Exam 129: Automatic Transmissiontransaxle Diagnosis and In-Vehicle Service

All automatic transmission fluid levels are checked with the engine running.

Two technicians are discussing an automatic transmission that will not go into any forward gear or reverse. Technician A says that a defective PCM or TCM could be the cause. Technician B says that a defective or worn pump could be the cause. Which technician is correct?

A General Motors vehicle is being tested using a scan tool. The input speed and the output speed sensor read the same when at highway speed. Technician A says that the transmission/transaxle is in a gear where the ratio is 1:1. Technician B says that the torque converter clutch must be defective and not working. Which technician is correct?

A transmission that will not upshift could be caused by ________.

A transmission fluid leak can be caused by an overfilled transmission.

Technician A says that a stall speed of more than 200 rpm above specification indicates the torque converter stator one-way clutch is not holding. Technician B says that a stall speed that is 250 to 350 rpm below specification indicates possible clutch or band slippage. Which technician is correct?

Technician A says that some manufacturers do NOT specify stall tests for their transmissions. Technician B says that stall testing can damage the transmission. Which technician is correct?

A scan tool can be used to ________.

Caution should be used when performing a stall test because ________.

What is the technician doing in this illustration?

Which of the following is NOT part of a stall test procedure?

An electronically shifted automatic transmission operates okay in reverse, but the vehicle does not shift at all when moving forward. Technician A says that a defective torque converter is the likely cause. Technician B says that a defective shift solenoid could be the cause. Which technician is correct?

Technician A says that fluid level concerns rarely contribute to automatic transmission concerns. Technician B says that dark, burnt ATF means the PCM is improperly commanding shift activity. Which technician is correct?

An electronically shifted overdrive automatic transmission is equipped with a transmission fluid temperature sensor. Technician A says that the shifts may be changed if the fluid temperature is too high. Technician B says that overdrive may be disabled if the transmission fluid temperature is too high. Which technician is correct?

When transmission fluid temperature begins to rise above a preset limit, the TCC ________.

Technician A says that the apply and hold units are usually the same for first gear when the gear selector is in drive or manual first. Technician B says that a defective vacuum modulator could cause the automatic transmission to delay shifting until a higher-than-normal speed is achieved. Which technician is correct?

Fluid exchange can be performed using ________.

Two technicians are discussing inspection of the transmission pan. Technician A says that some friction material at the bottom of the pan is normal. Technician B says that if any metal parts stick to a magnet then further investigation is needed to determine the cause. Which technician is correct?

Two technicians are discussing what could be wrong with a hydraulically shifted automatic transmission/transaxle that does not shift out of first gear regardless of vehicle speed. Technician A says that a defective governor could be the cause. Technician B says that a weak pump could be the cause. Which technician is correct?