A vehicle equipped with an electronically controlled transaxle stalls whenever slowing to a stop after being driven over 20 miles (32 km). Technician A says that one of the shift solenoids could be defective. Technician B says that a torque converter clutch solenoid is likely to be defective. Which technician is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
d. Neither Technician A nor B
The correct answer is b. Technician B is correct because if the torque converter clutch solenoid were to become stuck in the applied position, the engine would stall because the torque converter clutch would provide a mechanical link between the engine and the drive wheels. When the drive wheels are stopped by the brakes, the engine speed is also stopped. Often the engine will restart immediately because when the engine stalls, the transmission line pressure drops to zero and the torque converter clutch is released. Technician A is not correct because a defective shift solenoid will cause incorrect shifting but cannot cause the engine to stall. Answers c and d are not correct because Technician B only is correct
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|Frequently Asked Questions|
What Do All the Letters and Numbers Mean in Transmission Designations?
The numbers and letters usually mean the following:
* Number of forward speeds. The number of forward speeds may include four, five, or six (such as GM 4T60-E four speed unit).
* Front-wheel drive or rear-wheel drive. The letter T usually means transverse (front-wheel-drive transaxle) such as the Chrysler 41-TE; the L means longitudinal (rear-wheel-drive transmission) such as the General Motors 6L80; and the R means rear-wheel drive such as the Ford 5R55E.
* Electronically controlled. The letter E is often used to indicate that the unit is electronically controlled, and M or H is used to designate older mechanically (hydraulically) controlled units. All automatic transmissions built since the early 1990s are electronically controlled; therefore, E is often included in the designation of newer designs of transmission or transaxles.
* Torque rating. The torque rating is usually designated by a number where the higher the number, the higher the amount of torque that the unit is designed to handle. In a GM 6L80-E the torque rating is 80. Always check service information for the exact transmission designation for the vehicle being studied or serviced.
From the Janaury 16, 2013, Wheels section in the Dayton Daily News:
Reader asks about oil change intervals for low mileage vehicle
TGC writes by e-mail:
"I changed the oil and filter in my 2010 Impala in December, 2011. As of this moment (late December 2012), I have put less than 1,500 miles on the car. Should I change the oil? I use Mobil-1 in my vehicles and change the oil when the mileage interval gets to 3,000 miles".
Good question because it seems that the oil should not have been harmed just sitting in the engine. However, all vehicle manufacturers that I know and most oil companies recommend that the engine oil be replaced at least every year regardless of the number of miles driven. Why? Short trips are hard on engines and engine oil. To drive off moisture that is in the oil due to condensation when the hot engine cools, the engine oil needs to be above 212 degrees. This means that the engine needs to operate at least 20 miles in cold weather for the engine oil to reach that temperature. If most of the trips are short (less than 10 miles), then moisture can build up which causes acids to form in the oil. The moisture causes corrosion of engine parts and the acids formed can harm engine bearings and gaskets.
Therefore, for long engine life, change the engine oil at least every year and always use the viscosity specified in the owner's manual and /or on the oil fill cap.
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James D. Halderman writes automotive technology textbooks for Pearson Education. He is an ASE-certified Master Technician with more than 20 years instructional experience.