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DTC No. P0AA4-00 Hybrid/EV Battery Negative Contactor Circuit Stuck Closed
 
 
danger
 
 
MONITOR EXECUTION
Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Condition
  • Drive battery precharge contactor control circuit activation command: ON
  • Drive battery positive contactor control circuit activation command: OFF
  • Drive battery negaitive contactor control circuit activation command: OFF
  • EV power source relay drive signal: ON
Judgment Criterion
  • The change of the input voltage of the power drive unit is more than 60 volts for 0.4 second or more.
  • The change of the input voltage of the REMCU is more than 60 volts for 0.4 second or more.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the junction box No. 2
  • Malfunction of the A/C compressor
  • Malfunction of the On Board Charger (OBC)/DC-DC converter
  • Malfunction of the power drive unit
  • Malfunction of the REMCU
  • Malfunction of the AC inverter <Vehicle with AC power supply function>
  • Malfunction of the PHEV-ECU
 
 
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.M.U.T.-IIISE other DTC
Check whether the PHEV-ECU sets the following DTC.
  • DTC No. P0AE0-00 Hybrid/EV Battery Negative Contactor Control Circuit High
Is the DTC set?
Troubleshoot the set DTC (Refer to DTC No. P0AE0-00 Hybrid/EV Battery Negative Contactor Control Circuit High). Then,
 
2.M.U.T.-IIISE other system DTC
Check whether the following high voltage components set the DTC.
  • On Board Charger (OBC)
  • DC-DC converter
  • PHEV A/C amplifier
  • Power drive unit
  • REMCU
Is the DTC set?
Troubleshoot the set DTCs. Then,
 
3.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
<Vehicle with AC power supply function>
<Vehicle without AC power supply function>Disassemble the drive battery (Refer to SERVICE PROCEDURE). After the disassembly, replace the junction box No. 2 (Refer to JUNCTION BOX NO.2 REMOVAL AND INSTALLATION). Then,
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).
 
4.AC inverter check
danger
  • Carry out the check on the high voltage circuit while reading carefully the precautions on handling a high voltage vehicle.
  • Be sure to wear the specified protective equipment when checking the high voltage circuit.
(1) Disconnect the high voltage cable between the junction box and AC inverter.
(2) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(3) Check the DTC.
Is the DTC set?
Disassemble the drive battery (Refer to SERVICE PROCEDURE). After the disassembly, replace the junction box No. 2 (Refer to JUNCTION BOX NO.2 REMOVAL AND INSTALLATION). Then,
Replace the AC inverter (Refer to AC INVERTER REMOVAL AND INSTALLATION). Then,
 
5.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to PHEV-ECU REMOVAL AND INSTALLATION). Then,
The procedure is complete.
 
6.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.