Range Rover P38 - Fuel System Description and Operation
19
FUEL SYSTEM
NEW RANGE ROVER
32
DESCRIPTION AND OPERATION
Connectors C0635, C0636 and C0637 are angled and
have release buttons located on the top face. The
release buttons have to be pressed and the locking
levers pulled back to enable the connectors to be
disconnected from the ECM. Each of the connectors
have two integral blocks, one grey and one black,
which can be removed from the connector housing to
enable access to the back of the plugs. Block removal
is achieved by pressing the locking tags and sliding
the connector blocks outwards.
The E-box lid has two location tags on the bottom
edge which have to be aligned with the corresponding
holes in the E-box case before clipping the top of the
lid into position. Care should be taken not to trap any
wires when closing the E-box lid.
The ECM uses a ’flash’ electronic erasable
programmable read only memory (EEPROM). This
enables the ECM to be externally configured, to
ensure that the ECM can be updated with any new
information; this also allows the ECM to be configured
as many times as is necessary to meet changing
specifications and legislation.
The ECM memorises the positions of the crankshaft
and the camshaft when the engine has stopped via
the CKP and CMP sensors. This allows immediate
sequential fuel injection and ignition timing during
cranking. This information is lost if battery voltage is
too low (i.e. flat battery). So the facility will be disabled
for the first engine start after battery reconnection.
The ECM has various sensors fitted to the engine to
allow it to monitor engine condition. The ECM
processes these signals and decides what actions to
carry out to maintain driveability, after comparing the
information from these signals to mapped data within
its memory.
CAUTION: Do not connect test probes
connected to battery positive supply to
any ground pins on the ECM. THIS MAY
DESTROY THE ECM.