Re: Transmission Problems

Posted by Vern-MI on February 13, 2004 at 17:23:21 from (207.69.137.22):

In Reply to: Transmission Problems posted by george on February 12, 2004 at 17:58:51:

Thanks George please let us know the outcome. This transmission also has a thermister on the printed circuit board to indicate to the computer the operating temperature of the transmission. It also has a speed sensor on the extension housing to indicate vehicle speed and allow the computer to schedule the shifts based on engine speed, throttle angle, engine temperature, and a host of other inputs. This sensor may be going bad as well but not likely. If a sensor goes bad it generally undershoots or exceeds the expected voltage range for that transducer in which case a trouble code for that particular transducer would be demonstrated.

The controls are open loop in that the variable force solenoid counts and consequent transmission operating pressure is established by shift lever position, vehicle speed, engine speed, throttle angle and operating temperature. There isn't any transducer to indicate to the computer that the pressure in the transmission is being controlled at the expected value.

What is strange is the fact that the symptom went away for a short period after the fluid flush. Maybe just a coincidence.

Whenever changing fluid always remove the oil pan and change the strainer and then drain the 8 quarts out of the converter by removing the 1/8" pipe plug from the circumference of the converter. Clean and or replace the magnet which is in the oil pan as well.

I'm betting on the manual lever position switch on the side of the transmission.

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