Toyota Avalon V6-3.5L (2GR-FE) P Code Page 2047

Toyota Avalon V6-3.5L (2GR-FE) P Code Page 2047

SYSTEM DESCRIPTION

The TCM uses signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, intermediate (counter) speed sensor and

crankshaft position sensor to help determine the engagement timing of the lock-up clutch. The TCM monitors the engagement of the clutch using the

turbine (input) speed sensor, intermediate (counter) speed sensor and crankshaft position sensor.

Then the TCM compares the engagement condition of the lock-up clutch with the lock-up schedule in the TCM memory to detect shift solenoid

valve SL, valve body and torque converter clutch mechanical problems.

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the TCM based on the speed sensor (NT), speed sensor (NC), engine rpm, engine load, engine

temperature, vehicle speed, transmission fluid temperature, and gear selection. The TCM determines the lock-up status of the torque converter by

comparing the engine rpm (NE) to the input turbine rpm (NT). The TCM calculates the actual transmission gear by comparing the input turbine rpm

(NT) to the counter gear rpm (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to the shift solenoid

SL. When the SL is turned on, it applies pressure to the lock-up relay valve and locks the torque converter clutch.

If the TCM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the TCM interprets this as a fault in

the shift solenoid valve SL or lock-up system performance. The TCM will turn on 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 between the input side (engine speed) and output side (input turbine speed) of the torque converter when the

TCM commands lock-up.

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

- There is no difference in rotation between the input side (engine speed) and output side (input turbine speed) of the torque converter when the

TCM commands lock-up off.

(The difference between the engine speed and input turbine speed is less than 20 rpm.)

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS