Electrical
Contents
- 1 Lotus Service Notes : Electronic MPFI (Closed Loop) Turbo with Catalyst (EMJ)
- 2 Lotus Service Notes : Electrical (MJ)
Lotus Service Notes : Electronic MPFI (Closed Loop) Turbo with Catalyst (EMJ)
EMJ4 Engine Components / Wiring Diagrams / Diagnostic Charts
The wiring of the O2 sensor (the CO pot input now serves as the EGR sensor input) is as shown on Page 32
Lotus Service Notes : Electrical (MJ)
MJ6 Battery Cables & Earth Braids & Earthing Points
Battery cables
The battery -ve cable runs from the battery to an earth point on the chassis RH suspension outrigger. A second cable from the battery -ve terminal connects with a -ve post at the LHS of the battery compartment. This -ve post provides an earth point for the rear harness, fuel pump harness and aerial.
The positive battery cable runs forward along the tunnel top to a +ve post beneath the fascia. This post provides a take off point for the maxi fuses which supply the major circuit feeds. A separate lead connects this post with the starter motor solenoid.
Earth cables and braids
- An earth cable connects the pedal box to the RH front of the chassis front crossmember.
- An earth braid at each rear corner of the engine bay connects each chassis front longeron to the chassis front crossmember.
- An earth braid connects the RH front (rear side) of the cylinder head to the RH end of the chassis front crossmember.
- An earth braid bridges the joint between the LH longeron and the chassis front frame.
- An earth braid at each side of the car connects the scuttle beam with the top of the A post. This braid is for suppression purposes only.
- An earth cable connects the driver's side end of the scuttle beam to the pedal box. This braid is for suppression purposes only.
Earthing points
- At the rear of the car, all earth leads terminate at the -ve post in the battery compartment
- All fascia and door harness earths terminate at the pedal box.
- The LH front harness is earthed to the LH longeron.
- The RH front harness is earthed to the RH longeron.
- The cooling fan harness is earthed to the radiator frame.
- All ECM earths terminate at an earth point on the engine at the RH end of the inlet manifold.
MJ4 Wiring harness routing diagram
MJ2 Fuse & Relay Locations
Page 2 : Main fusebox and above instrument cluster
Page 3 : Tunnel top and Battery compartment
Page 4 : Above drivers footwell and the same as viewed in a mirror
See Relays and Fuses pages for photographs.
MJ21 S2 Fuse & Relay Locations
Page 1 : Main fusebox and left hand speaker enclosure
Page 2 : Above instrument cluster
Page 3 : Above drivers footwell and the same as viewed in a mirror
MJ25 Circuit Diagrams (UK RHD)
Page 02 : Starter, Alternator & Ignition
Page 03 : Engine Management (N/A)
Page 04 : Engine Management (Turbo)
Page 06 : Headlamps and Motors (Microswitches)
Page 06A : Headlamps and Motors
Page 08 : Windscreen Wash Wipe
Page 15 : Direction Indicators and Hazard
Page 17 : In Car Entertainment
Page 19 : Heater and Air Conditioning
Page 20 : Central Door Locking
Page 22 : Rheostat and Panel Illumination
Page 23 : Clock and Cigar Lighter
Page 27 : Battery Services (Fuse A12)
Page 28 : Ignition Services (Fuse A18)
Appendix 2 : Inter Harness Connectors 1 (mating face)
Appendix 3 : Inter Harness Connectors 2 (mating face)
MJ25 Circuit Diagrams (S2)
MJ25 Circuit Diagrams (Fed)
Page 15 : Fed Direction Indicators and Hazard
Fig EMJ.4-7: Fed O2 Sensor Connections
Wiring colour codes
B : Black
G : Green
K : Pink
LG : Light green
N : Brown
O : Orange
P : Purple
R : Red
S : Slate
U : Blue
W : White
Y : Yellow
