Intermittent Code 65 EGR3 error. I have also seen an intermittent Code 26 occur as well, but 65 and 26 never
occur at the same time, and Code 26 gives no indication of which QDM sets the error...but I can guess.
1. Removed, disassembled and cleaned EGR valve. Checked coil resistance. All check good (see pic below for readings). Tested each coil for solid pick / drop with 12V. All coils pick solidly with a snap and release immediately upon ground drop.
2. Ensured connector pins at valve and wire connectors were clean and tight.
3. Reinstalled valve, reset code, and drove for a couple of weeks before seeing another intermittent 65-3. Also saw a couple of 26'* between the 65 setting the SES.
Determined to find the source, I once again removed and checked the valve. Resistance readings are indicated in the pic of the FSM page above. The valve looked clean as expected, and again, tested AOK with 12V applied. Deciding the issue is upstream from the EGR I got out the ESM and traced the wiring back to the ECM. Here are today'* results:
1. With key on engine off I checked the resistance at each of the EGR valve pins through the ECM to ground. Pics of readings:
As you can see, the line with the lowest value is EGR3
, which is the one throwing the 65'*. Coincidence? I think not...
I wanted to make sure I was not dealing with a wire issue, so I removed BATT (-), and unplugged the connector at the ECM and checked resistance at C1C2 which gave a reading of .2Ω, I checked EGR 2/3 and got similar readings, which tell me all of the wiring to the ECM is good.
At this point I am now convinced that the problem lies within the ECM.
So onto my request: Is there anyone here that can check the resistance values of the EGR lines at the EGR connector, between the connector and ground (as shown above)
, with the KOEO? I would expect to see all 3 values identical.
The EGR I have is this one:
I would really appreciate if anyone would be willing to assist with getting those resistance readings for me...it'* always helpful to have a non failing system to compare numbers with.
Thanks for taking the time to read!