FQ101.co.uk
THE HOME OF MODIFICATION AND MAINTENANCE FOR YOUR SMART

This is only applicable to mk1-6 fortwos as the mk7 has all functions integrated into the SAM unit. If you car has a ZEE unit then you will have this additional engine fuse box.

Location

The engine electrical centre is located under the carpet beneath the left seat.

It is held with 2 10mm nylon nuts to the floorpan and is easily removed. To remove the cover, there are three clips located as follows:

Pull each black clip back whilst pulling the lid upwards.

This reveals the engine fuses and relays.

Fuses and Relays

The functions of the engine fuses and relays are as follows:

Petrol
Location Component Colour Value Function
S1 Fuse Blue 15 Intercooler fan, aircon compressor magnetic clutch
S2 Fuse Red 10 Fuel pump
S3 Fuse Blue 15 Injectors, MEG
S4 Fuse Red 10 Tank vent valve, oxygen sensor
P Relay - - Electric fuel pump
Q Relay - - Automated manual transmission
R Relay - - Main relay
S Relay - - Intercooler fan
T Relay - - Starter motor
U Relay - - Aircon compressor magnetic clutch relay

 

Diesel
Location Component Colour Value Function
S1 Fuse Blue 15 Intercooler fan, aircon compressor magnetic clutch
S2 Fuse Red 10 Fuel pump
S3 Fuse Blue 15 Injectors, electrical cut off, pressure valve
S4 Fuse Red 10 Glow time control
P Relay - - Electric fuel pump
Q Relay - - Automated manual transmission
R Relay - - Main relay
S Relay - - Intercooler fan
T Relay - - Starter motor
U Relay - - Aircon compressor magnetic clutch relay

Wiring

The engine electrical centre has three wiring connectors. Each connector incorporates different key-ways which prevents connectors from being pushed back into incorrect sockets.

H-LS I Wire Size Wire Colour Function
1 1.5 Black/Pink Fuel pump relay control (from pin 97 on MEG)
2 1.5 Black/Red Fuel pump
3 2.5 Red/Blue Constant Live (from front fuse box)
4 2.5 Red/Blue Constant Live (from front fuse box)
5 0.35 Blue Automatic transmission relay control (from pin 111 on MEG)
6 2.5 Black/White Supply voltage transmission 1 (to pin 117 on MEG)
7 2.5 Blue/Pink Supply voltage transmission 2 (to pin 115 on MEG and SE drive)
H-LS II Wire Size Wire Colour Function
1 1.0 Green Charcoal shut off valve (not on petrol engines)
2 0.35 Yellow/White Intercooler fan relay control (from pin 105 on MEG)
3 0.35 Green/Blue Aircon compressor relay (from pin 113 on MEG)
4 2.5 Red/Green Switched live signal from front fuse box
5 0.35 Yellow Starter relay control (from pin 112 on MEG)
6 2.5 Red Constant live from battery
7 0.5 Brown Ground
8 1.5 Black/Yellow Power supply to MEG (pin 119 on MEG)
M-LS Wire Size Wire Colour Function
1 2.5 3x White Ignition coil packs
2 1.5 Red & 2x Blue Fuel injectors
3 1.5 Blue Aircon compressor
4 - - -
5 2.5 Blue Engine starter motor (relay in motor)
6 1.5 Yellow Intercooler fan
7 1.5 White Lambda Sensor Heaters & Cycle Valve

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