Models
2013-’16 TT
2015-’16 A3, Q3
Symptoms:
On the models listed, the all-wheel-drive does not work or the EPC warning light is illuminated. The technician will find there is an internal leak in the hydraulic pump.
Correction:
Replace the pump with the improved part OCQ598549, fill the fluid in the case and recalibrate the differential with a scan tool.
Courtesy of Mitchell 1.
AWD is always engaged and with the ABS brake modulator, can perform like systems with limited-slip differentials.
Many AWD systems came onto the market in the 1990s. Unlike 4x4 truck systems of the day, these systems were always engaged. Many of the early systems used electro-mechanical ways to manage the distribution of power to thefour wheels.
Most of these systems used viscous differentials and limited-slip differentials with special fluids inside. These components were prone to failure and are expensive to manufacture. The performance of these systems could also be challenging to control with sensors and actuators.
This tech tip involves complaints about brake noise in a Ford Escape Hybrid’s system.
Knowing what the common issues are & understanding the options available to isolate & fix problems are the keys to success.
No matter the manufacturer, there is almost always an all-wheel drive (AWD) option.
Parts that wear out must be replaced.
To get the most out of these “liquid” tools, you first need to know how they work.
The alignment of these vehicles can be straightforward mechanically
You need to know how transmission fluid flows inside an automatic transmission.
Can a bump set a wheel speed sensor code?
