Management system Bosch EDC 16CP31 II

Unfortunately this is not fixed. After extensive road test and thinking we had fixed it the car was brought back in to us again. We did some more testing on air flow issues as this is the fault codes coming up and looking at scope traces against live readings decided to fit a MAF sensor. The signals coming from the MAF looked wrong the air temp sensor should have been a nice 5v square wave form and they just looked a bit of a mess.

So new genuine MAF sensor ordered and fitted checked the wave form again and now looked much better on the ait temp. So for another road test. I managed to get all of about 3 miles down the road and then complete engine cut. Coasted in to a layby and checked fault codes and found something completely different. All 6 injectors coming up with short circuit. Codes 2116, 2120, 2124, 2128, 2132, 2136. Cleared error memory and try to restart non starter and all fault codes returned. So recover Jeep back to the garage for further investigating.

Back in the workshop did all the usual checks on wiring loom to make sure I had not buggered anything up fitting the MAF and no everything looked ok. Out comes the scope again and hooked it up to one injector to see what was going on. Turned key over and the pigging thing fired up and ran sweet as a nut. What did surprise me though was the voltage to fire the injector was 130 volts and 10 amps. Now this was much higher than I expected was thinking its going to be 70-90 volts. So checked all injector voltages and all the same give or take a couple of volts. Is 130 volts normal on a system like this?

Also my thinking is that seeing that all injectors have there own pairs of cables that to short the lot must be an issue inside the ECU possibly the capacitor?

Before I go and dig out the ECU for repair have I missed anything. This is an intermittent fault and a right royal pain in the bum to sort. It can go 100 miles without a fault then its back again.