rnettleship
Member
I decided to troubleshoot the P0455 code from the rear of the vehicle forward. I pulled the canister vent solenoid and it bench tested fine using a battery charger as the power supply. It sealed completely when 12v was applied. I then turned the engine on and tested the plug and got 12+ volts across the 2 leads.
This is where it gets strange...
I plug the solenoid in and nothing happens. I figure it must be the leads in the plug being spread too wide so I mess around with about a dozen times and nothing makes the solenoid work so I decide to cut the plug out of the harness with pig tails and bench test. Connect the leads to my batter charger and the solenoid works fine.
Re test the wires in the harness and get 12v.
Connect plug to harness and nothing. With everything plugged in I test across the leads and get 0v. Unplug the solenoid and get 12v.
If I separate the ground lead from the harness and simply ground to the frame the solenoid works.
My understanding is the vent solenoid is triggered by the ground so I can't just ground to the frame or the vent will be closed 100% of the time the key is turned on.
So..... Seems like a bad/weak ground to me. Any other ideas out there? I guess my next step is to trace the wires back to connectors and see if I have corrosion as the cause.
This is where it gets strange...
I plug the solenoid in and nothing happens. I figure it must be the leads in the plug being spread too wide so I mess around with about a dozen times and nothing makes the solenoid work so I decide to cut the plug out of the harness with pig tails and bench test. Connect the leads to my batter charger and the solenoid works fine.
Re test the wires in the harness and get 12v.
Connect plug to harness and nothing. With everything plugged in I test across the leads and get 0v. Unplug the solenoid and get 12v.
If I separate the ground lead from the harness and simply ground to the frame the solenoid works.
My understanding is the vent solenoid is triggered by the ground so I can't just ground to the frame or the vent will be closed 100% of the time the key is turned on.
So..... Seems like a bad/weak ground to me. Any other ideas out there? I guess my next step is to trace the wires back to connectors and see if I have corrosion as the cause.