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DTC No. P0AA9-00 IR Voltage Lower Saturation Diagnosis
DTC No. P0AAA-00 IR Voltage Upper Saturation Diagnosis
 
 
 
 
DTC SET CONDITION
Check Condition
  • During BMU activation (except when the quick charge connector is connected and just after the A/C compressor is driven)
Judgment Criterion
  • The abnormal insulation resistance monitoring voltage is detected.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the BMU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.Check whether the DTC is set again.
(1) Erase the DTC set in the BMU2.
(2) Erase the DTC set in the BMU.
(3) Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
(4) Wait for 1 minute or more.
(5) Check whether the DTC is set again.
Is the DTC set?
Disassemble the drive battery (Refer to SERVICE PROCEDURE). After the disassembly, replace the BMU (Refer to BATTERY MANAGEMENT UNIT (BMU) REMOVAL AND INSTALLATION).
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).