Communication issue with ECU is250 2006

[jacklex]

i own a 2006 is250, on purchase had a small air leak on the exhaust, after driving for few days suddenly Check VSC came on the screen along with the TC and EML light, i understand the VSC message/TC light should be coming on anyway when i have an issue with my engine.

 

 

so i was under the impression that the issue is the exhaust leak, which in turn is causing the O2 sensors to read poor figures, and throwing the engine light ect on,

 

Now sometimes when im driving all the lights just extinguish and stay off for 24/48 hours but they do come back on eventually, and they will go away again themselves. 

 

due to this issue i originally just had a Check VSC code in the ABS/TC computer, and a O2 sensor code for the engine ecu.

 

we use a snapon Modus and have Bosch Esi at work and both machines will not connect to and/or read manually or automatically. so i cant even clear the codes manually now, it wont open the ecu option, and even if i just force clear all codes it only picks up 3 units (aircon, body control module, and smart key access)

any help really appreciated, its an automatic if that makes any difference at all. 

 

i was considering pulling the exhaust off and repairing it because of the o2 code, but obviously if there's a deeper electrical issue that's the least of my worries for now

 

[jacklex]

this is also sort of the issue im getting with VCS EML and TC light

but i cant perform a code read at all to figure out the issue haha

[Linas.P]

Interesting times, as it seems there were several threads concerning IS250 and some sort of ECU problem. I was fighting mine since December without much luck.

My assumption would be - bad ground somewhere or damage to wiring which causes communication issues between the modules.

I would not want to speculate too much as I could not even solve my own issue, but strangely I had O2 sensor issue before the car went completely dead.

[jacklex]

On 3/24/2022 at 5:40 PM, Linas.P said:

Interesting times, as it seems there were several threads concerning IS250 and some sort of ECU problem. I was fighting mine since December without much luck.

My assumption would be - bad ground somewhere or damage to wiring which causes communication issues between the modules.

I would not want to speculate too much as I could not even solve my own issue, but strangely I had O2 sensor issue before the car went completely dead.

reassuring hahaha!!

 

so basically ive figured out the car wont connect to any of the code readers while the EML/TC lights are active, this now makes me think theres actually no issue, and the problem is as you say, a ECU or module earth/communication, would explain lack of codes showing aside from that lambda one

 

will update if i find anything out