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Fault Code: 434
Supply voltage fell below (+) 6.2 VDC for a fraction of a second, or the electronic control module (ECM) was not allowed to power down correctly (retain battery voltage for 30 seconds after key-off).
The ECM receives constant voltage from the batteries through the unswitched battery wires that are connected directly to the positive (+) battery post. There are three in-line 7.5-amp fuses and one 20-amp fuse in the unswitched battery wires to protect the engine harness from overheating. The ECM receives switched battery input through the vehicle keyswitch wire, when the vehicle keyswitch is turned on
Make sure that ECM unswitched power is coming from the batteries and not the starter. Check for low voltage during cranking. Low voltage during cranking can cause the ECM power supply to drop below specifications and log Fault Code 434.
Corrupted voltage (short interruptions or spikes that may only be seen with an oscilloscope) on keyswitch line can cause this fault. If the voltage at pin 5 of engine connector is measured as negative with oscilloscope at key-off, Fault Code 434 can be logged.
A failure with the ECM can also cause this. Try a test ECM for the same vehiclenof you have one.
You can also shake the harness while you the vehicle is running to see if the vehicle shuts down.