Workshop Manuals Factory service & repair Aston Martin
01 00 Introduction02 01 Body system03 02 Frame and mounting04 03 Engine05 04 Suspension06 05 Driveline07 06 Brake system08 07 Transmission09 08 Clutch10 09 Exhaust11 10 Fuel12 11 Steering13 12 Climate control14 13 Information, gauge and warning15 14 Power supply16 15 Vehicle entertainment17 16 Vacuum distribution18 17 Lighting19 18 Electric distribution and electronic control20 19 Electronic features21 20 Appendix and glossary
Aston Martin DB9 Factory Workshop Manual (Issue 2, 2005)07 · 06 Brake system
07 · Brakes

Engine Intervention

Make
Aston Martin
Model
DB9 Factory Workshop Manual
Year
Issue 2, 2005
Section
Anti-lock Braking System (ABS) › Engine Intervention
06 Brake systemEngine Intervention

Engine Intervention

In the event of wheel-slip the ABS / DSC module calculates the torque, which should be applied by the engine to reduce the wheel-slip (this torque does not exceed driver demand). Engine torque reduction is then requested from the PCM via the CAN bus. The PCM, in response to these signals, reduces engine torque by controlling the ignition and fuelling. A traction control gearshift pattern is automatically selected within the automatic transmission software whenever traction control is active.

Brake Intervention

This function operates by increasing the pressure in the brake caliper of the slipping wheel, by closing the separation valve and the inlet valve of the non-slipping wheel and running the modulator pump. This takes fluid from the fluid reservoir via the non-actuated master cylinder and pressurizes the brake caliper. The pressure is modulated at the caliper via the inlet and outlet valves to achieve the desired wheel-slip target to maximize traction.

ABS / DSC Circuit

Schematic diagram of the ABS/DSC circuit showing connections between the Underbonnet Fusebox, Module-ABS, various sensors (Steering Angle, Brake Pressure, Brake Pedal Travel, Yawrate/Acceleration), OBD2 Body (B), and Switch-Brake Boost with associated wire codes and connector pins.

Specifications

Oils/Greases

Brake Fluid Castrol Response Super Dot 4

Torque Figures

DescriptionNm.lb./ ft.
Modulator to Bracket54
Modulator / Bracket to body97
Brake hose unions1713
1410.5

Parts & tools for this job For 2005 Aston Martin DB9

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