Discovery II
BRAKES
70-24
DESCRIPTION AND OPERATION
Default strategies
Electrical data
Nominal resistance values for applicable brake control components are as detailed below:
Fault
Default strategy
Brake lamps relay
ABS: Enabled.
ETC: Enabled.
EBD: Enabled.
HDC: Enabled.
Throttle position signal failure
ABS: Enabled.
ETC: Disabled.
EBD: Enabled.
HDC: Immediately disabled if not in active braking mode; faded out then disabled if in active
braking mode.
No reference earth
ABS: Disabled.
ETC: Disabled.
EBD: Partly disabled.
HDC: Disabled.
Return pump or relay fault
ABS: Disabled.
ETC: Disabled.
EBD: Partly disabled.
HDC: Disabled.
Shuttle valve switch failure
ABS: Deceleration threshold increased; return pump activated if sum of output valve
actuation on one axle exceeds 140 milliseconds.
ETC: Disabled.
EBD: Inlet valves of rear axle close at vehicle deceleration rates of 0.3 g and above.
HDC: Disabled.
SLABS ECU internal failure
ABS: Disabled.
ETC: Disabled.
EBD: Disabled.
HDC: Disabled.
Supply voltage out of limits
ABS: Disabled.
ETC: Disabled.
EBD: Disabled.
HDC: Disabled.
Component
Resistance, ohms
Brake lamp relay coil
117 - 143
Return pump relay coil
82.8 - 101.2
ABS sensor
950 - 1100
Shuttle valve switches, both open (brakes off)
2977 - 3067
Shuttle valve switches, both closed (brakes on)
1007 - 1037
Shuttle valve switches, one open, one closed
1992 - 2052
Inlet solenoid valve
5.9 - 7.3
Outlet solenoid valve
3.0 - 3.6