AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P07957F

DTC Code DTC Name
P07957F Pressure Control Solenoid "C" Actuator Stuck Off

DESCRIPTION

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

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

Tech Tips

Actual gear when a malfunction occurs in solenoid (SL3) valve (without fail-safe control):
ECM commanded gear Actual gear during SL3 stuck ON malfunction Actual gear during SL3 stuck OFF malfunction
1st 7th 1st
2nd 9th 2nd
3rd 10th 3rd
4th 8th 4th
5th 7th 5th
6th 7th 6th
7th 7th Neutral
8th 8th Neutral
9th 9th Neutral
10th 10th Neutral
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P07957F Pressure Control Solenoid "C" Actuator Stuck Off

The vehicle is driven with the shift state in drive (D) and one of the following conditions is met (2-trip detection logic):


  • When the ECM commands the transmission to shift to 1st, the actual gear changes to 7th gear.

  • When the ECM commands the transmission to shift to 2nd, the actual gear changes to 9th gear.

  • When the ECM commands the transmission to shift to 3rd, the actual gear changes to 10th gear.

  • When the ECM commands the transmission to shift to 7th to 10th, the engine speed overruns (neutral status) continuously for 0.5 seconds or more.

  • Solenoid (SL1) valve

  • Solenoid (SL2) valve

  • Solenoid (SL3) valve

  • Solenoid (SL4) valve

  • Solenoid (SL5) valve

  • Solenoid (SL6) valve

  • Solenoid (SC1) valve

  • Solenoid (SC2) valve

  • Solenoid (SC3) valve

  • Solenoid (SL) valve

  • Solenoid (SR) valve

  • Solenoid (SLU) valve

  • Solenoid (SLT) valve

  • Transmission valve body assembly

  • Torque converter assembly

  • Automatic transmission assembly (clutch, brake, gear, etc.)

 Comes on DTC stored SAE: P0796
DTC Detection Condition Patterns
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnostic Condition The vehicle is driven with the shift state in drive (D). ○ ○ ○ ○
Malfunction Condition When the ECM commands the transmission to shift to 1st, the actual gear changes to 7th gear. ○ - - -
When the ECM commands the transmission to shift to 2nd, the actual gear changes to 9th gear. - ○ - -
When the ECM commands the transmission to shift to 3rd, the actual gear changes to 10th gear. - - ○ -
When the ECM commands the transmission to shift to 7th to 10th, the engine speed overruns (neutral status). - - - ○
Duration - - - 0.5 seconds or more
Detection Logic 2-trip detection logic 2-trip detection logic 2-trip detection logic 2-trip detection logic

Tech Tips

This DTC is output when any one of the above detection patterns is met.

MONITOR DESCRIPTION

The ECM commands gear shifts by turning the 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, 8th, 9th or 10th 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

Tech Tips

After repair has been completed, clear the DTC 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 at least 30 seconds.

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

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

    Click here

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

  8. Input the DTC: P07957F.

  9. 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.

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 (IN ADDITION TO DTC P07957F)


    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
      DTC P07957F and DTC P07407E, P07457F, P076A71, P07707E, P07707F, P07757F, P08BA7F, P08CC7E, P08CC7F, P08D57E, P08D57F, P27137F, P27567F, P28077F and/or P28167F are output A
      Only DTC P07957F is output B
      DTCs other than P07407E, P07457F, P076A71, P07707E, P07707F, P07757F, P07957F, P08BA7F, P08CC7E, P08CC7F, P08D57E, P08D57F, P27137F, P27567F, P28077F and P28167F are also output C

      Tech Tips

      If any DTCs other than P07407E, P07457F, P076A71, P07707E, P07707F, P07757F, P07957F, P08BA7F, P08CC7E, P08CC7F, P08D57E, P08D57F, P27137F, P27567F, P28077F and P28167F are output, perform troubleshooting for those DTCs first.


    B

    GO TO STEP 3 Click here

    C

    GO TO DTC CHART Click here

    A

  2. CLEAR DTC AND PERFORM STALL SPEED TEST


    1. Clear the DTCs.

      Click here

      Tech Tips

      Write down the currently output DTCs before clearing them.


      Powertrain > Transmission > Clear DTCs

    2. Perform the stall speed test.

      Click here

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

    B

    GO TO STEP 6 Click here

    A

  3. INSPECT SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5), (SL6) AND (SLU) VALVE


    1. B000YFQC19
      *1 Solenoid (SL1), (SL2), (SL3), (SL4), (SL5), (SL6) and (SLU) Valves

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

      Click here

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

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

    NG

    REPLACE SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5), (SL6) OR (SLU) VALVE Click here

    OK

  4. INSPECT SOLENOID (SC1), (SC2) AND (SC3) VALVE


    1. B000WJDC02
      *1 Solenoid (SC1), (SC2) and (SC3) Valves

      Remove the solenoid (SC1), (SC2) and (SC3) valves.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal of solenoid (SC1) valve connector - Solenoid (SC1) valve body 20°C (68°F) 11 to 15 Ω
      Terminal of solenoid (SC2) valve connector - Solenoid (SC2) valve body 20°C (68°F) 11 to 15 Ω
      Terminal of solenoid (SC3) valve connector - Solenoid (SC3) valve 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 SOLENOID (SC1), (SC2) OR (SC3) VALVE Click here

    OK

  5. INSPECT SOLENOID (SL) AND (SR) VALVE


    1. B000V1CC03
      *1 Solenoid (SL) and (SR) Valves

      Remove the solenoid (SL) and (SR) valves.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal of solenoid (SL) valve connector - Solenoid (SL) valve body 20°C (68°F) 11 to 15 Ω
      Terminal of solenoid (SR) valve connector - Solenoid (SR) valve 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 SOLENOID (SL) OR (SR) VALVE Click here

    OK

  6. INSPECT SOLENOID (SLT) VALVE


    1. B000YFQC19
      *1 Solenoid (SLT) Valve

      Remove the solenoid (SLT) valve.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 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 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

    NG

    REPLACE SOLENOID (SLT) VALVE Click here

    OK

  7. 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

  8. INSPECT TORQUE CONVERTER ASSEMBLY


    1. Check the torque converter assembly.

      Click here

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

    NG

    REPLACE TORQUE CONVERTER ASSEMBLY Click here

    OK

  9. REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY


    1. Repair or replace the automatic transmission assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM A/T CODE REGISTRATION Click here