Culprit: 2006 Evo IX
Problem: ACD keeps going into stand-by mode (3 setting lights - tarmac, gravel, snow)
Attempts to rectify:
1. Reset ECU (disconnect battery)
2. Bleed ACD manually
3. Bleed ACD electronically
4. Replace ACD pump with a pump with only 13k miles
5. Swap ACD ECU since mine was tuned and it was the only thing that changed in the ACD system since two events ago. ACD worked fine for two event's after the ACD tune.
6. Checked ABS sensors for broken wires or anything out of the ordinary
7. Checked Resevior level.
Things to consider:
1. No DTC's present on Evoscan
2. Pressure switch column on data log shows 0 the whole time. Is this normal? Evo scan calls it out as a confirmation switch for high and low pressure.
3. The data log is showing a correlations between the mA sent to the center differential solenoid and TPS / Steering angle etc. But, after 30 seconds up to 2 minutes, the mA falls off a cliff.
4. Oil Pressure in the accumulator stays constant at 72 psi. Is this normal?
The data log can be downloaded here for reference:
https://www.dropbox.com/s/p4gwwany06...9_19.41.37.csv
Questions:
1. Has anyone had an ABS sensor fail without it throwing a code?
2. Are the differences between the wheel speeds on the data log normal? Is there a plus/minus tolerance that it needs to be in so it doesn't throw off the ECU?
3. Are there any relays associated with the ACD?
4. Is there something I'm overlooking?
Thanks in advance. I appreciate any feedback on similar issues.