Is My PCM dead??? - Page 4 - Chevy Impala SS Forum
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post #31 of 35 (permalink) Old 10-12-2016, 11:17 AM
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Originally Posted by Razor96ss View Post
I'm also having problems my car want sift out of 2nd gear and my fans want turn on . I check the fan relays and the fans there working fine . I hooked the fans up to a switch . sorry dont mean to jack your thread


Not high jacked- what have you done to diagnose the problem? Checked pcm?


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post #32 of 35 (permalink) Old 10-12-2016, 12:15 PM
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Not high jacked- what have you done to diagnose the problem? Checked pcm?


Sent from my Commodore64, excuse typos & brevity.


Nothing really. What should I be checking?! are there any special tools I need ???


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post #33 of 35 (permalink) Old 10-12-2016, 05:09 PM
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Nothing really. What should I be checking?! are there any special tools I need ???


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Special tools that cost a bunch of money. But you can find what need here, you just need to search. The members who know allot are old'n tired so they may take a while to respond or may not even respond at all.

So, I'll help with what i know- use the search feature on this forum. Search your problem 'transmission not shifting'

For the scan tool, don't go buy anything new. It may not communicate with our car (guess how I know)Try making one yourself. If you suck at making ****, buy the cable & software. Google tunercat.

I've made a cable and downloaded the software but still cannot communicate with the pcm. I think my pcm is bad. I've checked the wiring and everything seems good so I ordered a pcm today.

Bad wiring seems to be the culprit with PCM problems. The new PCM should be here in a few days & we'll know if i tossed money out of the window or not.


Sent from my Commodore64, excuse typos & brevity.

'A determined soul will do more with a rusty monkey wrench than a loafer will accomplish with all the tools in a machine shop.' -Robert Hughes


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post #34 of 35 (permalink) Old 10-14-2016, 03:15 PM
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I patiently waited for the cables from china to arrive. Per the instructions in rocko350's sig, I made the scanner wire. I tried both eehack and scan9495. Neither worked. It took me a few hours, and 3 laptops (thank god I had 2 old toughbooks running XP sp2 still just laying around) and messing with the drivers to get the cable to install correctly. I bricked the cable on the first toughbook. Im not even sure if I got the cable install right.



I know the connections are good. But what I don't know is if the chip in the USB is good or not.



I've already checked the wiring from the plug under the dash to the PCM, they are good. I checked every 3 wire component connector (except the O2 sensors) from the PCM to the component and they are good- the way in which I tested connectivity was using my meter, setting it to 'beep' and making the connection, listening for a steady beep. The resistance was less than 2, which should be acceptable.



Right now, I don't know if I should hit PCMforless or try the cable from tuneracat.



The car runs. Using the older scan tool and the innovacrap causes the fans to come on so I know the PCM works. The question is if its good or not and I'm not experienced at all in this department.



Can I get some guidance


New (reman) pcm arrived today. Swapped it out. Same problem... Really pissed& discouraged.

This is exactly what the FSM talks/warns about, replacing good parts for no reason.

So either the China cable I made was bad, or I messed the cable up, or as others have posted- self made usb stuff usual just does not work right, or I didn't catch a bad wire when I checked at the DL to the pcm.

Going back to my original problem, the stumble/miss. When I got the car, the seller said he just replaced the EGR. I drove it from North Carolina to Maryland and it ran fine until a few days later.

Where do I go from here- I'm thinking a professionally made cable. This should allow me to see the trouble codes so I can know where to go.


Sent from my Commodore64, excuse typos & brevity.

'A determined soul will do more with a rusty monkey wrench than a loafer will accomplish with all the tools in a machine shop.' -Robert Hughes


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post #35 of 35 (permalink) Old 10-20-2016, 04:14 PM
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The new cable arrived and worked. Starting a new thread.

'A determined soul will do more with a rusty monkey wrench than a loafer will accomplish with all the tools in a machine shop.' -Robert Hughes


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