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Home >> Chevrolet >> 2017 >> Volt Premier >> Repair and Diagnosis >> Electrical >> Charging Systems >> Plug-In Charging System >> Diagnostic Information and Procedures >> DTC P0D26: Battery Charger System Precharge Time Too Long >> Circuit/System Testing

Circuit/System Testing

    WARNING:

    Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

    The High Voltage Disabling procedure will perform the following tasks:

    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Failure to follow the procedures exactly as written may result in serious injury or death.

  1. Disable the high voltage for servicing at the A4 Battery Pack, K1 14V Power Module and the T18 Battery Charger. Refer to High Voltage Disabling .
  2. Disconnect the X3 connector at the T18 Battery Charger, the X4 connector at the K1 14V Power Module and the X6 connector at the A4 Battery Pack.
  3. Verify that all HV harness connector and mating module connector terminals are free from moisture, corrosion and arc flash damage.
    • If any terminals show signs of damage 

      Replace the HV wiring harness and effected modules as necessary.

    • If no arc flash damage, moisture, or corrosion is found 
  4. Test the following HV harness terminals for less than 2 Ω end to end:
    • X6-1 to X3-1
    • X6-1 to X4-B
    • X6-2 to X3-2
    • X6-2 to X4-A
    • If 2 Ω or greater 

      Replace the HV wiring harness.

    • If less than 2 Ω 
  5. Remove the T18 Battery Charger 15A fuse from the A4 Battery Pack. Refer to High Voltage Battery Disconnect Relay Fuse Replacement (Front - BDU)High Voltage Battery Disconnect Relay Fuse Replacement (Rear - BDU) for Front-BDU.
  6. Test the battery charger 15A fuse for an open condition.
    • If the fuse is open 
      NOTE:

      The HV harness must remain disconnected from all modules.

    1. Test the HV harness terminals X6-1 to X6-2 for infinite resistance.
      • If less than infinite resistance, replace the fuse and the HV wiring harness.
      • If infinite resistance
      2. NOTE:

      This test is performed at the module terminals with the test measurement initially several Meg ohms and slowly decreasing to a minimal value.

    2. Test the K1 14 V Power Module X4 terminals for greater than 10K Ω, X4-A to X4-B.
      • If 10K Ω or less, replace the K1 14V Power Module and the fuse.
      • If greater than 10 K Ω
      3. NOTE:

      This test is performed at the module terminals with the test measurement initially several Meg ohms and slowly decreasing to a minimal value.

    3. Test the T18 Battery Charger terminals for greater than 10K Ω, X3-1 to X3-2.
      • If 10K Ω or less, replace the T18 Battery Charger and the fuse.
      • If greater than 10 K Ω
    4. Replace the T18 Battery Charger and the fuse, reassemble the vehicle, clear DTCs and repeat Circuit/System Verification.
      • If Circuit/System Verification is not OK, replace the A28 Hybrid/EV Battery Contactor Assembly.
      • If Circuit/System Verification is OK, all OK.
    • If the fuse is OK 
  7. Reinstall the fuse. Replace the T18 Battery Charger, reassemble the vehicle, clear DTCs and repeat Circuit/System Verification.
    • If Circuit/System Verification is not OK 

      Replace the A28 Hybrid/EV Battery Contactor Assembly.

    • If Circuit/System Verification is OK 
  8. All OK.
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