Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
Gday. Please allow me to assist you. The number one reason torque converters do not lock is the coolant temperature is below 177 degrees F. Toyota has engineered the transmissions to not lock up until the engine is at operating temperature. The threshold is 177 degrees F. If the coolant temperature drops below 177, the trans computer will not allow the lock up solenoid to be powered up. This is common with vehicles that do not have a thermostat installed, an incorrect thermostat, or a thermostat that is sticking open too long. The recommendation I have for you on this request would be to have the coolant temperature measured. If it is below 177, it needs the thermostat replaced. If the coolant is above that, it is most likely you have a sluggish or otherwise sticking lock up solenoid. With 114,000 Km on the unit, a good transmission flush would be a very good idea at this time.
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