Scouser102
New Member
- Joined
- July 6, 2017
- Messages
- 7
- Reaction score
- 4
- Year, Model & Trim Level
- 2010 Explorer XLT 4X4
i decided to join and post what I found when diagnosing a P0403, P0443 error.
2010 Explorer XLT 4X4
When these codes first showed up I could reset and they would go away for maybe a day. But this interval slowly got shorter until they were immediate. So I ordered an EGR online and changed it. No difference.
I ordered a Bluetooth OBD unit that was ELM compliant. Having 3 fords it can always be useful and I downloaded ForScan on my laptop.
Ran an engine running self test and there were the codes plus the O2 heater malfunction codes.
I ran an ohm test on the wiring and it all looked just fine.
Took it to the dealer who said PCM is Bad.
So brought it home. Took the PCM out and mailed it off for repair. SIA Electronics in Illinois.
They called me and said no problem found. Mailed it back and charged $85 testing fee.
So I put it back in and no codes.
2,000 miles later the codes came back.
Hooked my laptop back up and watched the EGR, EVAP, MAP and Fuel Rail pressure.
As I moved the wires around the EGR I could see the EGR going into Fault and back to normal. So moving just the part of the wire at the EGR connector I could see the fault. Theory now, bad connector. So went to the salvage yard and got one.
After wiring it in I could no longer move the wires and see the fault appear and disappear but the codes where still there.
Dealer now telling me to replace the entire wiring harness. This just didn't add up so I played some more.
Moving a wire at the PCM I could now generate the fault. In fact I could generate 3 faults by moving the wires.
So the entire engine is clean. It was detailed by a local detail shop. All the surfaces were also slick. So I called and asked what they used. It was a Silicon based engine dressing.
Knowing Silicon is a semi conductor that insulates at low temp and can conduct at high temp and also knowing it can travel easily down wires it was time to clean.
After a full clean and using electrical contact cleaner. No change.
Moving wires still changes sensor outputs. Connectors are good, tight and no corrosion.
Thinking the worst and contemplating a wiring harness change I got a bowl of hot water and Dawn dish soap. I put the harness PCM side connector in the bowl and let it soak.
Scrubbed it with a brush, soaked and repeated for 10 minutes. Rinsed with clean destilled water and left it to dry for 4 hours.
NO MORE CODES, moving wires around and no effect. ITS GONE!!!!!!
2 months of this and fixed with Dawn Dish Soap and Hot Water.
Now to find a way to clean the Silicon off the rest of the engine so it doesn't come back.
2010 Explorer XLT 4X4
When these codes first showed up I could reset and they would go away for maybe a day. But this interval slowly got shorter until they were immediate. So I ordered an EGR online and changed it. No difference.
I ordered a Bluetooth OBD unit that was ELM compliant. Having 3 fords it can always be useful and I downloaded ForScan on my laptop.
Ran an engine running self test and there were the codes plus the O2 heater malfunction codes.
I ran an ohm test on the wiring and it all looked just fine.
Took it to the dealer who said PCM is Bad.
So brought it home. Took the PCM out and mailed it off for repair. SIA Electronics in Illinois.
They called me and said no problem found. Mailed it back and charged $85 testing fee.
So I put it back in and no codes.
2,000 miles later the codes came back.
Hooked my laptop back up and watched the EGR, EVAP, MAP and Fuel Rail pressure.
As I moved the wires around the EGR I could see the EGR going into Fault and back to normal. So moving just the part of the wire at the EGR connector I could see the fault. Theory now, bad connector. So went to the salvage yard and got one.
After wiring it in I could no longer move the wires and see the fault appear and disappear but the codes where still there.
Dealer now telling me to replace the entire wiring harness. This just didn't add up so I played some more.
Moving a wire at the PCM I could now generate the fault. In fact I could generate 3 faults by moving the wires.
So the entire engine is clean. It was detailed by a local detail shop. All the surfaces were also slick. So I called and asked what they used. It was a Silicon based engine dressing.
Knowing Silicon is a semi conductor that insulates at low temp and can conduct at high temp and also knowing it can travel easily down wires it was time to clean.
After a full clean and using electrical contact cleaner. No change.
Moving wires still changes sensor outputs. Connectors are good, tight and no corrosion.
Thinking the worst and contemplating a wiring harness change I got a bowl of hot water and Dawn dish soap. I put the harness PCM side connector in the bowl and let it soak.
Scrubbed it with a brush, soaked and repeated for 10 minutes. Rinsed with clean destilled water and left it to dry for 4 hours.
NO MORE CODES, moving wires around and no effect. ITS GONE!!!!!!
2 months of this and fixed with Dawn Dish Soap and Hot Water.
Now to find a way to clean the Silicon off the rest of the engine so it doesn't come back.
