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DTC P0AFB: Hybrid battery voltage high
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
 
 
MONITOR EXECUTION
Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • EV-CAN monitor
  • Main drive lithium-ion battery voltage sense circuit monitor
  • Battery-CAN monitor
  • Front electric motor control unit (FEMCU) inverter voltage monitor
  • Rear electric motor control unit (REMCU) inverter voltage monitor
  • Generator control unit (GCU) inverter voltage monitor
Sensor (The sensor below is determined to be normal)
  • Front electric motor control unit (FEMCU) inverter voltage sensor
  • Rear electric motor control unit (REMCU) inverter voltage sensor
  • Generator control unit (GCU) inverter voltage sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
 
 
TROUBLE JUDGMENT
Check Conditions
  • When the vehicle is in the charging mode
Judgment Criterion
  • When a state with the voltage of each condenser (built in the FEMCU, GCU and REMCU) being more than 347 volts continues for 0.2 seconds while the main drive lithium-ion battery is being charged
  • When a state with the voltage of the main drive lithium-ion battery being more than 336 volts continues for 0.2 seconds while the main drive lithium-ion battery is being charged
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 8 .
 
 
PROBABLE CAUSES
  • Malfunction of the main drive lithium-ion battery.
  • Malfunction of the BMU.
  • Malfunction of the PHEV-ECU.
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the DTC is set in the BMU or on board charger/DC-DC converter (Refer to <BMU>, <On board charger/DC-DC converter>).
Is the DTC set?
Troubleshoot for the relevant DTC. Then go to Step 4.
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the other DTC is set in the PHEV-ECU (Refer to ).
Is the DTC set?
Troubleshoot for the relevant DTC. Then go to Step 4.
Go to Step 3.
 
STEP 3. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 8 .
(2) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ). Then go to Step 4.
The procedure is complete.
 
STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 8 .
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The inspection is complete.