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Home >> Chevrolet >> 2013 >> Volt >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U1846 >> Diagnostic Information and Procedures >> DTC P1EF8 >> Circuit/System Testing

Circuit/System Testing

WARNING:

The Volt Battery Pack will utilize an exchange program. Please consult the most recent revision of bulletin/PI #PIP4841, available in Service Information (SI), for a list of approved Volt Battery Pack service procedures. Components that may be removed and serviced without exchanging the complete battery pack are identified in the bulletin/PI. Please contact the GM Technical Assistance Center if you have any questions.

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 X1 harness connector at the T18 Battery Charger.
  2. Vehicle in Service Mode.
  3. Verify that a test lamp illuminates between the high voltage energy management communication enable circuit terminal G X1 and ground.
    • If the test lamp does not illuminate, test the circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • If the test lamp does not illuminate 
    1. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack, Vehicle in Service Mode.
    2. Verify a test lamp illuminates between the high voltage energy management communication enable circuit terminal G X1 at the T18 Battery Charger and ground.
      • If the test lamp illuminates, replace the K16 Battery Energy Control Module.
      • 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 G X1 at the T18 Battery Charger 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 T18 Battery Charger terminal G X1 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. Replace the T18 Battery Charger.
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