Hi. Coulds you please help me with a few pointers regarding a Chev Spark 0.8 that's not starting.

Question

This vehicle has the following trouble codes. P0261,P0264,P0267. All related to injector control circuit voltage low. When crancking the vehicle it sounds like it want to start but as soon as you let go of the key it dies. We checked for spark,fuel which we get. We checked for power to the injectors which we get but it seems that we don\'t get a injector pulse. Could you please give me some pointers where to check. We also checked the basics like fuses, fuel system relay wiring connections.

Many Thanks
Regards
JP Venter