Not writing calibration
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 190
Likes: 6
Not writing calibration Hey guys I was trying to figure out why my pcm is not writing the calibration. It has failed in red letters pop up. First off I have done a 5.3 4l60e c10 swap. I had a mail order tune on it first so I was in the process of dialing it in correctly by a buddy of mine using the hp tuners software. Everything went fine except it write the calibration. I checked the battery voltage. It's good. Disconnected the battery for several seconds NOTHING. I thought it might be the pcm was bad but my friend took the pcm home and hooked it up in his truck and it read. He say I may have a harness issue. Something is keeping the pcm from uploading and a chance to get her up running properly. I mean she fires up but doesn't run very long. ANY SUGGESTIONS
On The Tree
Joined: Sep 2007
Posts: 196
Likes: 0
What year 5.3? 24x or 58x??
IF your engine is 24x you need to make sure the wires in the OBD2 port are located in the correct position. OBD2 port wiring is as follows on 24x....
Pin 2 Serial Data Communication
Pin 4,5 Ground
Pin 16 Battery (B+)
58x OBD2 as follows
Pin 4,5 Ground
Pin 6 Tan/Black
Pin 14 Tan
Pin 16 Orange
IF your engine is 24x you need to make sure the wires in the OBD2 port are located in the correct position. OBD2 port wiring is as follows on 24x....
Pin 2 Serial Data Communication
Pin 4,5 Ground
Pin 16 Battery (B+)
58x OBD2 as follows
Pin 4,5 Ground
Pin 6 Tan/Black
Pin 14 Tan
Pin 16 Orange
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 190
Likes: 6
What year 5.3? 24x or 58x??
IF your engine is 24x you need to make sure the wires in the OBD2 port are located in the correct position. OBD2 port wiring is as follows on 24x....
Pin 2 Serial Data Communication
Pin 4,5 Ground
Pin 16 Battery (B+)
58x OBD2 as follows
Pin 4,5 Ground
Pin 6 Tan/Black
Pin 14 Tan
Pin 16 Orange
IF your engine is 24x you need to make sure the wires in the OBD2 port are located in the correct position. OBD2 port wiring is as follows on 24x....
Pin 2 Serial Data Communication
Pin 4,5 Ground
Pin 16 Battery (B+)
58x OBD2 as follows
Pin 4,5 Ground
Pin 6 Tan/Black
Pin 14 Tan
Pin 16 Orange
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 190
Likes: 6
Yeah my tuner said the pcm is not bricked. He even installed it in his personal vehicle and it ran. He flashed it over and over and tuned it down and it appeared to be A1
It's something in the harness he said. My truck wouldn't even run right. On my harness it could data log download but can't upload. Does anyone know a good respectable wire harness company that I can send it to to go over everything
It's something in the harness he said. My truck wouldn't even run right. On my harness it could data log download but can't upload. Does anyone know a good respectable wire harness company that I can send it to to go over everything
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Thread Starter
On The Tree
Joined: Feb 2013
Posts: 190
Likes: 6
What year 5.3? 24x or 58x??
IF your engine is 24x you need to make sure the wires in the OBD2 port are located in the correct position. OBD2 port wiring is as follows on 24x....
Pin 2 Serial Data Communication
Pin 4,5 Ground
Pin 16 Battery (B+)
58x OBD2 as follows
Pin 4,5 Ground
Pin 6 Tan/Black
Pin 14 Tan
Pin 16 Orange
IF your engine is 24x you need to make sure the wires in the OBD2 port are located in the correct position. OBD2 port wiring is as follows on 24x....
Pin 2 Serial Data Communication
Pin 4,5 Ground
Pin 16 Battery (B+)
58x OBD2 as follows
Pin 4,5 Ground
Pin 6 Tan/Black
Pin 14 Tan
Pin 16 Orange
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Verdad Gallardo Thread Starter
On The Tree
Joined: Feb 2013
Posts: 190
Likes: 6
Quick question? If the tuner is able to communicate with the pcm but is unable to upload a tune, do you guys think that the wire harness is good and maybe the problem lies with the tuner itself? I gone over the wiring diagram for the obd port and it's good. I checked it with a code scanner and it communicated back with me with a codes for generator and CEL. So in that aspect I'm good. So my problem should be with the tuner
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 190
Likes: 6
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 190
Likes: 6
I'm trying go in and make changes to tune that was already in the pcm. It will not upload. It will read and data log all day long. The thing is it was installed in a 02 Tahoe and the pcm was able to upload and run the truck with no problems
And quit using the term upload. It muddles what you are trying to do. Use read/write. That is the terminology the software uses. And in one post you say it is a 03 then you say it was installed in a 02 and worked. Be more clear of what year everything is. PCM, harness, engine.
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 190
Likes: 6
We'll 2x Ls1 I finally found out my problem. The standalone wire harness had 2 wires missing out of it. One which went to the alternator to the pcm and the 2nd one the on/off switch to the transmission. The alternator wire was the reason why the tuner could not write a file