Newbie/CPU??

[1goindiesel]

Hello all I am newly signed up to post but a long time lurker. I have a 97 70000mi 450 and a 180000mi 80 and a (sold) 82 40. My question is if you guys know where I can buy the cpu for my 97. Stealership wants 1300.00+ and I would rather get a still-healthy central computer from a wreck or otherwise discarded 450. Mine works all-correct except the power/2nd gear switch on the shift console has no effect except to light up the green light on the dash. Thanks and since I am a NEWBIE do not forget my double #1's salutes .

 

[firetruck41]

At that price, I'd live with it, as is. Hopefully, someone can pipe in with some troubleshooting to save you from replacing the ECU.

 

[NeverFinis]

I would be surprised if it was a CPU issue. Get the wiring diagram and check the curcuit.

 

[alaskacruiser]

1go- I wonder if that's an ECU issue, as well. You can try cruiserparts.net for cheaper prices, but considering the minor problem, I'd try other diagnostic methods first or live with it before I spent more than $200 on fixing that problem.

 

[Beowulf]

1goindiseasel,

You should know that there is a main ECU and an ECU for the transmission. Plus several other ECUs that probably are not related to this problem but the point is that you cannot buy a single ECU and fix all "computer" related problems.

As has been suggested, get the Electronic Wiring Diagram (EWD) and start from there. This may not even be an ECU problem.... could be a connector has fallen off or corroded or something simple.

-B-

 

[GXO]

Agree. There is a pretty delicate wiring run to that button through the console. I wouldn't be surprised if enough Starbucks lattes got in there to gunk it up.

 

[1goindiesel]

You folks are the best! I appreciate your input and will put it to use.

 

[alaskacruiser]

1goindiseasel,

You should know that there is a main ECU and an ECU for the transmission.
-B-

Beo- correction: the transmission has a separate ECU on the 93-94 models, but the ECU is integrated with the main ECU on '95-97. (Trivia: this isn't just because of the tranny switch, Australian 80s w/ A442Fs also got an integrated ECU from '95-97).

 

[Beowulf]

Isn't the box where we do the pin-7 mod a transmission ECU?
-B-

 

[alaskacruiser]

Beo- according to EWD, that is the "center diff lock relay".

 

[Beowulf]

OK. It has "Transmission Relay" written on it.

-B-

 

[1goindiesel]

1go- I wonder if that's an ECU issue, as well. You can try cruiserparts.net for cheaper prices, but considering the minor problem, I'd try other diagnostic methods first or live with it before I spent more than $200 on fixing that problem.

Local Lexus dealer ECM (yes they say there is just one main ECM) 1350.00. cruiserparts.net 250.00 for a good used one. SO...lets see here, if I do need a new ECM for this little problem this forum has saved me 1100.00. Now that what I call HELPFUL!! Thanks again.

 

[firetruck41]

I would definitely check the switch itself and the circuit first, as I don't think I have ever heard of someone needing to replace the ECU for those switches not working.

How do you know they aren't working?