AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P27567F

DTC Code DTC Name
P27567F Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off

DESCRIPTION

The ECM controls the solenoid (SLU) valve using a predetermined current, and performs lock-up and flex lock-up control.

The ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect mechanical malfunctions of the solenoid (SLU) valve, transmission valve body assembly and torque converter assembly.

B0070T1C02
*1 Spool Valve *2 Sleeve
*3 Solenoid Coil - -
*a Current *b Hydraulic Pressure
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P27567F Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off

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


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

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

  • The vehicle is being driven with the shift lever in D.

  • No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system.

  • Any of the following conditions are met:


    • When the ECM sends a lock-up OFF request, the difference between the input turbine speed (NT) and the engine speed (NE) is less than 35 rpm for 1.8 seconds or more.

    • When the ECM sends a lock-up ON request, the difference between the input turbine speed (NT) and the engine speed (NE) is 70 rpm or more for 3.5 seconds or more.

  • Solenoid (SLU) valve

  • Transmission valve body assembly

  • Torque converter assembly

  • Automatic transaxle assembly

 Comes on DTC stored

SAE Code:

P2757
DTC Detection Condition Patterns:
Vehicle Condition
Pattern 1 Pattern 2
Diagnostic Condition Engine coolant temperature is 40°C (104°F) or higher. ○ ○
ATF temperature is -10°C (14°F) or higher. ○ ○
The vehicle is being driven with the shift lever in D. ○ ○
No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system. ○ ○
Malfunction Condition When the ECM sends a lock-up OFF request, the difference between the input turbine speed (NT) and the engine speed (NE) is less than 35 rpm. ○ -
When the ECM sends a lock-up ON request, the difference between the input turbine speed (NT) and the engine speed (NE) is 70 rpm or more. - ○
Duration 1.8 seconds or more 3.5 seconds or more
Detection Logic 2-trip detection logic 2-trip detection logic

Tech Tips

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

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the ECM based on the transmission revolution sensor (NT and NC), engine speed, engine load, engine temperature, vehicle speed, ATF temperature and gear selection signals. The ECM determines the lock-up status of the torque converter assembly by comparing the engine speed (NE) to the transmission revolution sensor (NT) signal. The ECM calculates the actual gear by comparing the transmission revolution sensor (NT) signal to the transmission revolution sensor (NC) signal. When conditions are appropriate, the ECM requests "lock-up" by applying voltage to the solenoid (SLU) valve. When the solenoid (SLU) valve is turned on, pressure is applied to the lock-up relay valve and locks the torque converter assembly.

If the ECM does not detect lock-up after lock-up has been requested or if it detects lock-up when it is not requested, it interprets this as a malfunction of the solenoid (SLU) valve, illuminates the MIL and stores this DTC.

Tech Tips

Example:

When any of the following is met, the system judges it as a malfunction.


  • There is a difference in speed between the input side (engine speed) and output side (input turbine speed) of the torque converter assembly when the ECM commands lock-up. (Engine speed is at least 70 rpm more than input turbine speed.)

  • There is no difference in speed between the input side (engine speed) and output side (input turbine speed) of the torque converter assembly when the ECM commands lock-up off. (The difference between engine speed and input turbine speed is less than 35 rpm.)

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 ignition switch to ON and turn the GTS 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 GTS on.

  6. Start the engine.

  7. Perform the Lock-up Function inspection in Road Test.

    Click here

  8. Stop the vehicle.

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

  10. Input the DTC: P27567F.

  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.

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P27567F)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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 DTC P27567F is output A
      DTC P27567F and other DTCs are output B

      Tech Tips


      • If any DTCs other than P27567F are output, perform troubleshooting for those DTCs first.

      • If a solenoid valve is stuck ON or OFF, DTCs for several solenoid valves including the malfunctioning solenoid valve will be stored.


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT SOLENOID (SLU) VALVE


    1. B0071RQC76
      *a

      Component without harness connected

      (Solenoid (SLU) Valve)

      Remove the solenoid (SLU) valve.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      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 (SLU) VALVE Click here

    OK

  3. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Inspect 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

  4. INSPECT TORQUE CONVERTER ASSEMBLY


    1. Inspect the torque converter assembly.

      Click here

      OK
      The torque converter assembly is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY Click here

    OK

  5. REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY


    1. Repair or replace the automatic transaxle assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM REGISTRATION Click here