Has anyone had an issue with ECM pins being loose causing intermittent issues? Any ideas how to refresh or update the pins in the connectors?

I had an O2 heater circuit issue I decided to tackle. P0155 pending(No CEL), bought 2 new Bosch O2s, installed and now have O2 heater circuit and No Activity codes P0155, P0135, P0154, P0134, but Torque was still reading O2 voltages bouncing around 0-1v. After spending some time checking voltages, grounds, and continuity through all the wires and connectors between the Sensors and the ECM, and determining that everything checked out good, I put it back together and had a flat line 0.4v graph for the Passenger side.

Rechecked the wiring on the passenger side and everything checked out, still no reading though. Slept on it and thought I'd reach under the dash to make sure I plugged the wires back in the ECM *with it running and torque open* and as soon as I touched the wires I got normal readings on the Passenger O2 sensor.

 

Does anyone at least know what kind of plugs/pins the ecm connector is so I can try to replace them?

 

Your best bet is try a good electrical contact cleaner,and let everything sit overnight. A lot of the time it is just dirty connections. You could pull the ECU and crack it open and check for corrosion on the inside.

Another option is electrical conductive grease on the connectors,after cleaning but it tends to be hard to find and apply you can not just slap it on

The big thing here disconnect the battery then hit the connector and ecu connections.

 

Found the answers I was looking for.

Connector c0635 has these numbers stamped on it.
AMP 967285
AMP 965488-1 Black
AMP 965488-2 Gray

 

Watching this. Were you able to identify a loose pin? I have a intermittent P0161 code. The O2 sensors are fine and the wires test to be ok. I am thinking maybe a loose pin and need to do the wiggle wire ttest.

 

My thought right now is me or someone used a needle to check the wiring that opened up the female side of the pin.
Right now I'm getting a constant pending p0154, I'm going to swap sensors and see if the problem changes to confirm it's the loose ecu pin. If I get the same code I'll order some pins.

 

Been beating my head following the advice of swapping sensors and replacing them... Even replaced the rattling Passenger side cat(driver side too but not rattling) which I think went bad because of this issue. Bought an oscilloscope to help see what the sensors are doing without the help of the ECM. Swapped the harness left to right with extensions and it seemed like it was always bank 2 that was showing no activity (default 0.4xxV) in the ECM no matter what I did. About ready to give up and replace the ECM I took one last second to back probe the Upstream O2 grounds at the ECM with the oscilloscope and to no surprise they were both grounded. Not thinking anything of it I glanced at the OBD reader I had showing the O2 graphs and both sides were dancing High and Low like they are supposed to....


Bank 2 O2 signal flat 0.4xxV


Grounds happily grounded from the ECM


Looks like I was right and it was a loose connection at the ECM.. Cleared codes, Reset Adaptions again and drove it 20 miles with the back probes still in place putting pressure on the connector to the pin, it's not thrown a code, and the graphs continue their happy dance.

 

*it sure would be nice if I could update the thread title..

[SOLVED]

 

Thanks for the update Sandman. Could you elaborate on how back probing the grounds is done? I'm not a electrical guru but get most of it. This sounds very similar to my P0161 code that shows randomly.

 

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