Grand Caravan on 2001 ignition failure

Good evening, I have a problem with my truck, this fault is not always presented, but when you go from the key, the entire board is turned on, but it does not go, it does not take it, I have to start it from the Ignition relay, it sometimes lasts weeks starting well, but sometimes it lasts days without being able to turn it from the key, they already reviewed it in the agency and the fault does not come out, I thank you if you can help me

You checked the contact sheet, back a kind of ignition module can be giving problems if it works, the system is fine then

Hello good day:
If we have reviewed the module that is behind the ignition, I think it would be the last one that we have not done, change the switch on, according to I understand, if you send the signal to the relay box, and from there the relays if they send the signal to the march, the most strange thing is that as I say, this fault does not always happen, even so I continue to investigate what it can be
. More orientation ..

The starter engine already checked it, you had a maintenance, to rule it out.

In this truck the earth signal for the gear relay leaves the computer of pin 31 of the Hizquierdo connector by running with key to Everas having an earth signal without that signal will never start your truck