AC60E AUTOMATIC TRANSMISSION / TRANSAXLE  AUTOMATIC TRANSMISSION SYSTEM(for 7GR-FKS)  P07407F  Torque Converter Clutch Actuator Stuck Off  

The ECM uses signals from the throttle position sensor, air-flow meter, transmission revolution sensor (NT), transmission revolution sensor (SP2) 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 (SP2) 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 shift solenoid valve SL, transmission valve body assembly and torque converter assembly mechanical problems.

Torque converter lock-up is controlled by the ECM based on the transmission revolution sensor (NT), transmission revolution sensor (SP2), engine speed, engine load, engine temperature, vehicle speed, transmission 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 (SP2). When conditions are appropriate, the ECM requests "lock-up" by applying control voltage to shift solenoid valve SL. When shift solenoid valve SL is turned on, it applies pressure to the lock-up relay valve and locks the torque converter.

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 shift solenoid valve SL 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.)

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.

NOTICE:

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

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ACTIVE TEST

HINT:

Using the GTS 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 ignition switch off.

c.

Connect the GTS to the DLC3.

d.

Turn the ignition switch to ON.

e.

Turn the GTS on.

f.

Enter the following menus: Powertrain / Transmission / Active Test / Activate the Lock Up Solenoid.

g.

Perform the Active Test according to the display on the GTS.

Powertrain > Transmission > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Activate the Lock Up Solenoid	Controls the shift solenoid valves SLU and SL to set the automatic transmission to the lock-up condition.	ON/OFF Start/Stop	Can be used to check shift solenoid valves SLU and SL operation. [Vehicle Condition] · Vehicle speed: 70 km/h (44 mph) or more · Gear: Highest gear · Throttle valve opening angle: Less than 20%

Powertrain > Transmission > Active Test

Tester Display
Activate the Lock Up Solenoid

50004 373 42008

HINT:

This test can be conducted when the vehicle speed is 70 km/h (44 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 turned off.)

4.531,2.188 5.542,1.958 5.542,1.958 5.604,1.958 false 5.125,2.24 5.542,2.583 5.542,2.583 5.604,2.583 false 0.719,2.677 1.646,2.875 0.927,0.198 10 Engine Speed 0.719,1.677 1.906,2.094 1.188,0.417 10 Accelerator Pedal Fully Released 0.719,1.021 1.906,1.438 1.188,0.417 10 Accelerator Pedal Opening Angle 4.99,3.125 5.438,3.323 0.448,0.198 10 Time 5.656,1.865 6.615,2.063 0.958,0.198 10 Lock-up OFF 5.656,2.49 6.615,2.688 0.958,0.198 10 Lock-up ON