Electrical

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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.

Battery cable diagram

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.


Vehicle grounding diagram

MJ4 Wiring harness routing diagram

Harness routing

MJ2 Fuse & Relay Locations

Page 1 : Description

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 page 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 01 : Supplies

Page 1a : Supplies 1/2

Page 1b : Supplies 2/2

Page 02 : Starter, Alternator & Ignition

Page 03 : Engine Management (N/A)

Page 04 : Engine Management (Turbo)

Page 05 : Fuel Pump

Page 06 : Headlamps and Motors (Microswitches)

Page 06A : Headlamps and Motors

Page 07 : Horns

Page 08 : Windscreen Wash Wipe

Page 09 : Side and Tail Lamps

Page 10 : Interior Lamps

Page 11 : Stop Lamps

Page 12 : Reverse Lamps

Page 14 : Rear Fog Lamps

Page 15 : Direction Indicators and Hazard

Page 16 : Window Lift

Page 17 : In Car Entertainment

Page 18 : Cooling Fans

Page 19 : Heater and Air Conditioning

Page 20 : Central Door Locking

Page 21 : Door Mirrors

Page 22 : Rheostat and Panel Illumination

Page 23 : Clock and Cigar Lighter

Page 24 : Instruments

Page 25 : Warning Lights

Page 26 : Diagnostics ALDL

Page 27 : Battery Services (Fuse A12)

Page 28 : Ignition Services (Fuse A18)

Page 29 : Alarm System

Page 30 : Rear Lamp Cluster

Appendix 1 : Convention

Appendix 2 : Inter Harness Connectors 1 (mating face)

Appendix 3 : Inter Harness Connectors 2 (mating face)

MJ25 Circuit Diagrams (S2)

Page 29 : S2 Alarm System

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