Practice Test Flashcards

All of these claims about replacing and removing transmissions are accurate, EXCEPT:

Answer: The front drive axles need to be marked in relation to the front hubs.

Front drive axles are typically splined and designed to fit into the front hubs in any rotational orientation, meaning there is no specific alignment required for balance or function upon reinstallation. In contrast, driveshafts connected to differential flanges should be marked to maintain their original balance and prevent vibration issues. Disconnecting the battery and supporting the engine are crucial safety and procedural steps.

On an electronic DI system, the negative primary coil connection connects the 12-volt test light to ground. When the engine starts, this light flutters. When the coil secondary wire is connected to ground when the engine is cranking, a spark tester likewise doesn't light. Which explanation is the MOST plausible one?

Answer: Defective ignition coil

The fluttering test light on the primary coil connection indicates that the ignition module is correctly switching the primary circuit on and off, meaning the module and pickup coil are likely functioning. However, the absence of spark at the secondary wire, despite proper primary circuit operation, points directly to an internal failure within the ignition coil itself. The coil is failing to step up the voltage to produce a high-energy spark.

What should you do first when trying to diagnose coolant consumption?

Answer: Perform a cooling system pressure test

Performing a cooling system pressure test is the most effective first step when diagnosing coolant consumption because it can quickly identify both external and internal leaks. By pressurizing the system to its operating pressure, even small leaks that might not be visible under normal conditions can be revealed, providing a comprehensive assessment of the system's integrity. While visual checks and oil condition are important, a pressure test offers a more definitive starting point.

When loaded, the transaxle abruptly shifts out of gear. Which of these is MOST likely to be the cause?

Answer: Maladjusted, loose or worn shift linkage

When a transaxle abruptly shifts out of gear under load, it often indicates that the gear is not fully engaged or is being dislodged due to external forces. Maladjusted, loose, or worn shift linkage prevents proper engagement or allows the linkage to move, causing the transmission to pop out of gear, especially when torque is applied. The other options relate to internal transmission issues or clutch problems, which would manifest differently.

Which of these places doesn't frequently have coolant leaks?

Answer: Faulty gasket

While gaskets can certainly fail, components like hoses, water pumps, and core plugs are often exposed to more direct wear, vibration, and corrosive elements, leading to more frequent leaks. Hoses degrade over time, water pumps have moving parts and seals that wear out, and core plugs corrode, making these more common points of failure compared to many engine gaskets which are designed for long-term sealing under stable conditions.

What roughly sized amount of refrigerant is released from the AC compressor high-pressure release valve?

Answer: 475 psi (3,275 kPa)

The high-pressure release valve in an automotive AC compressor is designed to open and vent refrigerant when the system pressure exceeds a safe limit, typically around 475 psi (3,275 kPa). This safety mechanism prevents damage to the compressor and other AC components from excessive pressure buildup.

Which of the following tasks does the torque converter need to perform when the engine is removed from a car with an automatic transmission?

Answer: Remains with the transmission

When removing an engine from a vehicle equipped with an automatic transmission, the torque converter is designed to remain with the transmission. It slides onto the transmission's input shaft and pump stator support, and removing it with the engine can damage the transmission pump or cause fluid leakage.

All of these claims about the A/C-heater control panel service are true, WITH THE EXCEPTION OF:

Answer: You must discharge the refrigeration system before the A/C control panel removal.

The A/C-heater control panel is an electrical component responsible for controlling the various functions of the HVAC system, such as fan speed, temperature, and vent selection. It is not directly connected to the refrigerant lines or the sealed refrigeration system. Therefore, discharging the refrigerant is completely unnecessary for its removal or service.

Before removing the transmission or transaxle from the vehicle, all of these components APART from

Answer: Front bearing retainer

The front bearing retainer is an internal component of the transmission or transaxle, typically part of the input shaft assembly, and is not removed as a separate step before the entire transmission unit is taken out of the vehicle. Components like axle drive shafts, reverse light connectors, and speed sensors are external connections that must be disconnected prior to transmission removal.

The following causes are the least likely to result in blue exhaust emissions:

Answer: Worn valve seats

Blue exhaust smoke indicates that the engine is burning oil. Worn piston rings, worn valve seals, and a damaged cylinder head can all allow engine oil to enter the combustion chamber and be burned. Worn valve seats primarily affect the sealing of the valves, leading to compression loss or burnt valves, but do not directly cause oil to enter the combustion chamber to produce blue smoke.

Which of the following is determined by the automatic transmission pressure test?

Answer: Dirty transmission filter

An automatic transmission pressure test measures the hydraulic pressures within the transmission at various points and operating conditions. Low or erratic pressures can indicate a restriction in the fluid flow, with a dirty or clogged transmission filter being a common cause by impeding the pump's ability to draw in sufficient fluid and maintain proper pressure.