If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus
lines.
OPERATION
BMU communicates with EV-ECU via CAN.
DIAGNOSIS CODE SET CONDITIONS
If the quick charging continues for the maximum quick
charging time of 2 minutes or longer, the diagnosis code No. P1AFB will be set.
PROBABLE CAUSES
Malfunction of the BMU
Malfunction of the EV-ECU
Malfunction of the main battery
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .)
Then go to Step 2.
STEP 2. Diagnosis code recheck after resetting CAN bus lines
Check again if the diagnosis code No. P1AFB is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Go to Step 3.
This diagnosis is complete.
STEP 3. M.U.T.-III data list
Check the BMU service data. (Refer to .)
Item No. 3 : Maximum cell voltage
Item No. 5 : Minimum cell voltage
Item No. 8 : Module maximum temperature
Item No. 10 : Minimum module temperature
Q.
Is the check result normal?
Go to Step 4.
Replace the BMU. (Refer to .) Then go to Step
6.
STEP 4. M.U.T.-III data list
Check the BMU service data. (Refer to .)
Item No. 8 : Module maximum temperature
Item No. 10 : Minimum module temperature
Item No. 33 : Maximum value of cell voltage difference
OK: The difference between the maximum module temperature and minimum temperature
is 40°C or less, the maximum cell voltage difference value is 0.3 V or less.
Q.
Is the check result normal?
Go to Step 5.
Replace the main battery. (Refer to .) Then go
to Step 6.
STEP 5. Diagnosis code recheck
Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the EV-ECU. (Refer to .) Then go to
Step 6.
The diagnosis is complete.
STEP 6. Diagnosis code recheck
Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting 
.)
Then go to Step 2.