hybrid system not working. loss of power to system

msandhu413

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Hello folks,
Need help troubleshooting hybrid system on the 2.0 etorque system. Jeep is out of warranty.
The hybrid system is not working at all. Error code that I am getting is Lost communication with the power hybrid module. I thought it was the MGU (alternator) first which includes the hybrid power module so with help of a mechanic friend (who is not familiar with this system) i quickly replaced it but that was not the problem; unless i have to reset something.
Not sure what exactly is happening here but one thing i am noticing is that the 12volt battery is not being charged. I did measure the volts at the MGU (alternator) and with the engine started it was showing 4V (at the red connection on it); i am thinking this should be much higher. I did take the jeep for a test drive and it stalled on me in the shopping center parking allot and would not start even with jumper cables (kept saying the shift the gear in "P" even after disconnecting the battery). So i took the 12 battery home and charged it and put in back in the jeep and it started right up. Really weird?
Why is the 12V battery not being charged with the new MGU? Could it be the 48V battery pack, 12V battery, fuses etc... ?
Any ideas what to look for?
Mac





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Windshieldfarmer

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Hello folks,
Need help troubleshooting hybrid system on the 2.0 etorque system. Jeep is out of warranty.
The hybrid system is not working at all. Error code that I am getting is Lost communication with the power hybrid module. I thought it was the MGU (alternator) first which includes the hybrid power module so with help of a mechanic friend (who is not familiar with this system) i quickly replaced it but that was not the problem; unless i have to reset something.
Not sure what exactly is happening here but one thing i am noticing is that the 12volt battery is not being charged. I did measure the volts at the MGU (alternator) and with the engine started it was showing 4V (at the red connection on it); i am thinking this should be much higher. I did take the jeep for a test drive and it stalled on me in the shopping center parking allot and would not start even with jumper cables (kept saying the shift the gear in "P" even after disconnecting the battery). So i took the 12 battery home and charged it and put in back in the jeep and it started right up. Really weird?
Why is the 12V battery not being charged with the new MGU? Could it be the 48V battery pack, 12V battery, fuses etc... ?
Any ideas what to look for?
Mac
I believe the hybrid parts have an 8 year warranty.
 
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msandhu413

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what does this mean? As in the vehicle was wrecked and declared a total loss therefore negating the warranty?
Correct. Not a major accident no body damage but the bumper brackets got bent so declared a loss.
 

mwilk012

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Correct. Not a major accident no body damage but the bumper brackets got bent so declared a loss.
That sucks, frame replacement is not unreasonable for a Jeep.

Your alternator isn't charging. Now that they have complicated the system, I have no idea what signal is required to energize the field to turn on the generator.
 
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msandhu413

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That sucks, frame replacement is not unreasonable for a Jeep.

Your alternator isn't charging. Now that they have complicated the system, I have no idea what signal is required to energize the field to turn on the generator.
Can someone check how much volts does the MGU (generator) is producing. I checked again on mine is it showing around 11.5volt (with jeep started -idle). I am thinking it should be producing 48V?
THanks.
 

mwilk012

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Can someone check how much volts does the MGU (generator) is producing. I checked again on mine is it showing around 11.5volt (with jeep started -idle). I am thinking it should be producing 48V?
THanks.
Even if it was designed to charge at normal dc voltage, It should not be producing <12 volts.
 
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msandhu413

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Even if it was designed to charge at normal dc voltage, It should not be producing <12 volts.
It is brand new - the same was happening to the original. Now i am thinking it could be the PCM not communicating properly...
 
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msandhu413

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https://www.jlwranglerforums.com/JL-Wiring-Diagrams/STARTING_CHARGING-SYSTEM---2.0L---eTORQUE.pdf

Looks like the motor generator should put out 48v directly and the PDC (whatever form that takes on the 2.0) should drive the 12v system from there.

Note that 48v can kill you, just saying.
It is not putting out 48v. volt meter showed not even reaching 12v. I will test out the PCM with diagnostics tool to see what results i get.
Also, is there a generator fuse (maybe in the fuse array..)?
 

mwilk012

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It is not putting out 48v. volt meter showed not even reaching 12v. I will test out the PCM with diagnostics tool to see what results i get.
Also, is there a generator fuse (maybe in the fuse array..)?
Fuse F69 in the PDC.
 

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