Wiring problem after wiring "repair"

[Rawze]

ALL of the sensors supply and inputs to the ecm itself are +5 volts, not +12volts. If some complete morons wired the ecm coolant switch or other inputs into the ecm to +12volts,.. then they very well can cause damage to the ecm and/or other sensors connected to that same circuit.

The A/C high pressure switch for a specific vehicle however, .. I cannot answer for, as it is not typically connected to the ecm directly.

Register your engine ser# on quickserv.com.. and you can get access to the wiring diagram for the ecm.