Land Rover Fuel Injection System Manual

LAND ROVER 
Figure 44 – Fuel temperature sender electrical connector
 
 
Figure 45 – Coolant temperature sender electrical connector
 
 
Figure 46 – Throttle position sensor (potentiometer) electrical con\
nector
 
Note it was found to be difficult to electrically connect to the ECU(20\
) wire on the back of the 
throttle plug – therefore a short external wire has been added to the\
 loom extending the red ECU 
(20) wire to an exposed (but insulated) spade connector just behind \
the throttle plug....

LAND ROVER 
Figure 47 – Diagnostics plug (item 34 in workshop manual) electrica\
l connector
 
The diagnostic display (located inside the cab) is coupled to this plu\
g. 
 
Figure 48 – Mass air flow sensor electrical connector
 
 
 
 
http://www.conehead.org/Projects/Landrover/EFi/efi%20-%20web.htm (42 of\
 55)16/10/2010 9:03:18 a.m. 

LAND ROVER 
Figure 49 – Bypass air valve electrical connector
 
 
 
 
 
 
 
 
 
 
http://www.conehead.org/Projects/Landrover/EFi/efi%20-%20web.htm (43 of\
 55)16/10/2010 9:03:18 a.m. 

LAND ROVER 
Figure 50 – Main cable connector linking loom to vehicle
 
The main cable connector was the primary method used to connect the inje\
ction loom to the 
vehicle electrical system. This plug was cut, and the wires fitted to a \
standard screw terminal chock 
block as shown below. 
 
 
Figure 51 – Main interface wiring chock block electrical connector
 
http://www.conehead.org/Projects/Landrover/EFi/efi%20-%20web.htm (44 of\
 55)16/10/2010 9:03:18 a.m. 

LAND ROVER 
 
 
 
 
 
Figure 52 – Original loom fuse arrangement
 
 
The original donor vehicle injection loom fuses were heavily oxidised an\
d were replaced using new 
water proof connectors. Both old and new employed spade style fuses. All\
 connections were 
soldered. 
 
 
 
http://www.conehead.org/Projects/Landrover/EFi/efi%20-%20web.htm (45 of\
 55)16/10/2010 9:03:18 a.m. 

LAND ROVER 
Figure 53 – New loom fuse arrangement
 
 
 
 
 
 
 
Figure 54 – Condenser fan and heater/air conn electrical connectors
 
The original wiring loom included a relay and connector to drive and int\
erface to the air 
conditioning system. The primary motive for linking the two systems is t\
o enable an increase in 
engine speed when the extra running load of the air conditioning compres\
sor is enabled. As the 
target vehicle does not employ air conditioning – this circuit is ent\
irely unused....

LAND ROVER 
 
Figure 55 – Break out cable (close to ECU) wiring of 25 way female \
D
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
http://www.conehead.org/Projects/Landrover/EFi/efi%20-%20web.htm (47 of\
 55)16/10/2010 9:03:18 a.m. 

LAND ROVER 
Figure 56 – Original coil wiring (when mounted on firewall)
 
 
 
 
 
http://www.conehead.org/Projects/Landrover/EFi/efi%20-%20web.htm (48 of\
 55)16/10/2010 9:03:18 a.m. 

LAND ROVER 
Figure 57 – New coil wiring (when mounted on passenger side fender)\
 
 
Figure 58 – Original ignition switch wiring
 
 
Figure 59 – New ignition switch wiring
 
 
Loom analysis results
The bench testing revealed only a small number of problems. The lambda s\
ensor wiring was open 
http://www.conehead.org/Projects/Landrover/EFi/efi%20-%20web.htm (49 of\
 55)16/10/2010 9:03:18 a.m. 

LAND ROVER 
circuit (both sides). Also the two active feed wires (not the common \
feeds) to the injectors had 
been deliberately cut close to the ECU. It was assumed that the injector\
 wiring had been spliced in 
the donor vehicle with an immobiliser. 
 
The lambda fault was traced to a splice that had been made in the origin\
al loom again close to the 
cut injector wiring. All four faults were repaired with fresh wiring, an\
d heat shrink. At the same 
spot, there were a total of six additional...