DTC P0AA6 (59)
DTC P0AA6 : HV Battery Voltage System Isolation Fault
This procedure includes high voltage measurements with the electric powertrain system turned on. To avoid serious injury from electrical shocks while testing the high voltage cable, use insulated gloves, select a DC range of 500 V or more on your digital multimeter, and be careful not to contact each tester probes and not to contact any metal parts while you measure the high voltage cable.
NOTE:
- Before you troubleshoot, review the general troubleshooting information .
- Put on insulated gloves and use insulated tools to protect you from electrical shock.
- When you measure the insulation resistance, use a DC range of 500 V or more on your digital multimeter.
- When disassembling and assembling the battery pack, check for leaking electrolyte and take necessary precautions to handle it .
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| P0AA6 HV Battery Voltage System Isolation Fault |
DTC (Electric Powertrain)
- DTC check
-1. Turn the vehicle to the ON mode.
-2. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0B3B HV Battery Cell Voltage Sense Circuit 1 P0B40 HV Battery Cell Voltage Sense Circuit 2 P0B45 HV Battery Cell Voltage Sense Circuit 3 P0B4A HV Battery Cell Voltage Sense Circuit 4 P0B4F HV Battery Cell Voltage Sense Circuit 5 P0B54 HV Battery Cell Voltage Sense Circuit 6 Are DTC P0B3B, P0B40, P0B45, P0B4A, P0B4F, and/or P0B54 indicated?
YES
Go to the indicated DTC's troubleshooting.
NO
Go to step 2.
- Problem verification 1:
Check these items:
- Transmission in P
- A/C switch and heater fan switch OFF
-2. Turn the vehicle to the ON mode.
-3. Clear the DTC with the HDS.
-4. Turn the vehicle to the OFF (LOCK) mode.
-5. Turn the vehicle to the ON mode.
-6. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0AA6 HV Battery Voltage System Isolation Fault Is DTC P0AA6 indicated?
YES
Go to step 7.
NO
Go to step 3.
- Problem verification 2
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Raise the vehicle on a lift .
-3. Turn the vehicle to the READY TO DRIVE mode.
-4. Select the EV driving mode by EV switch.
NOTE: If the vehicle cannot enter the EV driving mode because the high voltage battery SOC is low, charge the high voltage battery by the No-Load Charging Procedure .
Test-drive the vehicle for 1 minute.
NOTE:- Do not apply the brake hard when working on a running vehicle on a lift. It may cause some damage to the drive-line.
- A/C switch and heater fan switch OFF
-6. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0AA6 HV Battery Voltage System Isolation Fault Is DTC P0AA6 indicated?
YES
Go to step 6.
NO
Go to step 4.
- Problem verification 3
-1. Turn the A/C switch to ON.
NOTE: Temperature set to MAX COOL.
-2. Wait for 1 minute.
-3. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0AA6 HV Battery Voltage System Isolation Fault Is DTC P0AA6 indicated?
YES
Replace the electric A/C compressor .
NO
Go to step 5.
- Problem verification 4
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Turn the vehicle to the ON mode.
NOTE: A/C switch and heater fan switch is OFF
-3. Enter the maintenance mode to start the engine . Hold the engine speed between 2, 500 rpm and 3, 000 rpm for 1 minute.
-4. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0AA6 HV Battery Voltage System Isolation Fault Is DTC P0AA6 indicated?
YES
Go to step 6.
NO
Intermittent failure. The system is OK at this time. Check for poor connections, loose terminals. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.
- Motor check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Remove the service plug .
-3. Remove the PCU .
-4. Measure the resistance between body ground and traction motor and generator motor 3-phase terminals U, V, and W individually.
Is there 305 kΩ or less?
YES
Faulty traction motor or generator motor, replace the transmission (e-CVT) assembly .
NO
- Battery module electrolyte leak check
-1. Remove the service plug and the IPU cover .
-2. Check the electrolyte leaks from each battery module.
Is there electrolyte leakage?
YES
Go to step 16.
NO
Go to step 8.
- Determine possible failure area (electric A/C compressor, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the electric A/C compressor high voltage cable 2P connector (A) from the subjunction board.
-3. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Electric A/C compressor high voltage cable 2P connector (subjunction board side): disconnected Test point 1 Electric A/C compressor high voltage cable 2P connector (subjunction board side) (female terminals) No. 1: Test point 2 Body ground Test point 1 Electric A/C compressor high voltage cable 2P connector (subjunction board side) (female terminals) No. 2: Test point 2 Body ground Is there 305 kΩ or less?
YES
Go to step 9.
NO
Go to step 10.
- Electric A/C compressor high voltage cable check
-1. Disconnect the electric A/C compressor connector A (2P) from the electric A/C compressor .
-2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Electric A/C compressor high voltage cable 2P connector (subjunction board side): disconnected Electric A/C compressor connector A (2P): disconnected Test point 1 Electric A/C compressor high voltage cable 2P connector (subjunction board side) (female terminals) No. 1: Test point 2 Body ground Test point 1 Electric A/C compressor high voltage cable 2P connector (subjunction board side) (female terminals) No. 2: Test point 2 Body ground Is there 305 kΩ or less?
YES
Failure in the electric A/C compressor high voltage cable. Replace the battery power cable .
NO
- Determine possible failure area (PCU or battery power cable, others)
-1. Disconnect the battery power cable terminals (A) from the subjunction board .
NOTE: Wrap the subjunction board terminals with insulating tape.
-2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Battery power cable terminals (subjunction board side): disconnected Test point 1 Battery power cable terminal (subjunction board side) (+) (A) Test point 2 Body ground Test point 1 Battery power cable terminal (subjunction board side) (-) (B) Test point 2 Body ground Is there 305 kΩ or less?
YES
Go to step 11.
NO
Go to step 12.
- Battery power cable check
-1. Disconnect the battery power cable connector from the PCU .
-2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Battery power cable (PCU side): disconnected Battery power cable terminals (subjunction board side): disconnected Test point 1 Battery power cable terminal (subjunction board side) (+) (A) Test point 2 Body ground Test point 1 Battery power cable terminal (subjunction board side) (-) (B) Test point 2 Body ground Is there 305 kΩ or less?
YES
Replace the battery power cable .
NO
- Determine possible failure area (leak sensor circuit, others)
-1. Disconnect the following connector.
Subjunction board connector A (5P) -2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Subjunction board connector A (5P): disconnected Test point 1 Subjunction board connector A (5P) (female terminals) No. 1: Test point 2 Body ground (G701) Test point 1 Subjunction board connector A (5P) (female terminals) No. 5: Test point 2 Body ground (G701) NOTE: When you measure the insulation resistance on the subjunction board connector A (5P) terminal No. 1, connect the positive pole side of the tester (A) to body ground (G701), and connect the negative pole side of the tester (B) to the subjunction board connector A (5P) terminal No. 1.
Is there 305 kΩ or less?
YES
Go to step 13.
NO
Go to step 14.
- Shorted wire check (BATT+ line, BATT- line)
-1. Disconnect the following connector.
Battery condition monitor module connector A (28P) -2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Subjunction board connector A (5P): disconnected Battery condition monitor module connector A (28P): disconnected Test point 1 Subjunction board connector A (5P) (female terminals) No. 1: Test point 2 Body ground (G701) Test point 1 Subjunction board connector A (5P) (female terminals) No. 5: Test point 2 Body ground (G701) Is there 305 kΩ or less?
YES
Repair a short in the BATT+ wire or the BATT- wire between the battery condition monitor module (A15, A4) and the subjunction board.
NO
- Subjunction board check
-1. Remove the IPU and the IPU case .
-2. Remove the busbars (A) from the subjunction board .
-3. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Test point 1 Subjunction board high voltage terminal (A) Test point 2 Body ground Test point 1 Subjunction board high voltage terminal (B) Test point 2 Body ground Is there 305 kΩ or less?
YES
Replace the subjunction board .
NO
Go to step 15.
- Junction board check
-1. Remove the busbars (A) and (B) from the junction board .
-2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Test point 1 Junction board high voltage terminal (A) Test point 2 Body ground Test point 1 Junction board high voltage terminal (B) Test point 2 Body ground Test point 1 Junction board high voltage terminal (C) Test point 2 Body ground Test point 1 Junction board high voltage terminal (D) Test point 2 Body ground Is there 305 kΩ or less?
YES
NO
Go to step 16.
- Battery pack check 1
-1. Remove the junction board .
-2. Measure the voltage between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Test point 1 Battery pack high voltage terminal (A) Test point 2 Body ground Test point 1 Battery pack high voltage terminal (B) Test point 2 Body ground Is there 0V or less?
YES
NO
Go to step 17.
- Battery pack check 2
-1. Disconnect the following connectors.
Battery condition monitor module connector A (28P) Battery condition monitor module connector B (28P) Battery condition monitor module connector C (28P) Battery condition monitor module connector D (16P) Battery condition monitor module connector E (32P) Battery condition monitor module connector F (12P) -2. Measure the voltage between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Battery condition monitor module connector A (28P): disconnected Battery condition monitor module connector B (28P): disconnected Battery condition monitor module connector C (28P): disconnected Battery condition monitor module connector D (16P): disconnected Battery condition monitor module connector E (32P): disconnected Battery condition monitor module connector F (12P): disconnected Test point 1 Battery pack high voltage terminal (A) Test point 2 Body ground Test point 1 Battery pack high voltage terminal (B) Test point 2 Body ground Is there 0V or less?
YES
Replace the battery condition monitor module .
NO
Go to step 18.
- Battery pack check 3
-1. Disconnect the following connectors.
Battery module 1 28P connector Battery module 2 28P connector Battery module 3 28P connector Battery module 4 28P connector -2. Measure the voltage between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Battery condition monitor module connector A (28P): disconnected Battery condition monitor module connector B (28P): disconnected Battery condition monitor module connector C (28P): disconnected Battery condition monitor module connector D (16P): disconnected Battery condition monitor module connector E (32P): disconnected Battery condition monitor module connector F (12P): disconnected Battery module 1 28P connector: disconnected Battery module 2 28P connector: disconnected Battery module 3 28P connector: disconnected Battery module 4 28P connector: disconnected Test point 1 Battery pack high voltage terminal (A) Test point 2 Body ground Test point 1 Battery pack high voltage terminal (B) Test point 2 Body ground Is there 0V or less?
YES
NO