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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Hybrid/EV System Heating And Cooling) >> Diagnostic Information and Procedures >> DTC P0CC1-P0CC4: Generator Control Module Coolant Pump >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
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.

WARNING:

The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.

  1. Ignition OFF, disconnect the X2 harness connector at the K50A Fuse Block - Underhood.
  2. Connect a test lamp between the control circuit terminal 11 and B+, ignition ON.
  3. Verify the test lamp turns ON and OFF when commanding the Motor Coolant Pump Relay Enable ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K59 Starter/Generator Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF.
    4. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K59 Starter/Generator Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K59 Starter/Generator Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K59 Starter/Generator Control Module.
    • If the test lamp turns ON and OFF 
  4. Ignition OFF and all vehicle systems OFF, connect the X2 harness connector at the K50A Fuse Block - Underhood. Disconnect the harness connector at the G43 Starter/Generator Coolant Pump. It may take up to 2 minutes for all vehicle systems to power down.
  5. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  6. Connect a test lamp between the control circuit terminal 1 and ground.
  7. Verify the test lamp turns ON and OFF when commanding the Motor Coolant Pump Relay Enable ON and OFF with a scan tool.
    • If the test lamp is always OFF and the circuit fuse is good 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X50A Fuse Block - Underhood.
    • If the test lamp is always OFF and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the G43 Starter/Generator Coolant Pump.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X50A Fuse Block - Underhood.
    • If the test lamp turns ON and OFF 
  8. Test or replace the G43 Starter/Generator Coolant Pump.
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