transmission wire connector.

    2. Disconnect the F8 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F25-11 (NC3B) - F8-19 (NC3B) Always Below 1 Ω
      F25-12 (NC3O) - F8-18 (NC3O) Always Below 1 Ω
      F25-11 (NC3B) or F8-19 (NC3B) - Body ground Always 10 kΩ or higher
      F25-12 (NC3O) or F8-18 (NC3O) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - TCM)

    OK

  10. REPLACE TCM


    1. Replace the TCM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM A/T CODE REGISTRATION Click here

  11. INSPECT SHIFT SOLENOID VALVE SLT


    1. B00662VC46
      *a

      Component without harness connected

      (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 2 and a negative (-) lead to terminal 1 of the 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. B00662VC46
      *a

      Component without harness connected

      (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 2 and a negative (-) lead to terminal 1 of the 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