Engine management system - V8 (SLABS ECU): Description and operation
- Make
- Land Rover
- Model
- Discovery II (UK)
- Section
- Description and operation › SLABS ECU
Input/Output The input from the cruise control master switch to the cruise control ECU is either a 12 Volts ignition feed or an open circuit. 12 Volts indicates that the cruise control master switch is on and the system can be activated. An open circuit indicates that the cruise control master switch is off and cruise control cannot be activated.
TestBook will not communicate with the cruise control ECU if the cruise control master switch is off.
SLABS ECU
The SLABS ECU provides the road speed signal to the cruise control ECU. This is the same speed signal provided to the ECM. Cruise control will only operate between 28 - 125 mph (45 - 200 km/h). Cruise control will not operate if a road speed signal is not present.
Input/Output
The input from the SLABS ECU to the cruise control ECU is a square wave oscillating between 0 - 12 Volts at a frequency of 8,000 pulses per mile (1.6 km).
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