:lol:DarkStar said:Yes.leafwing said:Is it a software or a hardware issue?
:lol:DarkStar said:Yes.leafwing said:Is it a software or a hardware issue?
palmermd said:sdbonez said:He went away for a bit and just came back and confirmed to me that yes my VIN #728 IS impacted.
Next time be sure to ask him for the entire list of effected VIN's. Thanks for the update.
bowthom said:P0AA6 HIGH VOLTAGE SYSTEM ISOLATION
Description INFOID:0000000006977190
Li-ion battery is equipped with the IR (Insulation resistance) sensing system. VCM receives the IR sensor signal
sent from Li-ion battery controller and monitors the insulation resistance of the high voltage circuit.
DTC Logic INFOID:0000000006977191
P0AA6
HYBRID BATT VOLT SYS ISOLATION
(High voltage circuit insulation is low)
VCM detects a insulation resistance calculated
based on IR sensor signal sent from Li-ion battery is 380 kW or less.
• High voltage harness or connectors
• Electric compressor
• PTC elements heater
• Traction motor
• On-board charger
• Li-ion battery
• DC/DC J/B
bowthom said:Must be a typo "3127" below, no such DTC exists in the manual.
What does VCM stand for?mogur said:Yes, it would appear that the VCM is falsely sensing that the A/C compressor has an electrical leak to ground. One wonders how reducing the refrigerant level would have any affect on this... Perhaps if the compressor draws more than a programmed amount of power the system just ASSUMES that the extra power is going to ground and shuts down.
LindaK said:bowthom said:Must be a typo "3127" below, no such DTC exists in the manual.
You're so right Bowthom...sorry it took me so long to get back to this. The second DTC was P31E7. You have also inspired me to download the service manual. Thanks!
AmarilloLeaf said:LindaK said:bowthom said:Must be a typo "3127" below, no such DTC exists in the manual.
You're so right Bowthom...sorry it took me so long to get back to this. The second DTC was P31E7. You have also inspired me to download the service manual. Thanks!
Where do we download the service manual?
turbo2ltr said:AmarilloLeaf said:Where do we download the service manual?
http://www.leafic.com/wiki/index.php/Service_Manual
bowthom said:Hello,
My thought is: The IR sensor is at the battery pack and it can easily detect the return current so GFI only needs a stable ground reference. The VCM (vehicle control module) must also have a stable ground reference but the two grounds cannot be tied. The control electronics are on the aux battery and use the chassis. They must be isolated from the HV traction battery and all parts driven by it. Their only link is the DC to DC converter where power is provided to the VCM and acc. Those two grounds untied yet dependent on each other. When high current causes one, the other or both grounds to drift, the VCM sees this as leakage because the GFI ground is no longer centered between the forward and return current sense.
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