A few weeks back I changed my mates boost control solenoid to cure an overboosting issue and all seemed great. Now it has started playing up again, it is lumpy and returning P1E30. It is a 2005 TD4.

The fault will not clear so is obviously permanent. When I first plugged in the reader there were 5 faults and all cleared except the P1E30. I took it for a drive and no other faults returned but P1E30 will not clear.

The strange thing is that the fault will not clear with the engine stopped. If it was a boost issue (under or over) or stuck turbo vains etc. the ECU wouldn't know until the engine started so I am guessing it must be the new boost control solenoid or a wiring issue to the solenoid. Does anyone know what resistance the solenoid coil should be and which 2 pins of the ECU run the solenoid?

Any other ideas? Thanks

Have a look at this

Thanks Madmustang, mine isn't a leak anywhere because it won't clear with the engine stopped. If it cleared and then returned with an engine start then a leak or stuck veins would be where to look but this has a static fault. I am going to try and find the old boost control valve to compare resistance and check the wiring later. It is all good fun.....

Just a quick update, it is fixed and here is what I learnt that will hopefully help someone else.

The boost control solenoid has it's resistance checked when the key is turned on and if it is open circuit (or a broken wire like mine) the P1E30 error code is generated. The solenoid is run but 2 wires, red with a white stripe takes the 12v to the solenoid and brown with a white stripe is the control back to the ECU. The wiring comes up the back of the engine past the turbo vent filter and connects into the loom just behind the filler cap and next to the MAF. Without the engine running and with the plug disconnected I got 8.95v across the 2 pins (with wiring fixed). I can't tell you what the resistance of the solenoid coil should be because I would have had to remove it to test but perhaps someone else can fill in that blank. All the best and good luck....