Posted to Technical Tips Forum on 5/1/2015
Toyota P0606 - Don't replace the ECM
The iATN archives helped me on this car so I wanted to
contribute back and hope someone else finds this helpful.
The complaint was the MIL on. The first time I saw this car
was from a referral by my local trans shop. They asked me to
flash the tcm per toyota bulletin for a shifting issue. The
flash went fine, now it's a month later and the Mil is on.
I pull code P0606. Description is ECM/PCM processor. A
discrepancy in voltage levels between the main cpu and the
sub cpu. The code chart is very short for this code, it
says, If you have code P0606 go to step A. Step A says to
Ok, I've been doing this long enough to know that I better
not replace the ECM just like that without doing some
research and testing. Since this is my first time with this
particular code I decide some iATN research is in order.
I come across this post in the techhelp archive http://members.iatn.net/techmail/view/index.aspx?m=19828&t=asian_drive
Ok, now I have something to go on. It seems that problems
with the O2 sensors can cause this code to set. I set my
scanner to graph the rear O2's. With the car running I start
wiggling and tugging on the sensor wires. When I move the
wire just right on B2S2 this happens rear o2 glitch
I replaced the sensor and cleared the code. It's been
several days since returning the car and all is good.
This is the value of iATN and collaborating in general. I
shudder to think about how this job could have gone if I had
no access to any further information than what was in the
Factory trouble code chart.
The information I found was more than a silver bullet. It
informed me of other possibilities I was unaware of and it
gave me something to test so I could prove out the problem
The conclusion is that I was able to fix a potential
nightmare problem in a very short time and I learned some
valuable information that may help me another day when there
is no other help to be found. A win win as the saying goes.
Robert from Massachusetts
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