1. Check the ecu connector for bent pins and refit the connector.
2, Check the green wire in the square plug by the ecu. As described in better detail below.
FAO Andy K
3. Try/get another ecu if cheap etc. ?
4. If desperate bodge it. Cut the green wire on the square connector by the ecu.
Connect to the foam covered cable (car loom to rev counter and 4x4 ecu) green wire to the ignition amp spare pin under the bonnet, This is described in one of the other threads linked to.