Daughter in law called with her 2013 Hyundai Elantra making a strange buzzing noise. Opened the hood, started it up, and buzzing sound coming from the fuse panel. Opened it up and it was the coolant fan relay. Fan seemed to be turning, but relay was buzzing a lot.
Swapped relays with another position, but the coolant fan relay kept buzzing. Pulled the relay out, and the two coil pins on the relay socket (85 and 86) had 12v and approx 4volts on them. The approx 4 volts was fluctuating between 3-5v.
Grabbed my OBD scanner, and found 2 pending codes: P2101 throttle control motor circuit range and P0620 generator control circuit.
Seemed in my mind that all 3 of these issues (2 codes plus the relay issue) were tied back to the PCM.
Removed the connectors on the the PCM, and sure enough, found water inside one of the connectors. Used an air compressor to blow out any moisture from the connector and the PCM pin socket. Reconnected and all symptoms resolved.
I put some extra dielectric grease around the connector boot/seal to hopefully prevent any future issues.
Can anyone recommend anything I can spray on the connector pins to prevent or stop any corrosion? Should I try for a bit of dielectric grease right on the PCM pins?
Swapped relays with another position, but the coolant fan relay kept buzzing. Pulled the relay out, and the two coil pins on the relay socket (85 and 86) had 12v and approx 4volts on them. The approx 4 volts was fluctuating between 3-5v.
Grabbed my OBD scanner, and found 2 pending codes: P2101 throttle control motor circuit range and P0620 generator control circuit.
Seemed in my mind that all 3 of these issues (2 codes plus the relay issue) were tied back to the PCM.
Removed the connectors on the the PCM, and sure enough, found water inside one of the connectors. Used an air compressor to blow out any moisture from the connector and the PCM pin socket. Reconnected and all symptoms resolved.
I put some extra dielectric grease around the connector boot/seal to hopefully prevent any future issues.
Can anyone recommend anything I can spray on the connector pins to prevent or stop any corrosion? Should I try for a bit of dielectric grease right on the PCM pins?