Plug'n'play was a nice idea, but connectors are harder to find. A new ECU and a new loom to suit is easier. Land Rover made life good for us and used injector connectors on most everything, so hook up is easy - just needed to fit the MAT sensor to the plenum.
Pin mapping:
| Function | VEMS ECU pin | Wire Colour | Comments |
| Power | |||
| Vbatt | EC36-25 | Red | |
| Ground | EC36-26 | Black | Direct to battery for lowest noise |
| Power Ground | EC36-21 EC36-32 EC36-5 | Black | Good connections! |
| Inputs | |||
| Trigger | EC36-27 | White | Shielded, see notes below |
| TPS | EC36-1 | Green | |
| TPS Vref | EC36-28 | Red | |
| TPS Gnd | EC36-5 | Yellow | |
| Coolant temperature | EC36-14 | Blue | |
| Manifold air temp | EC36-2 | Grey | |
| Outputs | |||
| Fuel pump relay -ve | EC36-15 | Orange | P259_5 |
| Cooling fan relay -ve | EC36-4 | Green | P259_0 |
| Injector 1 | EC36-7 | Black | |
| Injector 2 | EC36-19 | Black | |
| Injector 3 | EC36-8 | Black | |
| Injector 4 | EC36-20 | Black | |
| Injector 5 | EC36-9 | Black | |
| Injector 6 | EC36-18 | Black | |
| Injector 7 | EC36-6 | Black | |
| Injector 8 | EC36-17 | Black | |
| Idle stepper A | EC18-4 | ||
| Idle stepper B | EC18-10 | ||
| Idle stepper C | EC18-5 | ||
| Idle stepper D | EC18-11 | ||
| WBO2 | |||
| Nernst | EC36-13 | Black | Oops, should have been shielded |
| Pump + | EC18-9 | Red | |
| Pump - | EC18-7 | Yellow | |
| Heater + | - | Grey | to fuse block |
| Heater - | EC18-18 | White | |
| Comms | |||
| RS232 rx | EC18- | Shielded | |
| RS232 tx | EC18- | Shielded | |
| RS232 gnd | EC18- | Shielded | |
The new loom is constructed from Automotive-spec Cross-linked Polyethelene wire (-40 to 125 degrees centigrade) and Military-spec Tefzel wire (-65 to 150 degrees centigrade). Fuses and relays are automotive, for easy replacement if and when required.
- SAE-J1128 TXL cross-linked polyethelene wire for all except the following:
- MIL-27500 shielded 1 conductor Tefzel for the trigger
and WBO2 nernst signals. - MIL-27500 shielded 3 conductor Tefzel for the serial communication cable.
- MIL-27500 shielded 1 conductor Tefzel for the trigger
Trigger notes
Given that the Mallory is a multi-spark unit, we don't want to read from the coil. We'll use the 12V square wave signal from the Mallory ignition tach output. What's the best way to cut this down to a 5V squarewave that will work with the ECU using the Hall configuration? Should we use an MS-esque opto-coupler externally?
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