LM7/Manual Drive By Cable P0507 code: SOLVED

[h82crash]

Here's a post from LS1Tech regarding P0507 and VSS.

"I had the same problem. I have a standalone harness with a 1999 5.3 pcm auto trans in a 1992 chevy pickup 5 speed manual. I did a smoke test and fixed my vacuum leaks intake manifold gaskets but I still got that code. Hooked up my vss to my pcm and haven't had the code since. I think since the pcm wasn't seeing speed that it was setting the code thinking car wasn't moving."

 

[cruisermatt]

Do you still have the green/purple wiring and connector on your PCM? If so just plug a VSS into it and see what happens. Like I said in a earlier post you can use anything rotational on your driveline (post transmission mainshaft) for a signal

 

[h82crash]

Yes, I have access to the input and output. Now I need to find what parts I need to generate the signal.

The P0135 returned. At least I know it is not the sensor. It must be a PCM problem. I'm done chasing these codes until I get a scanner and can see the parameters and alter the tune if necessary. I need to walk away for a bit.

 

[cruisermatt]

Yep, you could just buy HP Tuners and just delete those codes from ever occurring again. That is definitely the nuclear option.

 

[h82crash]

Back from the Overland Expo, good times. Got a OBDLink and using a scanner app. I got some crazy readings on short term fuel trims. I think I have bank one and bank two o2 sensor leads swapped at the PCM connector. I'll change those and see if it corrects the issues.

Now, the P0507. TPS seems to be reading fine. Smoke tested for vacuum leaks, none. 650 rpm idle. If I cannot find any real failure associated with P0507 fault code, then I will just turn off the MIL for it.

 

[h82crash]

P0135 solved. Although there was no audible exhaust leak at idle or quick revs, I noticed some soot around one exhaust port on each side. Installed the crappy Felpro exhaust gaskets when I first assembled. I got some oem MLS gaskets and swapped them out today. This led me to discover the v-band clamp on the driver side collector was loose. That's only about 8 inches upstream of the O2 sensor. After buttoning everything up I cleared the codes and about 30 miles of test drive with a couple stops and restarts. No Codes! Actually, the P0507 was still there. I then disabled that MIL in the tune. All good.

I just think it is strange that an exhaust leak would cause a O2 heater circuit fault code.

 

[cruisermatt]

glad you got it figured out.