gf4015p2005rt

Detection of pressure loss, function

Type gf · topic 40.15 · version 0103 · 2008-03-25

Applies to: MODEL 251.1 with CODE (477) Tire pressure loss warning up to Model Year 8 MODEL 251.0 with CODE (477) Tire pressure loss warning up to Model Year 8

Where it sits

Function group 2 Chassis › 40 Wheels, chassis alignment check › 40.15 Tire pressure/tire pressure monitoring — Series 251 (models 0**, 1**)

GF40.15-P-2005RT

Detection of pressure loss, function

23.5.06

MODEL 251.1
with CODE (477) Tire pressure loss warning
up to Model Year 8

MODEL 251.0
with CODE (477) Tire pressure loss warning
up to Model Year 8

Detection of pressure loss, function

P54.30-9401-71

Warning message

Detection of pressure loss, function

P54.30-8761-01

Reminder message

Function

The ESP control unit (N47-5) compares the 4 wheel speeds depending on the tire pressure. A learning phase follows reactivation. In this phase in 6 different vehicle speed intervals the relative rolling circumferences of the tires are taught in and stored. The tire pressure loss warning (RDW) is not active during this learning process. The coordination of the individual intervals takes 10 minutes/interval. From this point onward the tires:

FL and RR,

RF and LR

are subjected to mutual comparisons.

Warning message

The tire pressure loss warning RDW has established while driving that the rolling circumferences of the wheels have changed relative to each other (considerable pressure loss in one tire).

Reminder message

This message is displayed in the multifunction display (A1p13) after a red warning message, if tire pressure loss warning is not subsequently reactivated.

ESP/BAS control unit, component description

GF42.45-P-4502RT

Referenced documents