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  1. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    At this point, it's beyond my ability to resolve....

    At this point, it's beyond my ability to resolve. If you want to run a Scan9495 log showing the startup attempt, in .csv format, I'll see if there is anything in there that points to the problem.
  2. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    You keep mentioning the “pulse” and “spike” on...

    You keep mentioning the “pulse” and “spike” on the white wire. Have you ever actually measured the AC voltage with the engine cranking, as recommended several times?
  3. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    He already swapped out the coil. But maybe the...

    He already swapped out the coil. But maybe the new one is defective.

    Can't remember if I already posted this:

    http://shbox.com/1/coil_testing.jpg
  4. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    Still not clear in my mind.... guess old age is...

    Still not clear in my mind.... guess old age is taking it's toll. When you had the Opti off, and spun it, you got the 5V DC pulse at the Opti harness, and injectors pulsed. The proves the Opti is...
  5. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    Are you saying that when you reinstalled the...

    Are you saying that when you reinstalled the Opti, and tested for AC voltage on the white wire to pin B, there was no reading?

    If the ICM is not getting that signal on the white wire to fire the...
  6. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    Did you measure the AC voltage on the white wire...

    Did you measure the AC voltage on the white wire to pin B of the ICM connector, as suggested in previous post?
  7. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    Turn it SLOWLY. The low res circuit will produce...

    Turn it SLOWLY. The low res circuit will produce 8 pulse for one revolution of the Opti. There are 4 varying space longer pulses, alternating with 4 short pulses. The high res circuit produces...
  8. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    You will have to run a ground wire from the Opti...

    You will have to run a ground wire from the Opti case to the block.
  9. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    Shoebox’s procedure emphasizes the D pin...

    Shoebox’s procedure emphasizes the D pin resistance is measured key OFF.

    Follow up with the measurements at the ICM. The 1-4 volts AC on the white wire (pin B) is the key to determining if the...
  10. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    If you have a STOCK setup, when you put the key...

    If you have a STOCK setup, when you put the key in the lock cylinder, and they key has the correct resistance, the theft deterrent module (TDM) passes 12 volts to the starter relay (TDR) so the...
  11. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    If it cranks the engine when you turn the key to...

    If it cranks the engine when you turn the key to “start” it’s done right.
  12. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    Ask Moe to confirm he deleted it. But if the PCM...

    Ask Moe to confirm he deleted it. But if the PCM isn’t setting DTC 46 and you don’t have a TDM in the circuit, it sounds like it's been programmed out. How did you address the other part of the...
  13. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    The 94/95 F-Body LT1 control does not have the...

    The 94/95 F-Body LT1 control does not have the low oil pressure interlock. The Corvette LT1 does.

    What is the VATS issue? The PCM is looking for a 60Hz signal from the theft deterrent module...
  14. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    The PCM has 4 ground terminals. Two of them (A2,...

    The PCM has 4 ground terminals. Two of them (A2, C32) have black/white wires that connect to the same large splice, where it joins grounds from:
    - oil level sensor
    - MAF sensor
    - a single wire...
  15. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    See Shoebox’s photo of 94/95 harness. The black...

    See Shoebox’s photo of 94/95 harness. The black PCM ground has an eyelet to attach to the block as described above. It is bundled with the wire for the pass side O2 sensor, knock sensor, and purple...
  16. Thread: Pcm ground

    by Injuneer
    Replies
    52
    Views
    540

    Remind us.... what year is the PCM and harness?

    Remind us.... what year is the PCM and harness?
  17. Replies
    4
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    177

    The tach is driven based on the low resolution...

    The tach is driven based on the low resolution pulse from the Opti. The tach should move up 200-300 RPM while the engine is cranking.

    No scanner? DTC 16 for loss of Opti low res pulse does not...
  18. Replies
    4
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    158

    He indicates he is using the 94 Caprice PCM. ...

    He indicates he is using the 94 Caprice PCM.

    Shoebox has a detailed, labeled photo of a 95 F-Body harness. Doubt the Caprice is the same, but here's the link:

    http://shbox.com/1/harness.htm
  19. Replies
    24
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    668

    Was it indicating closed loop? If the PCM has...

    Was it indicating closed loop? If the PCM has lost power (battery disconnect) the LTFT's reset to 128, and stay there until it goes into closed loop. And the PCM losing power would have cleared the...
  20. Replies
    24
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    668

    As a result, is the engine running better? For...

    As a result, is the engine running better?

    For future reference:

    http://shbox.com/1/4th_gen_tech2.html#ect

    Odd you had no SES light initially, but it came on later. The code should show up...
  21. Replies
    2
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    75

    That circuit starts at the battery, passes...

    That circuit starts at the battery, passes through a fusible link, then through fuse #4 (10 amp) in the dash fuse panel, then through connector C210 to PCM pins B15 and B31. That is one of the ...
  22. Replies
    24
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    668

    93 and 94 factory F-Body Opti's were unvented. ...

    93 and 94 factory F-Body Opti's were unvented. Had problems with corrosion due to ozone generated by the high voltage discharge inside the sealed unit. The vent was added in 95 to eliminate the...
  23. Replies
    24
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    668

    There are codes that don't turn on the SES...

    There are codes that don't turn on the SES light.... e.g. DTC 16 for loss of the Opti low resolution signal. There are no OBD-1 codes that cause the SES light to flash, at least not that I have ever...
  24. Replies
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    668

    I find Scan9495 to be the most useful. Plus the...

    I find Scan9495 to be the most useful. Plus the author is a member here. Doesn’t come around much, but if you have install and setup problems, I can ask him to help. Did you buy a cable that he...
  25. Replies
    24
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    668

    eBay Opti's can be crap right out of the box. ...

    eBay Opti's can be crap right out of the box.

    Without scanning it, just a lot of guessing. Is the SES light on? What software do you plan to use to scan it?

    Does it still have a cat?
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