AUTOMATIC TRANSMISSION SYSTEM(for 2GR-FSE), Diagnostic DTC:P2808

DTC Code DTC Name
P2808 Pressure Control Solenoid "G" Performance (Shift Solenoid Valve SL4)

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 SL4:
TCM commanded gear 1st 2nd 3rd 4th 5th 6th 7th 8th
Actual gear during SL4 stuck ON malfunction 4th 4th 3rd 4th 6th 6th 7th 6th
Actual gear during SL4 stuck OFF malfunction 1st 2nd 3rd N (1st)* 5th N* 7th 8th

*: Neutral

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2808 Pressure Control Solenoid "G" Performance (Shift Solenoid Valve SL4)

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 4th gear

    (b) When gear shifts to 2nd are requested by the TCM, actual gear changes to 4th gear

    (c) When gear shifts to 5th are requested by the TCM, actual gear changes to 6th gear

    (d) When gear shifts to 8th are requested by the TCM, actual gear changes to 6th gear

  3. Malfunction status occurs 2 times (1 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 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. When gear shifts to 4th or 6th are requested by the TCM, 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 SL4

  • Valve body assembly

  • Torque converter assembly

  • Automatic transmission assembly

DTC Detection Condition 2:


  • Shift solenoid valve SL4

  • 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.

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 P2714 and P2808 are output A
      Only DTC P2808 is output B
      Only DTCs P0796, P2714 and P2808 are output C
      P2714, P2808, and other DTCs are output D

      Tech Tips

      If any DTCs other than P0796, P2714 and P2808 are output, perform troubleshooting for those DTCs first.


    B

    GO TO STEP 3 Click here

    C

    GO TO DTC P0796 FLOWCHART Click here

    D

    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. INSPECT SHIFT SOLENOID VALVE SL4


    1. B007782C46
      *a

      Component without harness connected

      (Shift Solenoid Valve SL4)

      Remove the shift solenoid valve SL4.

      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 SL4 - 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 SL4 Click here

  4. INSPECT SHIFT SOLENOID VALVE SLT


    1. B007782C46
      *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

    NG

    REPLACE SHIFT SOLENOID VALVE SLT 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 operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Click here

    NG

    REPLACE TORQUE CONVERTER ASSEMBLY Click here