My Dad's caravan with the 3.3L has been setting P0404, P0405, P0403, and P0406 codes. I know that bad EGR valves are common on these vehicles.

However, I attempted to test the wiring and did not get the results I was expecting.

The harness has 5 wires. Pin 2 is the 5V supply, 3 is the sensor ground, and 4 is the ground. With the Key On and Engine Off, I tested the voltage from 2 to battery ground and got 5V. Within the harness, I tested 2 to 4 and got 4.1V. 2 to 3 was 2.5V. I was expecting 5V for each of these.

Am I doing something wrong? Misinterpreting the results? Or is there a problem with the wiring.

Thanks,
Eric

 

Welcome to DF
You have too many EGR codes, one is for voltage to high or too low and performance. Clear the codes and see which ones come back. I have PDF files for all the codes. If you want them, just post or send a pm with your email addres.

 

Thanks for responding.

When I first scanned the van, it had P0404 and P0405 set. I cleared the codes.

After I checked the voltages at the harness, the MIL came back on and P0403 and P0406 were set. I assumed these were set when I unplugged the harness, so I cleared the codes. However, the MIL came back on immediately and the P0403 and P0406 codes were set again.

 

Send me your email address so i can send you the pdf files that the dealer use.This may help you finding the problem.

 

I too had the same 4 codes on my 2006 Dodge Caravan 3.3. I changed the EGR valve and the Check engine light returned almost instantly. Checking the codes again, it returned with just the P0405 code. The tech tested the voltage and said it was 4v.

 

I have gotten bad valves before. Very rarely is it more than the valve.

 

just a story...

wifee has a 2006 GC... I was getting a code indicating the EGR valve, but forgot what it was, it's been a while

I kept meaning to just replace the valve, but put it off...

then the check lite and code went away...hasn't been back since! (probably just jinxed myself there...)

someone told me in the OLDER EGR valves, the tube would just get clogged with carbon and all u had to do was clean or blow out the tube... but he said that was pre-2000.... is it possible that newer ones could develope this?

 

I'm having the same issue. I just replaced my egr and within a 100 feet, light came back on. P0405. Checked connections, reset the code, went for another drive and light did not come back on. Van is still running rough at lower speeds though. RPM's are dancing between 200-400 rpm when doing between 20-40mph. When at 60 it seems to run fine.

Any ideas why it's still running rough? Would a clogged tube do this? Or will it smarten up on it's own?

Thanks.

 

Some reading material>>>

 

I spent 20 minutes looking for that information last night searching through forums and couldn't find that. lol.

I greatly appreciate the help and after disconnecting the neg cable it runs perfect.

Thanks again.