Tyler-98-W68
Well-Known Member
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I’ve got a little bit more concrete data on how/why the vehicle will not operate in Electric mode for various different reasons. I’ve made previous posts about how to tell whether you are in FORM or not. I also did a test tricking the Ambient temperature sensor in an effort to keep the vehicle in electric mode when it’s very cold out. Today’s test was the reverse of that.
I haven’t been in FORM for well over a month now and temperatures have been between -10c & 15c. Nightly and morning temperatures being in the minus. Vehicle has been in my garage but I haven’t had the heat on for the last month so its temperature varies between -3c & 7c.
My test was to artificially cool down the ambient temperature sensor and observe the PIDs to see which one would change and make the vehicle use the ICE engine. I would then heat up the temperature sensor and watch the PID change again allowing Electric only mode.
I was able to cool the sensor down to -40c I wasn’t really trying to get it that cold but using compressed air it wasn’t the most scientific method. As soon as the temperature updated the following PID changed to FALSE
ESS Manager / IBS Communication HYBRID_ALLOW_EO went from “TRUE” to “FALSE”
True = Electric only operation
False = ICE Operation
This PID is part of the Hybrid Control Processor in the vehicle
I then took a heat gun and warmed up the temperature sensor. The first temperature to update was 18c once that updated the Hybrid Control PID went back to true. (sorry for the blurry photo)
Upon the ICE starting up the message “Electric Mode temporarily unavailable” Message popped up. When the Hybrid operating PID went to true the ICE turned off.
One interesting part of this test is the PID for
ESS Manager / IBS Communication – AMB_TEMP_ALLOW_EO never changed from “TRUE”
So there is no point to monitoring that PID for cold temperature operation.
In my ongoing journey for figuring out relevant PID’s here what I have so far
ESS Manager / IBS Communication HYBRID_ALLOW_EO
The following actions make this value go FALSE and start the ICE
Its important to remember if you have the FORM message, that is a different PID from what the above parameter is. Meaning if you are getting the Electric Mode Temporarily unavailable with no other messages. Its 99% likely the Hybrid Control Processor value has gone false.
I will continue to update and make posts when I find more information on the Hybrid Control Parameters, as I would prefer to have something more than just “True” or “False” to see exactly what is causing the EMTU.
For those having issues or problems and not getting anywhere with their dealership I encourage them to take the PID’s I’ve mentioned in this post and have the dealer techs look in to it. Their Wi-tech scan tools can more easily pin point the exact PID’s out of the thousands that I haven’t found yet (since I have to do it manually).
I haven’t been in FORM for well over a month now and temperatures have been between -10c & 15c. Nightly and morning temperatures being in the minus. Vehicle has been in my garage but I haven’t had the heat on for the last month so its temperature varies between -3c & 7c.
My test was to artificially cool down the ambient temperature sensor and observe the PIDs to see which one would change and make the vehicle use the ICE engine. I would then heat up the temperature sensor and watch the PID change again allowing Electric only mode.
I was able to cool the sensor down to -40c I wasn’t really trying to get it that cold but using compressed air it wasn’t the most scientific method. As soon as the temperature updated the following PID changed to FALSE
ESS Manager / IBS Communication HYBRID_ALLOW_EO went from “TRUE” to “FALSE”
True = Electric only operation
False = ICE Operation
This PID is part of the Hybrid Control Processor in the vehicle
I then took a heat gun and warmed up the temperature sensor. The first temperature to update was 18c once that updated the Hybrid Control PID went back to true. (sorry for the blurry photo)
Upon the ICE starting up the message “Electric Mode temporarily unavailable” Message popped up. When the Hybrid operating PID went to true the ICE turned off.
One interesting part of this test is the PID for
ESS Manager / IBS Communication – AMB_TEMP_ALLOW_EO never changed from “TRUE”
So there is no point to monitoring that PID for cold temperature operation.
In my ongoing journey for figuring out relevant PID’s here what I have so far
ESS Manager / IBS Communication HYBRID_ALLOW_EO
The following actions make this value go FALSE and start the ICE
- E-Save
- Acceleration causing the ICE to start
- EMU-CHOC
- Cold Ambient Temperatures
- Putting the shifter in Manual Shift Mode
- If you are in electric mode in park and touch the gas pedal
- HV Battery too low <1%
Its important to remember if you have the FORM message, that is a different PID from what the above parameter is. Meaning if you are getting the Electric Mode Temporarily unavailable with no other messages. Its 99% likely the Hybrid Control Processor value has gone false.
I will continue to update and make posts when I find more information on the Hybrid Control Parameters, as I would prefer to have something more than just “True” or “False” to see exactly what is causing the EMTU.
For those having issues or problems and not getting anywhere with their dealership I encourage them to take the PID’s I’ve mentioned in this post and have the dealer techs look in to it. Their Wi-tech scan tools can more easily pin point the exact PID’s out of the thousands that I haven’t found yet (since I have to do it manually).
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