Run fault PID 90131 bluescreen crash

Hello,

I am currently working on a machine that uses an IQAN system with an MD4. For some context: it’s a mobile hydraulic machine driven by a diesel engine. I’m running into an issue that I haven’t been able to pinpoint to a specific cause, and I’m wondering if anyone recognizes this error code or has ideas on what I could try next.

The error code I get is:

Run fault PID 90131 TID 14 Signal 11 Code 0

The situation is as follows. When I start the machine, everything initializes fine. The whole IQAN system comes up normally, the UI works, and I can operate the control system without any issues. When I give the signal to start the engine, it works in two steps:

First, the engine ECU is powered up. Then the ECU sends an OK signal back, after which I need to trigger the start again to actually crank the engine.

The ECU and the IQAN system communicate over CAN. However, as soon as I give the first start signal and the ECU powers up, the MD4 immediately goes into a blue screen and completely locks up. Nothing responds anymore, and I can’t recover from the error without completely disconnecting the system and doing a full reset.

As far as I can see, there’s nothing useful written in the logs that I can trace back to the blue screen—only the information shown on the display itself.

I’ve been trying to diagnose this for a while now, but I’m not sure what could be causing the fault in the first place. The only thing I could find online was a post mentioning CAN bus overload, but I don’t really see how that would apply here.

At this point I’m mainly looking for ideas on what could cause this error, or where I should start with further diagnosis. Any ideas are welcome.