how to do a diagnostic

[Monkey]

Originally Posted by suprra_girl

yep... ppl have used paper clips

that white gunk is used to keep the terminals in good health i believe

That white gunk is waterproofing/dielectric grease that helps keep water out of electrical connections, and it also helps to promote electrical conductivity.

[89whitedevil]

hey im impressed you really do you homework i think your the first person i have seen in a while that has this much info on this old of a car (i am a mechanic as my profession) and i work on brand new cars there much less complex than the older import cars it is hard to find info on alot of this stuff like codes wiring schematics ect. but just for info sake i have acsess to all of that so if anyone need this info let me know i also have diagnoistic procedures too i can post them really easily....

[dannydavi]

hey first off i really wanted to say this is an awesome technique, thanks for sharing. Second i got an error code 14: which is with ignition signal, diagnosis is no IGF signal to ECU... then it says "A" 7M-GE 6-8 which i dont understand, trouble area: ignition and ignition coil circuit, igniter and ignition coil, ECU. I also got trouble code 21: which is either oxygen sensor signal or oxygen sensor heater signal, So basically what im asking is can someone help me understand my trouble codes, and perhaps lead me in the right direction to eliminate my trouble codes, thank you.

[SupraSaver87]

I got what I think to be error code 11, however there isn't a code 11 in that manual. Wonder if someone could help me out with this one. Although my CDS (Possible standing for Computer Diagnostic System) fuse is blown.

I don't get a check engine light when driving, or when sitting with ignition set to "on".

[suprra_girl]

momentary interruption of power supply to ecu

check all grounds, battery to chassis and grounds on the manifold as they may be broken or crappy connection

[khills]

i was driving on the highway for about 5 or 6 mins (city driving 10 mins before highway) and the check engine light came on. after leaving the car parked for 2 hours, i started it up and it was off...untill iw as on the highway for, again, 5 mins. I got home, turned the engine off, took the keys out and restarted the engine, and it didnt come on..

tryed to figure out that E1 and T thing...i dont know what im doing though, i THINK i know what cable to play with..but i dont know which is T and which is E1....even if i do, will the code show up if the light doesnt come on until the highway?

(1986)

[suprra_girl]

sounds like code 52 which is knock sensor, check to make sure your plugs aren't broken and that (if turbo) both are plugged in (if na) that "the" knock sensor is plugged in

get a piece of wire and you should have to open the lid on the diagnostic box, inside the lid is a diagram of what each pin is, there you should find where te1 and e1 is

if ever you do a diagnostic and you have put the wire in but your check engine light stays lit and doesn't blink thats because the wire has not made firm connection in both of the terminals

[khills]

call me stupid, but i cant find a thing that talks about the knock sensor, even online all i get is 1992 and newer...i dont know where the thing is..

(it couldnt have been my gas cap not fully tightened could it? i saw today that it hadnt been tighened all the way till it snapped. I know the newer cars have that problem connected to teh 'check engine' but im not sure if the older models do)

[okinawasupra]

great info thanks!

[gfrererr13]

Will this work the same for a MKIV Supra as well? or is there anything different that needs to be done? Thanks!