Code No. P0AFA: Drive battery system (low voltage)



danger
  • When servicing the high voltage system parts, always shut off the high voltage by removing the service plug (Refer to ).
  • When servicing the high voltage system parts, always wear the protective equipment or armour to measure the high voltage (Refer to ).
caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).

TROUBLE JUDGEMENT


The PHEV-ECU stores diagnosis code No. P0AFA when the drive battery system fails.

PROBABLE CAUSES



  • The high-voltage circuit fails.
  • Blown high-voltage fuse
  • Main contactor energisation circuit fails
  • Malfunction of main contactor
  • Malfunction of front EMCU

DIAGNOSIS PROCEDURE


STEP 1. Check the signal line for short circuit (PHEV-ECU connector and drive battery connector).



  • Check the wiring harness between PHEV-ECU(CNTP, CNT+, CNT- terminals) connector and the drive battery connector.

Q. Is the check result normal?

Go to Step 2.
Repair the connector or wiring harness.

STEP 2. Checking coil resistance of contactor


Refer to .

Q. Is the check result normal?

Go to Step 3.
Replace the contactor. Then go to Step 3.

STEP 3. Check the high-voltage fuse.


danger Carry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle.
danger Wear the specified protection equipment during the check.
Refer to .

Q. Is the check result normal?

Go to Step 5.
Replace the high-voltage fuse (Refer to ). Then go to Step 4.

STEP 4. M.U.T.-III other system diagnosis code


Use M.U.T.-III to check whether the front and rear EMCU, GCU -related diagnosis code is stored. (Refer to .)

Q. Is any diagnosis code stored?

Troubleshoot for the relevant diagnosis code.
Go to Step 8.

STEP 5. Check the high-voltage circuit.


danger Carry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle.
danger Wear the specified protection equipment during the check.
Check whether the high-voltage wiring harness is connect securely or damaged.

  • Check whether the high-voltage wiring harness is connect securely.

Q. Is the check result normal?

Go to Step 6.
Replace the drive battery assembly (Refer to ). Then go to Step 7.

STEP 6. Check the high-voltage circuit.


danger Carry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle.
danger Wear the specified protection equipment during the check.
(1)Disconnect the drive battery connector, and then apply a voltage of 12 V to the energisation circuit terminal (CNT+, CNT-, CNTP terminal of the drive battery connector) of the respective contactor (main contactor (P), main contactor (N) or charging contactor) to turn on the respective contactor.
(2)Measure the voltage between the terminals at the service plug.
OK: Approximately 75 - 145 V

Q. Is the check result normal?

Go to Step 8.
Go to Step 7.

STEP 7. Check the high-voltage circuit in the battery pack.


danger Carry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle.
danger Wear the specified protection equipment during the check.
Check whether the high-voltage wiring harness in the battery pack is connect securely or damaged.
(1)Check whether the high-voltage wiring harness is connect securely.
(2)Check the voltage in the module.

Q. Is the check result normal?

Go to Step 8.
Replace the drive battery assembly (Refer to ). Then go to Step 8.

STEP 8. Check whether the diagnosis code is stored again.


Recheck if the diagnosis code is stored.
(1)Erase the diagnosis code.
(2)Turn on the power supply mode of the electric motor switch.
(3)Check if the diagnosis code is stored.

Q. Is the diagnosis code stored?

Return to Step 1.
The procedure is complete.