AIR CONDITIONING SYSTEM, Diagnostic DTC:P1C7C49

DTC Code DTC Name
P1C7C49 Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure

DESCRIPTION

This DTC is stored if there is insulation malfunction in the high-voltage circuit in the air conditioning system. Possible causes are poor insulation in the compressor with motor assembly, or mixing of any oil other than ND-OIL 11 in the refrigerant cycle.

A high-voltage motor is built into the compressor with motor assembly and is cooled directly with refrigerant. Compressor oil (ND-OIL 11) with high insulation performance is used because leakage of electrical power may occur if regular compressor oil (ND-OIL 8) is used.

CAUTION:


  • Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
P1C7C49 Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure High voltage system insulation malfunction

  • Compressor oil

  • Refrigerant pipe line

  • Compressor with motor assembly

  • CAN communication system

 Memorized

WIRING DIAGRAM

B006ITUE02

CAUTION / NOTICE / HINT

CAUTION:


  • Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

Note


  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here

  • Electrical insulation performance may decrease significantly if even a small amount of oil other than ND-OIL 11 is used (or enters) in the refrigerant cycle, causing a DTC to be output.

  • If oil other than ND-OIL 11 is accidentally used and a DTC is output, collect as much of the oil in the refrigerant cycle into the compressor with motor assembly as possible and replace it with ND-OIL 11 to increase the ND-OIL 11 ratio.

  • Replace the main components of the refrigerant cycle (evaporator, condenser, and compressor) if a large amount of oil other than ND-OIL 11 enters the system. Failing to do so may cause electrical insulation performance to remain low, causing a DTC to be stored.

  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs for both systems are output simultaneously.

Tech Tips

If it can be confirmed that any compressor oil other than ND-OIL 11 has been used, replace the main components of the refrigerant cycle.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      Click here

      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY

    CAUTION:

    Because the compressor with motor assembly has a high-voltage circuit, put on insulated gloves and remove the service plug grip to cut off the high-voltage circuit before inspecting the compressor with motor assembly.


    1. Clear the DTCs.

      Click here


      Powertrain > Hybrid Control > Clear DTCs

    2. Turn the power switch on (READY).

    3. Prepare the vehicle according to the table below for 3 minutes.

      Item Condition
      Blower speed HI
      Temperature setting MAX COLD
      A/C switch On

    4. Turn the power switch off.

    5. Remove the service plug grip.

      Click here

      CAUTION:

      Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

      Note

      After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed.

    6. B006HX6C02
      *a

      Component without harness connected

      (Compressor with Motor Assembly)

      Disconnect the compressor with motor assembly connector.

    7. Using a megohmmeter, measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (PE) - Body ground Always 2 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    OK

  3. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY

    B006HX6C03
    *a

    Component without harness connected

    (Compressor with Motor Assembly)

    CAUTION:

    Because the compressor with motor assembly has a high-voltage circuit, put on insulated gloves and remove the service plug grip to cut off the high-voltage circuit before inspecting the compressor with motor assembly.


    1. Using a megohmmeter, measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (PB) - Body ground Always 2 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    OK

  4. INSPECT REFRIGERANT CYCLE

    CAUTION:

    Because the compressor with motor assembly has a high-voltage circuit, put on insulated gloves and remove the service plug grip to cut off the high-voltage circuit before inspecting the compressor with motor assembly.


    1. Reconnect the compressor with motor assembly connector.

    2. Install the service plug grip.

      Click here

    3. Turn the power switch on (READY).

    4. Set the A/C temperature to 25°C (77°F) and blower speed to LO and operate the compressor with motor assembly for 10 minutes to circulate the refrigerant and collect as much compressor oil as possible in the compressor with motor assembly.

    5. Turn the power switch off.

    6. Using a spot cooler or other tool, cool down the compressor with motor assembly for 30 minutes, or leave the vehicle overnight before inspection.

      Note

      Do not operate the compressor before inspection.

    7. Remove the service plug grip.

      Click here

      CAUTION:

      Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

      Note

      After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed.

    8. B006HX6C02
      *a

      Component without harness connected

      (Compressor with Motor Assembly)

      Disconnect the compressor with motor assembly connector.

    9. Using a megohmmeter, measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (PE) - Body ground Always 3 MΩ or higher

      Note

      If the result is not as specified, replace the compressor without operating it.

      Result
      Result Proceed to
      OK A
      NG (for HFC-134a (R134a)) B
      NG (for HFO-1234yf (R1234yf)) C

    B

    REPLACE MAIN COMPONENTS OF REFRIGERANT CYCLE Click here

    C

    REPLACE MAIN COMPONENTS OF REFRIGERANT CYCLE Click here

    A

  5. INSPECT REFRIGERANT CYCLE

    B006HX6C03
    *a

    Component without harness connected

    (Compressor with Motor Assembly)

    CAUTION:

    Because the compressor with motor assembly has a high-voltage circuit, put on insulated gloves and remove the service plug grip to cut off the high-voltage circuit before inspecting the compressor with motor assembly.


    1. Using a megohmmeter, measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (PB) - Body ground Always 3 MΩ or higher

      Note

      If the result is not as specified, replace the compressor without operating it.

      Result
      Result Proceed to
      OK A
      NG (for HFC-134a (R134a)) B
      NG (for HFO-1234yf (R1234yf)) C

    A

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    B

    REPLACE MAIN COMPONENTS OF REFRIGERANT CYCLE Click here

    C

    REPLACE MAIN COMPONENTS OF REFRIGERANT CYCLE Click here