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Home >> Infiniti >> 2017 >> Q50 Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 245 (Hybrid Motor System (Diagnostic Trouble Codes (DTCS) P2122-P31FF And Circuit Diagnosis) (Hybrid)) >> DTC / Circuit Diagnosis >> Insulation Resistance >> Insulation Resistance

Insulation Resistance

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:

ELECTRIC_SHOCK Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance.

WARNING:
  • Be sure to remove the service plug in order to disconnect the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
  • The removed service plug must always be carried in a pocket of the responsible worker or placed in the tool box during the procedure to prevent the plug from being connected by mistake.
  • Be sure to wear insulating protective equipment before beginning work on the high voltage system.
  • Never allow workers other than the responsible person to touch the vehicle containing high voltage parts. To keep others from touching the high voltage parts, these parts must be covered with an insulating sheet except when using them.
  • Refer to HIGH VOLTAGE PRECAUTIONS .
CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise instructed in the Service Information. A malfunction may occur if this is not observed.

  1. PRECONDITIONING

    WARNING:

    Follow the instructions below before starting the procedure.

    1. Disconnect high voltage circuit. Refer to HOW TO DISCONNECT HIGH VOLTAGE .
    2. Check voltage in high voltage circuit. Refer to CHECK VOLTAGE IN HIGH VOLTAGE CIRCUIT .

    GO TO STEP 2  .

  2. CHECK HIGH VOLTAGE HARNESS INSULATION RESISTANCE

    Check insulation resistance of the high voltage harness with an insulation resistance tester (multi tester).

    Measurement point

    Vehicle installation state

    • Resistance between the harness connector terminal and body

    Only as for the harness

    • Resistance between the harness connector terminal and harness connector plastic
    • Resistance between the harness connector terminal and harness coating (a shield)
    CAUTION:
    • Be sure to check that a harness connector and harness coating (a shield) do not have a wound or the damage such as cracks, and change it when there is a wound or a crack.
    • Be sure to set the insulation resistance tester to 500V when performing this test. Using a setting higher than 500V can result in damage to the component being inspected.
    • Wait for 30 seconds until the value becomes stable.
    • Li-ion battery
      High voltage harness connector Resistance
      Connector Terminal
      LB40 28 More than 100 MΩ
      29
    • Battery junction box
      High voltage harness connector Resistance
      Connector Terminal
      LB31 27 More than 100 MΩ
      LB32 26
      LB37 29
      LB38 30
    • Electric compressor
      High voltage harness connector Resistance
      Connector Terminal
      H1 1 More than 100 MΩ
      2
      3
      4
    • Traction motor inverter
      High voltage harness connector Resistance
      Connector Terminal
      H2 49 More than 100 MΩ
      50
      51

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Replace high voltage harness with the malfunction.

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