This job came to us as a non start. Diagnostics test revealed a heap of fault codes.

0123 Injector 1 output drive too long
0124 Injector 2 output drive too long
0125 Injector 3 output drive too long
0126 Injector 4 output drive too long
0127 Injector 5 output drive too long

0128 Topside switch failure. Post injection fault

0129 Injector 1 output drive peak too short
0130 Injector 2 output drive peak too short
0131 Injector 3 output drive peak too short
0132 Injector 4 output drive peak too short
0133 Injector 5 output drive peak too short

0135 Injector 1 output drive open circuit
0136 Injector 2 output drive open circuit
0137 Injector 3 output drive open circuit
0138 Injector 4 output drive open circuit

There is some signs of very slight oil ingress into the ECU plug and the plug from the injector wiring loom to engine wiring loom. These were both extensively cleaned.

I checked the injector resistance at the ECU plug and four of them measured 1.3 ohms but No. 2 injector reads 1.6 ohms.

I sent the ECU away for testing and it was confirmed faulty and repaired.

On refitting it, the engine now does try to start but sounds like its only firing on 1 cylinder. I further code read now shows the following.

0129 Injector 1 Output drive peak charge too small.
0131 Injector 3 Output drive peak charge too small.
0132 Injector 4 Output drive peak charge too small.
0133 Injector 5 Output drive peak charge too small.

I figure that I should replace the injector wiring loom through the head but was wondering if you guys could confirm that a faulty loom would cause these codes to be logged. Its interesting to note that it doesn't log a code with injector 2.