I just installed a brand new EGR on my neighbors Peugeot Partner II 1.6L HDI Turbo Diesel. As soon as I connected it and tried a bidi self test I got a bunch of codes. Cleared the codes, and now have a permanent P0405 EGR Circuit Low EGR Repeat Raw Signal which won't go away, even with the EGR disconnected. This code was not present prior to installing the new EGR. I could not detect any vibration or movement during the self test when placing my finger on the EGR solenoid.
This is a 5 wire EGR which I believe to be a linear EGR.
The EGR I bought is off ebay from England and is physically identical to the one it replaced. However it has a different part number, but from looking at cross references it should be compatible. I am keeping in the back of my head that the solenoid and potentiometer ( EGR position sensor ) might be wired differently.
So that's one posibility. The other things I'm considering are that there is a problem in the wiring since it's obvious that the connector has been cut off and replaced. The other possibility is the EGR is in fact wired differently and I fried something when I hooked it up.
Here's a look at the connector and it does look like it might have been rewired incorrectly:
My assumption is that the EGR should be wired internally like this:
When I used the continuity check setting on my multimeter to check the EGR I saw that Pin 1 had continuity with both pins 4 and 5 showing a resistance of about 200 Ohms, but not setting off the buzzer which I thought was strange. I got OL on all other combinations of pins.
I tested the harness side and with KOEO I have 5v on Pin 1, ground on pins 2,3 and 5 and nothing on pin 4. So I'm assuming Pin 4 should be B+.
With the key off, the only thing I get is a permanent ground on pin 5.
This makes me think pins 2 and 3 are sensor ground and signal. It also tells me the solenoid is probably power side switched and there will only be power on Pin 4 when the ECU is trying to activate the solenoid. This is opposite the above illustration which shows a ground side switched solenoid. The only other illustration of a linear EGR I've found also shows it being ground side switched.
Another possibility is that the permanent ground is the sensor ground, and that pin 4 is supposed to have power and just doesn't for some reason. That would make more sense based on the illustrations I've seen.
Those continuity readings on the EGR just have me really confused and I'm feeling like my brain is about to explode. Too many potential problems, and all just to help a neighbor. Any advice?