The Rover V8 has a fairly simple EFI harness that maps readily to the VEMS ECU. There were two ECUs used on the hotwire systems, the 14CU and the 14CUX, each with slightly different pin-out. We've got the 14CUX to play with here.
1990 Hotwire diagram:
Should we be using the 88/89 diagram instead?
Trigger signal - channel A, 1V per segment:
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) | 2.2V spike, so 733 Ohm Rext is needed |
| 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 | EC36-5 | Green | P259_0 |
| Injector 1 | EC36-7 | ||
| Injector 2 | EC36-19 | ||
| Injector 3 | EC36-8 | ||
| Injector 4 | EC36-20 | ||
| Injector 5 | EC36-9 | ||
| Injector 6 | EC36-18 | ||
| Injector 7 | EC36-6 | ||
| Injector 8 | EC36-17 | ||
| Idle stepper A | EC18-4 | ||
| Idle stepper B | EC18-10 | ||
| Idle stepper C | EC18-5 | ||
| Idle stepper D | EC18-11 | ||
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.
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