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Username Post: Manually grounding ALDL OBD1 connector        (Topic#350531)
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
04-08-18 01:16 PM - Post#2730361    

Since local store could not get a reading off the OBD1 connector I want to try doing it the old fashion way of grounding the connector to use the check engine light to grab the code, especially "code 12"

I am concerned my ECM may have been surged by previous owner.

concern is based on fuse box, top half of the fuse clip on left side is missing on the ECM1 fuse terminal. And the big deep scorch discharge mark on the protective casing on the +battery terminal cable

THe ALDL terminal has total of 5 wires on the top row with one missing at the 3rd of 4th from left.
Do not know what color the wires are did not have anything to write it down.

I have googled looking for another connector with the same wiring, to see which two wires I put a steel paper clip into, so it will flash using check engine light.

I know enough about electrician work, to NOT just randomly bridge various wires, till it works. Or risk frying your electronics.



 
2plus2 
Member
Posts: 1138

Loc: Mission,BC
Reg: 02-03-05
04-08-18 02:54 PM - Post#2730370    
    In response to VanLife

https://www.obd-codes.com/faq/read-gm-2-digit-o bd-...

69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
07 Town Car Loaded,Tinted,Getting Bagged


 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
04-10-18 02:56 PM - Post#2730603    
    In response to 2plus2

Problem is I took that connector off its mount and looked at the lettering.

I believe it was installed wrong to begin with my wires are all mounted on the "M" side of the terminal
but when its mounted its across the top.

I do know some of the ECM connectors were installed wrong where "d" row was on the opposite side. where there was a GM bulitin sent out to warn people of the possibility that its backwards.

That diagram is a generic diagram. not my van specifically with possibility that wiring was not done right on assembly line.

are all A,B top right or top left or both?? or in various spots depending on make?

Point is Based on the lettering, stamped on the connector, I don't have wires in A,B and the OBD1 couldn't read it.

So I have to be absolutely sure.
There is a possibility someone else jumper-ed the wrong ones for the same reason as I pointed out rather than confirm beforehand which was which.

which wires need to be jumped is what I need to know Not necessarily which hole its in. I am not so sure mine is wired right.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24365
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-11-18 06:25 AM - Post#2730666    
    In response to VanLife

Use the factory diagrams. Were you able to download a copy?

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
04-11-18 06:11 PM - Post#2730748    
    In response to gchemist

service manual you mean?

I did not see any diagrams in that link you sent me in the van thread.

Its a pain to navigate a large PDF, the "find word" only partially works. and it has a crappy page of content that has nothing to do with page numbers. takes forever to get a page to load. so basically you have to go page by page waiting for each page to load to actually find anything. and if you can't remember what page it was on your screwed. The "find word" is NOT finding the codes in the table of content. so I can't just jump to ECM diagnostics for example.

here are things about , my van that are not matching up. I have no idea what the previous owner did to it.

example square headlights instead of round.
all the wrong radiator hoses showing up in catalogs, same with fan blades, instead of what is on the van.

I am off grid so it takes the PC long time to process in battery mode.

its not as time efficient as opening a book that is easy to navigate.

It is taking me an hour to do what would take me a couple of minutes using a book. But if I forget what page something is on then got to do the process over from scratch.

I been trying to save pages of relevant info but its VERY slow going when I only have so much batter power and no access to AC power. except for a couple of hours at library but I can'y look at van when I am doing the to reference.



Edited by VanLife on 04-11-18 06:13 PM. Reason for edit: No reason given.

 
gchemist 
Senior Chevytalk Moderator
Posts: 24365
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-15-18 05:13 AM - Post#2731015    
    In response to VanLife

Look here: http://forum.73-87chevytrucks.com/smforum/index.ph...

Truck and van wiring were nearly identical for most systems.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
04-15-18 12:42 PM - Post#2731049    
    In response to gchemist

http://www.73-87chevytrucks.com/techinfo/wiring_di...

I am NOT a electrician. So if I am reading this right, I am looking for white/black wire and a black wire that I bridge then?
which is spelled out ALDL at the top right area or the lower right if you turn it 90 degrees to right?

THen I watch the pulses of the service engine light if the computer is working correctly.

I bombed Morse code. Hopefully All I have to do is keep track of short and longs and they put enough time between the codes so it does not run on and on.

Thanks for the link by the way.

in mine if my connector is backwards D or C is empty of wire. Where in diagram its E is empty.

Could this be why OBD1 reader could not read it?

Also all of my wires are on the "M" side when the connector is mounted that is the top row

Diagran does not indicate what side is suppose to be top row. which matters to the OBD1 top or bottom, doesn't it?

They don't have the V6 engine compartment wiring on that link though just the I6 and V8



Edited by VanLife on 04-15-18 12:53 PM. Reason for edit: No reason given.

 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
04-16-18 02:43 PM - Post#2731190    
    In response to VanLife

gchemist:

if the diagram is for a inline 6 computer then it would make sense why they don't match. since there is no mention of wiring diagram for v6 only I6

something is wrong with my wiring. based on the wiring diagram you linked to

not in any particular order:(i believe 2 wire space 3 wire top row.)

brown,
orange with white stripe
Black with white stripe
white (maybe with thin black strip hard to tell)
tan with white stripe

unless I am looking at it wrong and it is actually something else due to it being 5 wires in one strip and pulled apart at connector. instead of independent wires.



Edited by VanLife on 04-16-18 02:46 PM. Reason for edit: No reason given.

 
gchemist 
Senior Chevytalk Moderator
Posts: 24365
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-16-18 03:25 PM - Post#2731194    
    In response to VanLife

I6 and V6 are different. V6 was TBI. I6s were never FI. Except for Ford I6. What is the van build date? It should be on the driver side door. I would consider going up a year to 88 TBI wiring to try and match colors. I'll do a search for 87 V6 diagrams.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
gchemist 
Senior Chevytalk Moderator
Posts: 24365
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-16-18 03:30 PM - Post#2731196    
    In response to gchemist

Checkout this information: http://starkvillereads.org/images/1987-chevy-c30 -w...

OH!! Forgot to mention to sign up at www.autozone.com. Go to their maintenance and repair section. Autozone has factory diagrams from service manuals. Most common manufacturers can be found there. Well, not Ford anymore. Apparently Autozone and Ford a copyright argument over factory manuals.

Using my phone app, I see a ton of van information for V6 models.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 04-16-18 03:41 PM. Reason for edit: No reason given.

 
VanLife 
Contributor
Posts: 111

Reg: 03-20-18
04-17-18 02:42 PM - Post#2731320    
    In response to gchemist

Been hanging out at a local auto zone. been driving some of them nuts because I come in looking for something which is often miss-cataloged or they have no knowledge of.

or they look something up to get a NYA, but its listed elsewhere (due to bad cataloging) but they don't want to spend the time tracking it down.




 
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