Range Rover P38
LAND ROVER V8
61
DESCRIPTION AND OPERATION
Transfer Box ECU (MIL input) - from 99MY (NAS only)
The input from the transfer box ECU to the ECM indicates that there is an OBD relevant error detected within the
transfer box ECU and requests activation of the MIL. In addition, the ECM carries out an integrity check on the
signal following an "ignition ON" condition.
See TRANSFER BOX, Description and operation.
Engine Speed Output - from 99MY
The ECM supplies engine speed information to various vehicle systems (instrument pack etc.). The system uses
an output frequency of 4 pulses per engine revolution.
HeVAC system interface - from 99MY
The diagnostics for the condenser fans and A/C grant signal is disabled and so it is not possible to detect open
and short circuit conditions on these lines.
The condenser fans can be switched on by either the HeVAC ECU or the engine management ECM (to assist
engine cooling) or by the fan control logic.
See HEATING AND VENTILATION, Description and operation.
See AIR CONDITIONING, Description and operation.
Fuel used signal - from 99MY
This output is required to provide fuel consumption information to the trip computer.
Fuel level input - from 99MY
This input is required by the ECM as part of the misfire detection strategy, in order to record a "low fuel" situation
was present when misfire was detected and logged as a fault. The signal is received as an analogue signal from
the fuel tank sender unit.
Fuel Level State
Sender Resistance
Fuel Level Signal
Voltage
Full
19 ohm
1.00 V
Empty
270 ohm
3.16 V
Low Fuel Lamp
ON threshold
above 175 ohm
2.77 V
Low Fuel Lamp
OFF threshold
less than 117 ohm
2.40 V