trouble codes 93 LC please help (1 Viewer)

[foreste2002]

My 93 Landcruiser is showing the following codes

83

84

85

Can anyone tell me what they mean and which components might be involved? (I read TCM Communication, but I have no idea what that means or if it is accurate)

Thanks,
Eric

 

[cruiserdan]

You hava an early 93 (built before May 93) with an engine ECU #89661-60170 or 89661-60220 (Ca emissions). You have TCM-ECM communication problems. In order to correct it you will need to replace the engine ECU with one numbered 89661-60221. You may be able to find a used one out of a late 93 or a 94. A new one lists for $1,575.79

D-

 

[alaskacruiser]

CDan- just out of curiosity: what causes the problem, what does "TCM-ECM communication problem" mean, and is there any harm to leaving it be?

 

[cruiserdan]

The problem is in the original ECM. The later part number addresses the problem. I do not know the long-term effects of not changing the ECM.

 

[foreste2002]

Thanks...my problem is a stumbling after stopping for a light or stop sign, only sometimes. Also, sometimes at startup after the truck is warm and shutoff for a few minutes, the idle races up and down a few times. Also, when warm the idle acts as if a cold start valve was firing fuel when it shouldn't at startup. Are these all clues to the control unit being bad?
Thanks,
Eric

 

[OGBeno]

The problem is in the original ECM. The later part number addresses the problem. I do not know the long-term effects of not changing the ECM.

It would be nice to just be able to do a firmware update a la motherboards on computers.

$1600 is a crazy amount of money!

[at least for me.... ]