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DTC No. P0C78-00 Hybrid/EV Battery System Precharge Time Too Long
 
 
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 A
  • 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: ON
  • EV power source relay drive signal: ON
Check Condition B
  • 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: ON
  • Drive battery current is less than 0.5A
  • EV power source relay drive signal: ON
Judgment Criterion A
  • When the following conditions are satisfied 3 times.
    • The value subtracting the front drive motor inverter voltage from the drive battery voltage before the start of charging is 70 volts or less.
    • The value subtracting the front drive motor inverter voltage from the drive battery voltage is more than 14 volts.
    • The value subtracting the rear drive motor inverter voltage from the drive battery voltage before the start of charging is 70 volts or less.
    • The value subtracting the rear drive motor inverter voltage from the drive battery voltage is more than 14 volts.
Judgment Criterion B
  • The value subtracting the front drive motor inverter voltage from the drive battery voltage before the start of charging is 70 volts or less.
  • The value subtracting the front drive motor inverter voltage from the drive battery voltage is more than 14 volts.
  • The value subtracting the rear drive motor inverter voltage from the drive battery voltage before the start of charging is 70 volts or less.
  • The value subtracting the rear drive motor inverter voltage from the drive battery voltage is more than 14 volts.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the junction box No. 2
  • Malfunction of the high voltage fuse
  • Malfunction of the resistor
  • Malfunction of the drive battery front cable
  • Malfunction of the drive battery rear cable (junction box)
  • Malfunction of the drive battery rear cable (rear motor)
  • 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
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
1.M.U.T.-IIISE other DTC
Check whether the PHEV-ECU sets the following DTC.
  • DTC No. P0AE6-00 Hybrid/EV Battery Precharge Contactor "A" Control Circuit Low
Is the DTC set?
Troubleshoot the set DTC (Refer to DTC No. P0AE6-00 Hybrid/EV Battery Precharge Contactor "A" Control Circuit Low). Then,
 
2.M.U.T.-IIISE other system DTC
Check whether the following high voltage system components set the DTC.
  • BMU
  • BMU2
  • 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?
<Vehicles with AC power supply function>
<Vehicles without AC power supply function>
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?
Replace the AC inverter (Refer to AC INVERTER REMOVAL AND INSTALLATION). Then,
 
5.Check of high voltage terminal (P, N line) of power drive unit
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) Shut off the high voltage circuit (Refer to PRECAUTIONS ON HOW TO USE THE HIGH-VOLTAGE VEHICLE).
(2) Check that the following cable is installed with the specified torque.
Is the check result normal?
Install the drive battery front cable with the specified torque (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION). Then,
 
6.Check of high voltage terminal of drive battery (front side)
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) Shut off the high voltage circuit (Refer to PRECAUTIONS ON HOW TO USE THE HIGH-VOLTAGE VEHICLE).
(2) Check that the following cable connector is connected properly.
Is the check result normal?
Properly connect the drive battery front cable connector (drive battery side) (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION). Then,
 
7.Visually check the drive battery front cable.
Visually check that there is no burnout, damage, foreign material on the cable between the drive battery and power drive unit.
Is the check result normal?
Replace the drive battery front cable (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION). Then,
 
8.Check of high voltage terminal (P, N line) of rear motor
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) Shut off the high voltage circuit (Refer to PRECAUTIONS ON HOW TO USE THE HIGH-VOLTAGE VEHICLE).
(2) Check that the following cable is installed with the specified torque.
Is the check result normal?
Install the drive battery rear cable (rear motor) with the specified torque (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION). Then,
 
9.Check of high voltage terminal of drive battery (rear side)
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) Shut off the high voltage circuit (Refer to PRECAUTIONS ON HOW TO USE THE HIGH-VOLTAGE VEHICLE).
(2) Check that the following cable is installed with the specified torque.
Is the check result normal?
Properly connect the drive battery rear cable (junction box) connector (drive battery side) (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION). Then,
 
10.Visually check the drive battery rear cable.
Visually check that there is no burnout, damage, foreign material on the cable between the drive battery and rear motor [drive battery rear cable (junction box), drive battery rear cable (rear motor)].
Is the check result normal?
Replace the drive battery rear cable (junction box) or drive battery rear cable (rear motor) (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION). Then,
 
11.Check of high voltage terminal of junction box
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) Shut off the high voltage circuit (Refer to PRECAUTIONS ON HOW TO USE THE HIGH-VOLTAGE VEHICLE).
(2) Check that the following cable is installed with the specified torque.
Is the check result normal?
Replace the drive battery rear cable (junction box) or drive battery rear cable (rear motor) (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION). Then,
 
12.Check bus bar for looseness.
(1) Disassemble the drive battery (Refer to SERVICE PROCEDURE).
(2) Check the looseness of bus bar inside the drive battery.
Is the check result normal?
Replace the junction box No. 2 (Refer to JUNCTION BOX NO.2 REMOVAL AND INSTALLATION). Then, go to
Repair or replace the bus bar (Refer to BATTERY UPPER PLATE AND BATTERY MODULE BUS BAR REMOVAL AND INSTALLATION). Then,
 
13.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.
 
14.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.