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Re: car wont start...someone please help
The Automatic Transmission Fluid temperature sensor is inside the transmission pan and monitors the temperature of the automatic transmission fluid. There absolutely no communication to the engine control unit on this circuit, It is used by the TCU only. You are thinking of the ECT sensor. there is no fail code that the ECM will output to display a failed ATFT sensor, for the reasons stated above.
Code 21, furthermore, is for the ECT sensor.
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2007 GS 450h-Active Stabilizer/Radar cruise
1994 L Blue 3.70 VTD
ASE Master Automobile
ASE Advanced Level Specialist
Toyota Master Diagnostic Technician (former life)
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