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Home >> Chevrolet >> 2015 >> Volt >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U183E >> Diagnostic Information and Procedures >> DTC P1EC1 or P1EC2: Battery Energy Control Module >> 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 includes the following steps:

  • 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.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

  • Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
  • Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
    • Visually and functionally inspect the gloves before use.
    • Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

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

NOTE: Use the schematics and connector end views to identify the devices' high voltage energy management communication enable circuit terminals.
  1. Vehicle OFF, disconnect the X357 harness connector at the A4 Hybrid/EV Battery Pack.
  2. Vehicle in Service Mode.
  3. Verify that a test lamp illuminates between the high voltage energy management communication enable circuit terminal 5 X357 and ground.
    • If the test lamp does not illuminate 
    1. Vehicle OFF, disconnect the X1 harness connector at the T18 Battery Charger, Vehicle in Service Mode.
    2. Verify a test lamp illuminates between the high voltage energy management communication enable circuit terminal 5 X357 at the A4 Hybrid/EV Battery Pack and ground.
      • If the test lamp illuminates, replace the T18 Battery Charger.
      • If the test lamp does not illuminate
    3. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    4. Test for infinite resistance between the high voltage energy management communication enable circuit terminal 5 X357 at the A4 Hybrid/EV Battery Pack and ground.
      • If less than infinite resistance, repair the short ground on the circuit.
      • If infinite resistance
    5. Test for less than 2 Ω in the high voltage energy management communication enable circuit end to end between the A4 Hybrid/EV Battery Pack terminal 5 X357 and the K114B Hybrid/EV Powertrain Control Module 2 terminal 48 X2.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • If the test lamp illuminates 
  4. Vehicle OFF, connect the X357 harness connector at the A4 Hybrid/EV Battery Pack.
  5. Perform the High Voltage Disabling procedure before proceeding with this diagnostic. Refer to High Voltage Disabling .
  6. Reconnect the 12 V battery.
  7. Vehicle OFF, connect the EL-50211 low voltage jumper harness extension.
  8. Disconnect the X1 harness connector at the K16 Battery Energy Control Module.
  9. Vehicle in Service Mode.
  10. Verify that a test lamp illuminates between the high voltage energy management communication enable circuit terminal 16 X1 at K16 Battery Energy Control Module and ground.
    • If the test lamp does not illuminate 

      Replace the Drive Motor Battery Wire Junction Block Relay.

    • If the test lamp illuminates 
  11. Replace the K16 Battery Energy Control Module.
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