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I received my repaired ECM back from Autocomputer Specialist with a note not to hook it back up until a find the short to ground. I started looking at known problem areas. Once I got around to testing the DTC P0382: INTAKE AIR HEATER RELAY #2 CONTROL CIRCUIT I hit a snag.

 

From instruction item 3 " If resistance is 1000 ohms or greater, go to next step. If resistance is less than 1000 ohms, repair short to ground in Orange/Black wire between ECM and intake air heater relay No. 2." On my sweep Ohm meter set to the 10X scale I am reading 17 or 170 ohms. Without tearing all the wrapping off the wiring harness and looking for a short to ground does anyone have any suggestions on what to look for.

 

I also checked the INTAKE AIR HEATER RELAY #1 CONTROL CIRCUIT connector at the ECM plug, following the same test and got the same reading on my Ohm meter.

 

Any suggestions on a way to clean the holes/contacts at the ECM plug.

I also checked and cleaned a lot of grounding locations.

 

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I received my repaired ECM back from Autocomputer Specialist with a note not to hook it back up until a find the short to ground. I started looking at known problem areas. Once I got around to testing the DTC P0382: INTAKE AIR HEATER RELAY #2 CONTROL CIRCUIT I hit a snag.

 

From instruction item 3 " If resistance is 1000 ohms or greater, go to next step. If resistance is less than 1000 ohms, repair short to ground in Orange/Black wire between ECM and intake air heater relay No. 2." On my sweep Ohm meter set to the 10X scale I am reading 17 or 170 ohms. Without tearing all the wrapping off the wiring harness and looking for a short to ground does anyone have any suggestions on what to look for.

 

I also checked the INTAKE AIR HEATER RELAY #1 CONTROL CIRCUIT connector at the ECM plug, following the same test and got the same reading on my Ohm meter.

 

Any suggestions on a way to clean the holes/contacts at the ECM plug.

I also checked and cleaned a lot of grounding locations.

 

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54 minutes ago, RAD said:

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Any suggestions on a way to clean the holes/contacts at the ECM plug.

I also checked and cleaned a lot of grounding locations.

 

The ECM and PCM connectors should be dressed with this product. Any multi-pin connector with delicate access should be messaged with this product prior to reassembly.

 

Any "weather-boot" style connector should be gently cleaned and then with a Q-tip gently swab your boots with Electronic Silicon grease prior to "squishing" the mated pair back together. 

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I had a similar problem with a shorted wire, it only appeared when I started my truck, I had determined it was the alternator control line from the pcm to the alternator. I would start the engine and test the wire, but it was ok, but the alternator line had sensed a short and shut down.

It turned out to be the wire loom routed under the oil dipstick tube, it rubbed through to the wire shorting it to ground, but only when the engine shifted from the motion of starting, it took me a while to figure it out.

I connected my volt meter to the suspected wire and moved all the wire loom cables around until I found the one that changed the status of the wire to ground.

You may try shifting/moving the wire looms to look for a change, and hopefully you can locate it.

 

Brian

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