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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Hybrid/EV System Heating And Cooling) >> Diagnostic Information and Procedures >> DTC P0CEC: Hybrid/EV Electronics Coolant Pump Control Circuit >> Circuit/System Testing

Circuit/System Testing

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  1. Vehicle OFF, disconnect the harness connector at the G35 Hybrid/EV Electronics Coolant Pump.
  2. Test for less than 5 Ω between the ground circuit terminal 4 and ground.
    • If 5 Ω or greater 

      Repair the open/high resistance on the ground circuit.

    • If less than 5 Ω 
  3. Vehicle On.
  4. Test for B+ between the B+ circuit terminal 5 and the ground circuit terminal 4.
    • If less than B+ 
    1. Vehicle OFF, test for infinite resistance between the B+ circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω and the fuse is blown, replace the G35 Hybrid/EV Electronics Coolant Pump.
    • If B+ 
  5. Connect a test lamp between the enable circuit terminal 1 and the ground circuit terminal 4.
  6. Vehicle OFF, verify the test lamp is OFF.
    • If the test lamp is ON 
    1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 1 V between the pump enable circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K114B hybrid/EV powertrain control module 2.
    • If the test lamp is OFF 
  7. Vehicle On. Verify the test lamp illuminates. Command the Hybrid/EV Electronics Coolant Pump ON (20 - 90%) with a scan tool if necessary.
    • If the test lamp is OFF 
    1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for infinite resistance between the pump enable circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the pump enable circuit end to end.
      • If 2 Ω or greater, 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 is ON 
  8. Connect a test lamp between the control circuit terminal 3 and the B+ circuit terminal 5.
  9. Verify that a test lamp changes illumination between bright (20%) and dim (90%) when commanding the Hybrid/EV Electronics Coolant Pump ON between 20% and 90% with a scan tool.
    • If the test lamp is always dim or does not illuminate 
    1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 1 V between the control circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. 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 K114B Hybrid/EV Powertrain Control Module 2.
    • If the test lamp is always bright 
    1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    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 K114B Hybrid/EV Powertrain Control Module 2.
    • The test lamp changes illumination between bright (20%) and dim (90%) 
  10. Remove the test lamp.
  11. Verify the scan tool Hybrid/EV Electronics Coolant Pump Feedback parameter is 0%.
    • If greater than 0% 
    1. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for infinite resistance between the feedback circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • If 0% 
  12. Install a 3 A fused jumper wire between the feedback circuit terminal 2 and the ground circuit terminal 4.
  13. Verify the scan tool Hybrid/EV Electronics Coolant Pump Feedback parameter is greater than 90%.
    • If 90% or less 
    1. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 1 V between the feedback circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. 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 K114B Hybrid/EV Powertrain Control Module 2.
    • If greater than 90% 
  14. Replace the G35 Hybrid/EV Electronics Coolant Pump.
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