2 ecm questions

[cougar]

[ellis93]

They're on this forum,in the electrical section,I posted them awhile back

[cougar]

[cougar]

[ellis93]

I can look Monday,I didn't see this again,my bad

[Bob L]

Cougar, the ECM (PCM) for an automatic transmission is different than that for a manual transmission.

Be carefull that you get the correct ECM (PCM) schematic for your type transmission. Automatic right ?.

The amphonal plug that plugs into the ECM sometime's gets loose or corroded. Make sure it's clean (super clean) and tight fitting in the ECM. The contacts are very small and sometimes go open.

I think I have the schematic for a MT if that will help. May take a little looking.
plus if you decide to replace it make sure you get the correct ECM for your transmission type.
I know the schematic's are available on-line somewhere.

[Bob L]

Cougar here's some of what I have. I will keep looking for more.
Hope this helps you.

A.S.D. = Auto shut down relay.

Pin #55 >20DR/LG goes to the trans OD solenoid. The PCM didn't show it on the grid chart. But when you go into the section for OD system it shows it there.

Pin #10>20OR/WT goes to the trans OD switch.

Pin #37> 20BK/OR goes to the trans OD switch.

Pin #53> 20LG/RD goes to the cruise servo

Pin #33> 20TN/RD goes to the cruise servo. Vacum controll

Pin#29> 18WT/PK Brake sense

Pin#50> 20WT/LG cruise resume

Pin#48> 20BR/RD cruise set

Pin#49> 20YL/RD cruise on/off
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Pin 30 >Prk/neutral 20Br/Yl
Pin #16 >Grid heater #1 18YL/BK
Pin #20 >generator field
Pin#15 >Grid Heater relay #2 18OR/BK
Pin#9 >ignition feed 14DB
Pin#51 >A.S.D. relay 20DB/YL
Pin#57 >A.S.D. battery 16DG/OR
Pin#3 >battery feed 16RD
Pin#32 >malfunction light 20BK/PK
Pin#43 > tach 20GY/LB
Pin#56 >wait to start lamp 20DG/WT
Pin#54 >water in fuel lamp 20BK/PK
Pin#11 >power ground 18BK/TN
Pin#12 >power ground 18BK/TN
Pin#45 >data link recieve 20LG
Pin25 >data link transmit 20PK
Pin#5 >signal ground 16BK/WT
Pin#47> VSS 20WT/OR
Pin#7 >8 volt input 18TN/YL
Pin#2 >ECT sensor 20TN/BK
Pin#1 > water in fuel sensor 20WT/BK
Pin#21 > air intake sensor 18BK/RD
Pin#24 >Crank position sensor 18GY/BK
Pin#28 >therm switch 20LG/RD
Pin#22 >T.P.S. 18OR/DB
Pin#4 >sensor return 18BK/LB
Pin#6 >5 volt supply 20VT/WT
Pin#34 >W.O.T relay 20DB/OR
Pin#27 >A.C. compressor 18BR
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[Bob L]

Cougar,
I have additional schematics but can't seem to post them. If you PM me your email address I will send them to you.

Maybe someone else can post them if they PM their email.

[cougar]

[Bob L]

What I need is the electronic schematic for the ecm/pcm itself. I need to know what's "in the box". I put in my spare ecm and only a marginal improvement. It's not freaking out anymore. Here is what is going on. If I adjust the TPS for 1 volt at idle OD will not shift in, but cruise control works fine. If I crank the TPS way down until it is off the throttle it shifts into OD just fine, but the cruise control runs away. Right now I have it set at the best compromise I can get, a slight letup on the throttle drops it into OD without it being too sensitive on a throttle up causing a down shift. I have been through every wire and connector even bypassing some to lower any odd resistance values.

WOW----I don't know that I have ever seen the schematic of the iner workings of the ECM/PCM.
You might PM either Philip or maybe Mark Nixon, or maybe someone else will see this and has that info.

In the meantime I will keep looking, now that I know exactly what you are looking for.

[cougar]

[cougar]

[cougar]

[Mark Nixon]

How did you clean the "potting gunk" from the board?
I've tried to clean them and came to the conclusion that knocking off the bigger chunks with my fingers and screwdrivers, then a fine brush on a dremal is about the quickest, yet safest, way to clean it without damage.
Even so, it's a tedious and very dirty task.

Mark.

[cougar]