C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

88' electric schematic help

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Old Feb 15, 2022 | 08:43 PM
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Default 88' electric schematic help

got an fsm from a member here. Mostly its been right on. Been trying to get the CC to work. I pulled out the IP connector and followed the test procedure.
pages 8A-34-4 as well as the following page,(table 3)?. My problem is at connector D5 (orange wire,wire to grnd.=battery). its at conn. D7? but that could be the
wire to the ECU. BTW, D7 has no power. anybody have correct Elec FSM for this? I will try to post a pic of the errant manual.

My goal is to insure theCC is getting powered. Anybody?
Thanks Always........Bob R
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Old Feb 15, 2022 | 09:41 PM
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'87 FSM & '88 both show D5 as PNK/BLK , an '89 shows D5 as ORN/BLK. An '87 FSM in 8A-34-4 shows D5 as PNK/BLK (Table 1), '88 in 8A-34-4 does show D5 as ORN (Table 1), '89 FSM 8A-34-4 shows D5 as ORN/BLK (Table 1).

D7 all 3 years LT BLU.

In '88 I believe there was a supplement to Wiring but I don't believe it mentioned any of the cavities you've mentioned.

What color wire do you actually have @ D5

I didn't understand your 'TYPED OVER NOTE' What does it say?

-----------------------------

Need a snapshot of a 'paper' FSM for 8A-34-4 and also 8A-82-10 which should be the IP Connector

@FostersPerformance I believe has an '88 'PAPER' - maybe he'll stop by! Hey @FP do you have the 'paper' Electrical Supplement also?





Bryan @Batee has much information regarding 'CRUISE' & CLUSTER

https://batee.com/pages/1984-1989-cl...ing-and-repair

Last edited by WVZR-1; Feb 15, 2022 at 11:01 PM.
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Old Feb 16, 2022 | 08:50 AM
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Here are the pages you asked for. Any other pics let me know.



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Old Feb 16, 2022 | 09:38 AM
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Im going to take it apart,again. If memory serves, I have orange in the D7 slot.
the D5 slot is different color. I would like to find the LCD fuse and trace it back
please stand by, I will take pics of my connector. I'm confused because the schematic shows
D5 orange,always hot. I do have an orange in D7. Meanwhile the schematic doesn't match my connector Arrghh!

please stand by and thanks
Bob R
PS, Yes, the trip meter,Fuel Avg. works fine
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Old Feb 16, 2022 | 12:09 PM
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If it is safe to say D5 is always hot no matter the color, then I will test again!

thanks
Bob R
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Old Feb 16, 2022 | 12:12 PM
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Originally Posted by Bobb#
If it is safe to say D5 is always hot no matter the color, then I will test again!

thanks
Bob R
What ever you find there 'D5" should certainly be B+ voltage. Anything else would be a 'surprise'.

Cruise control is actually I believe controlled in the cluster and Batee has much information. When you have the cluster in hand it might be interesting to find the GM # on your cluster to see 'IF' for sure your cluster supports K34 'Cruise Control'. I believe all clusters would have an 8 digit # starting with 2505, 2506, 2507 or 2508 maybe?

Last edited by WVZR-1; Feb 16, 2022 at 12:19 PM.
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Old Feb 16, 2022 | 06:47 PM
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Went out and tested again. what do you think?


I tried to make the test results come out as a pic. hit the link,I believe it tells the story.
Attached Images
File Type: pdf
CC test results_20220216_0001.pdf (721.1 KB, 101 views)
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Old Feb 16, 2022 | 07:53 PM
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The telling tale is maybe 13, 14 & 15 empty!
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Old Feb 16, 2022 | 08:42 PM
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take look at this test page.

these are the test results from today. not sure what what check TCC means
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Old Feb 17, 2022 | 08:12 AM
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wow, you are a knowledge base, totally impressed! the X at C10/C14 was a fail. Im guessing I connect those
together then check for OHMS. not sure about the "check TCC/cruise check fix.(see #4).?

As far as vacuum lines, all are new and proven. can/should the engine be running to do this?
I will do those other checks you advised tho!

thank you will go at again
Bob R
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Old Feb 17, 2022 | 11:37 AM
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so, on a separate note, I noticed you posted at 1:47 AM and just posted at 11:01 AM. when do you sleep? :-)
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Old Feb 17, 2022 | 01:00 PM
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Then in that case, I WILL get this done! If there is a way I can help, PM me.

BobR
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Old Feb 18, 2022 | 09:30 AM
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Still no ohms either at connector or at the servo. Starting to suspect the TCC. My fuel mileage is bad, 9.8 gal. Will continue to check.
I WILL get this done

thank you for your help and patience.
Bob r
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Old Feb 18, 2022 | 05:57 PM
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A new test, some new questions.........help!

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Old Feb 18, 2022 | 08:24 PM
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it does go on/off! as far as vacuum, all is good, checked with a mighty vac. Im going to put the dash back
together and live test the servo.

stay tuned, got some chores to do first, then back at it.

thank you for patience and help.

Bob R.

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Old Feb 18, 2022 | 09:12 PM
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I did look over the IP. there no numbers on the outside. Could these numbers be on the inside?

BobR
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Old Feb 19, 2022 | 10:38 AM
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Originally Posted by ihatebarkingdogs
When new at the assembly plant, there is a sticker on the outside of the cluster. It will have the 8 digit part number and a 2 or 3 letter code in much larger, possibly colored, font. If there is no sticker, it is possible that the cluster has been changed during previous ownership.

Bryan at batee.com is very helpful and knowledgeable with the Atari Dash clusters. He may be able to tell you what to look for on the internal boards to determine if you have a K34 cluster or not. I personally don't have a clue. I know how to change the light bulbs and polarizing film, but that's the extent of my knowledge with them.
I guess thats what ill do,as there are no stickers on the outside

thanks for all your help. the next piece of this puzzle

Bob R
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To 88' electric schematic help

Old Feb 20, 2022 | 11:05 AM
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Default No GM number on my IP....BUT

Originally Posted by WVZR-1
What ever you find there 'D5" should certainly be B+ voltage. Anything else would be a 'surprise'.

Cruise control is actually I believe controlled in the cluster and Batee has much information. When you have the cluster in hand it might be interesting to find the GM # on your cluster to see 'IF' for sure your cluster supports K34 'Cruise Control'. I believe all clusters would have an 8 digit # starting with 2505, 2506, 2507 or 2508 maybe?
As suggested, I went to the Oracle, Yes that would Bryan at Batee.com. I have my answer, in pictures!

no cruise (k34)

with cruise a big thank you to Bryan

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Old Feb 20, 2022 | 12:16 PM
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Originally Posted by ihatebarkingdogs
Don't leave us hanging. Which cluster do YOU have? (After all this do you have the non-K34 after-all?)
I thought that likely a person could maybe just confirm some of the 'cavities' on the cluster side of the connector without going into the actually cluster and inspecting the PC's. I've never looked !!!
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Old Feb 20, 2022 | 01:05 PM
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LOL ! Got the K34 IP!1 Now, onward with the quest! stay tuned, and thanks to all!

Bob R
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