Question about 2000 Ford Expedition

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I have a error code reading of PO 743, Torque converter clutch, what does that mean?

My Expedition will run but when put in gear it becomes sluggish and will not exelerate over 40 mph. The overdrive light flashes and the air will not get cold. We put it on a handheld tester and received several error codes, one was PO 743. Some others were PO 141, O2 sensor, PO 443 Evaporator Emission control, PO 1747 Pressure control solenoid. Could all these be controled by one sensor malfunctioning?

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It sounds like the convertor in the exhaust system is partly blocked. You will need to have this checked at a shop. Frankster016

Posted on Oct 26, 2008


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Code 0740 andd 0700

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Error codes

Her is the definition and a list of possiable causes.

Code P1740-Torque converter clutch did not lock up when the PCM sent the command. Enabling conditions: No engine or transmissions codes are present, vehicle speed was under 70 MPH, TPS was under 33% open. When the PCM commanded the torque converter to lock, no change was detected in engine speed. Blocking action: This code can block the following monitors: none.
Testing: Check torque converter solenoid for proper operation.
Theory of Operation
The Torque Converter Clutch (TCC) Solenoid is used to engage the TCC which improves fuel economy.
When Monitored
The Torque Convertor Clutch (TCC) and Overdrive Clutch (OD) will be tested each time the PCM requests TCC engagement in 3rd gear and OD.
Set Condition
The DTC will set if the expected RPM drop is not achieved while attempting to engage TCC or OD. This indicates a malfunctioning torque convertor or overdrive clutch.
Possible Causes

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