Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Torque Converter Clutch Actuator Stuck On (P07407E)

DESCRIPTION

The ECM uses signals from the throttle position sensor, mass air flow meter, transmission revolution sensor (NT), transmission revolution sensor (NC) and crankshaft position sensor to help determine the engagement timing of the lock-up clutch. The ECM monitors the engagement of the clutch using the transmission revolution sensor (NT), transmission revolution sensor (NC) and crankshaft position sensor.

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

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the ECM based on the transmission revolution sensor (NT), transmission revolution sensor (NC), engine speed, engine load, engine temperature, vehicle speed, automatic transaxle fluid temperature, and gear selection. The ECM determines the lock-up status of the torque converter by comparing the engine speed (NE) to the input turbine speed (NT). The ECM calculates the actual transmission gear by comparing the input turbine speed (NT) to the output shaft speed (NC). When certain conditions are met, the ECM requests "lock-up" by cutting control voltage to the solenoid (SL) valve. When the solenoid (SL) valve is turned off, pressure is applied to the lock-up relay valve and the torque converter is locked.

If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the ECM interprets this as a fault in the solenoid (SL) valve or lock-up system performance. The ECM will illuminate the MIL and store the DTC.

HINT:

Example:

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

• There is a difference in rotation speed between the input side (engine speed) and output side (input turbine speed) of the torque converter when the ECM commands lock-up.

  (Engine speed is at least 70 rpm more than the input turbine speed.)

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

  (The difference between engine speed and input turbine speed is less than 35 rpm.)

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

HINT:

• 1st gear

  Any of the following conditions are met	(a) or (b)
  (a) Turbine speed/Output speed (NT/NO)	4.682 or more and 9.515 or less (When output speed less than 50 rpm)
  (b) NT-NO x 1st gear ratio	-50 rpm or more and 50 rpm or less (When output speed 50 rpm or more)

  2nd gear

  Any of the following conditions are met	(a) or (b)
  (a) Turbine speed/Output speed (NT/NO)	2.900 or more and 3.467 or less (When output speed less than 180 rpm)
  (b) NT-NO x 2nd gear ratio	-50 rpm or more and 50 rpm or less (When output speed 180 rpm or more)

  3rd gear

  Any of the following conditions are met	(a) or (b)
  (a) Turbine speed/Output speed (NT/NO)	1.910 or more and 2.189 or less (When output speed less than 350 rpm)
  (b) NT-NO x 3rd gear ratio	-50 rpm or more and 50 rpm or less (When output speed 350 rpm or more)

  4th gear

  Any of the following conditions are met	(a) or (b)
  (a) Turbine speed/Output speed (NT/NO)	1.401 or more and 1.581 or less (When output speed less than 350 rpm)
  (b) NT-NO x 4th gear ratio	-50 rpm or more and 50 rpm or less (When output speed 350 rpm or more)

  5th gear

  Any of the following conditions are met	(a) or (b)
  (a) Turbine speed/Output speed (NT/NO)	1.142 or more and 1.323 or less (When output speed less than 550 rpm)
  (b) NT-NO x 5th gear ratio	-50 rpm or more and 50 rpm or less (When output speed 550 rpm or more)

  6th gear

  Any of the following conditions are met	(a) or (b)
  (a) Turbine speed/Output speed (NT/NO)	0.934 or more and 1.065 or less (When output speed less than 750 rpm)
  (b) NT-NO x 6th gear ratio	-50 rpm or more and 50 rpm or less (When output speed 750 rpm or more)

  7th gear

  Any of the following conditions are met	(a) or (b)
  (a) Turbine speed/Output speed (NT/NO)	0.737 or more and 0.867 or less (When output speed less than 750 rpm)
  (b) NT-NO x 7th gear ratio	-50 rpm or more and 50 rpm or less (When output speed 750 rpm or more)

  8th gear

  Any of the following conditions are met	(a) or (b)
  (a) Turbine speed/Output speed (NT/NO)	0.621 or more and 0.725 or less (When output speed less than 950 rpm)
  (b) NT-NO x 8th gear ratio	-50 rpm or more and 50 rpm or less (When output speed 950 rpm or more)

• Any of the following conditions are met: Condition (a) or (b)
  • Condition (a)

    ECM selected gear	6th, 7th or 8th
    Output speed x 5th gear ratio	7200 rpm or more

    Condition (b)

    ECM selected gear	4th or 5th
    Output speed x 3rd gear ratio	7200 rpm or more

TYPICAL MALFUNCTION THRESHOLDS

Any of the following conditions are met: OFF malfunction (A), (B) or (C)

CONFIRMATION DRIVING PATTERN

CAUTION:

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

HINT:

• 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.
• When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

  Click here

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream 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 Techstream on.
6. Start the engine.
7. Perform the Lock-up Function inspection in Road Test. [*1]

   Click here

   HINT:

   [*1] : Normal judgment procedure.

   The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

8. Stop the vehicle.
9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
10. Input the DTC: P07407E.
11. Check the DTC judgment result.

    Techstream 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

    HINT:

    • 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 normal judgment procedure again.

WIRING DIAGRAM

Refer to DTC P074011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

• Perform the universal trip to clear permanent DTCs.

  Click here

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

  Click here

ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Warm up the engine.

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Active Test.

(g) According to the display on the Techstream, perform the Active Test.

HINT:

This test can be conducted when the vehicle speed is 60 km/h (36 mph) or more.

(h) Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.

HINT:

• When changing the accelerator pedal opening angle while driving, if the engine speed does not change, lock-up is on.
• Slowly release the accelerator pedal in order to decelerate, but do not fully release the pedal. (Fully releasing the pedal will close the throttle valve and lock-up may be prohibited.)

PROCEDURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.

(e) Read the DTCs using the Techstream.

HINT:

If any other codes besides P07407E are output, perform the troubleshooting for those DTCs first.

B

GO TO DTC CHART

A

(a) Disconnect the C52 transmission wire connector.

*a Component without harness connected (Transmission Wire)

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

Standard Resistance:

NG

GO TO STEP 7

OK

(a) Remove the solenoid (SL) valve. Click here

*1 Solenoid (SL) Valve

(b) 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.

NG

REPLACE SOLENOID (SL) VALVE

OK

(a) Inspect the transmission valve body assembly.

Click here

OK:

There is no foreign matter on each valve and they operate smoothly.

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

(a) Inspect the torque converter assembly.

Click here

OK:

The torque converter assembly is normal.

NG

REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY

OK

(a) Repair or replace the automatic transaxle assembly.

Click here

NEXT

PERFORM REGISTRATION

(a) Remove the solenoid (SL) valve. Click here

*1 Solenoid (SL) Valve

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

Standard Resistance:

OK

REPAIR OR REPLACE TRANSMISSION WIRE

NG

REPLACE SOLENOID (SL) VALVE