gotcha!

so there’s no “controls” for the other AC for the back because it’s essentially supposed to always run. Is there an easy way for me to tell that back one is running when the front is off?

So there is a separate high/low side for the battery AC then? It has a separate compressor too? I know basics of AC but this hybrid stuff is all new to me. I have gauges to check it all so I will be doing that next.

 

Single compressor. Dual evaps - just like SUVs with "rear air".

Rear A/C is used when the battery dictates it - not user controlled.. If A/C is underperforming, NOT using cabin A/C may improve rear A/C performance.

 

Gotcha. Thanks for the info! Im going to look at the AC next then, and see what I find out there.

 

So, got a manifold gauge set and I'm getting around 50psi from the low side, and only around 125 from the high side

I'm a fan of just 'replace it all' when doing any AC work, but is there anything quick/easy I could look at/replace/etc. to test out if this is my main issue before I replace everything?

 

There is a whole bunch of videos on troubleshooting A/Cs on YT. You should check that the expansion valve isn't stuck, that tends to happen a bunch. Can look up a pressure chart and guess off that too. You can electronically open the valve that goes to the back A/C with forscan. Would be interesting to see what happens to the pressures when you do that and the a/c is on.

 

Good info! Im gonna grab me a forscan and try that out, then. Especially since they are pretty inexpensive. It may be a couple weeks or more before I can replace the whole system so I wouldnt mind pin pointing the issue first even if I will still replace it all. Thanks!

 

Hey there Keith. I got a Forscan and messed around a little bit with it this afternoon. Its over 100F outside right now, so thats fun.

Anyway, I was wondering if you could help out with the info I got so far and also let me know if there is some more info that could be helpful as well. From a point of ignorance, it looks like a possible bad battery but I know someone with more knowledge could maybe let me know if there's something else that would cause these codes/readings.

Sorry these are pictures. I was trying to hurry and just snapped pics. Ill get the info exported next time instead.

 

There should be several other data pieces available. I would include those as well, especially DEL_MOD_V. The settings wheel should allow you to add them all.

The detail codes associated with P0A1F_30 and 19 may suggest a failed battery.

#30 outright says cell failure.

#19 suggests there may be a sensing issue - a broken wire or bad connection.

DEL_MOD_V will help confirm/refute the failed battery status.

 

Thanks for the help! I ran it with all options added, and here they are!



AVG_TEMP 39 °C Average Temperature
BATPAC_STAT Pack OK Battery Pack Integrity
BAT_AO_TMP 42 °C Battery Air Outlet Temperature
BSOC 50.85 % Battery Pack State of Charge (SOC)
CCNT_BCM 2 Continuous Codes
EVAP_TEMP 27 °C evaporator temperature
HEV_VEHSTAT Normal HEV Vehicle Status
IAT.OBDII 32 °C Intake Air Temperature
V_PACK 350.19 V Battery Pack Voltage
P0A1F_30_CM Yes Fault Cell Failure
P0A1F_04_CM No Fault (-) Contactor Voltage Sense #2 Fault
P0A1F_05_CM No Fault (+) Contactor Voltage Sense #2 Fault
P0A1F_06_CM No Fault (-) Contactor Voltage Sense #1 Fault
P0A1F_07_CM No Fault (+) Contactor Voltage Sense #1 Fault
P0A1F_09_CM No Fault VT Sensor #2 Top/Bottom Wire Fault
P0A1F_10_CM No Fault VT Sensor #2 Pack Voltage Sense Line Fault
P0A1F_11_CM Yes Fault VT Sensor #2 Module Voltage Sense Line Fault
P0A1F_12_CM No Fault VT Sensor #2 Reference Wire Fault
P0A1F_13_CM No Fault VT Sensor #2 Internal Severe Fault
P0A1F_14_CM No Fault VT Sensor #2 Internal Minor Fault
P0A1F_17_CM No Fault VT Sensor #1 Top/Bottom Wire Fault
P0A1F_18_CM No Fault VT Sensor #1 Pack Voltage Sense Line Fault
P0A1F_19_CM Yes Fault VT Sensor #1 Module Voltage Sense Line Fault
AVG_SOC 79.96 % Average State of Charge
DELT_SOC 44.98 % Maximum Difference in State of Charge
DELT_TEMP 2 °C Maximum Difference in Temperature
DEL_MOD_V 0.19 V Delta Module Voltage
DISCHRG_LMT 36000 Watt Discharge Power Limit
MAX_CHRG 31000 Watt Maximum Charge Power Limit
MAX_SOC 95.95 % Maximum State of Charge
MAX_TEMP 40 °C Maximum Temperature
MIN_SOC 49.97 % Minimum State of Charge
MIN_TEMP 38 °C Minimum Temperature
P0A1F_01_CM No Fault Pack Voltage Measurement Error
P0A1F_15_CM No Fault VT Sensor #2 Communications Fault
P0A1F_20_CM No Fault VT Sensor #1 Reference Wire Fault
P0A1F_21_CM No Fault VT Sensor #1 Internal Severe Fault
P0A1F_22_CM No Fault VT Sensor #1 Internal Minor Fault
P0A1F_23_CM No Fault VT Sensor #1 Communications Fault
P0A1F_27_CM No Fault Module Voltage Out of Range Low
P0A1F_28_CM No Fault Module Voltage Out of Range High
P0A1F_31_CM Yes Fault Battery Module Voltage Deviation Fault
R_LEAKN 377996 Ω Leakage Resistance (Bus -)
R_LEAKP 377996 Ω Leakage Resistance (Bus +)
TRAC_M_AMP -3.14 A Traction Main Current

 

DEL_MOD_V .019V is pretty good and does not suggest cell failure.

These are also good:
DISCHRG_LMT 36000 Watt Discharge Power Limit
MAX_CHRG 31000 Watt Maximum Charge Power Limit

This means the car will utilize the battery heavily if needed. These values get dropped very low when the battery is at a charge extreme (low charge/high charge), hot or not functioning properly.

There may be a problem with a sensing wire triggering _19 and/or _11. _30 may be set by those as well.

The computer may not regard those as hard failures and permit the system to function normally.

Quite the conundrum.