LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Hybrid/EV System Heating And Cooling) >> Diagnostic Information and Procedures >> DTC P0CED, P1F44, or P1F45 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  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.

    • Go to next step: 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.
      • Go to next step: 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.
    • Go to next step: 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. Vehicle On.
    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 
  8. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    1. Test for infinite resistance between the pump enable circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    2. 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.
    • Go to next step: If the test lamp is ON 
  9. Connect a test lamp between the control circuit terminal 3 and the B+ circuit terminal 5.
  10. Verify the 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.
      • Go to next step: 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.
    • Go to next step: The test lamp changes illumination between bright (20%) and dim (90%) 
  11. Remove the test lamp.
  12. 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.
    • Go to next step: If 0% 
  13. Install a 3 A fused jumper wire between the feedback circuit terminal 2 and the ground circuit terminal 4.
  14. 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.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the feedback 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.
    • Go to next step: If greater than 90% 
  15. Replace the G35 Hybrid/EV Electronics Coolant Pump.
scientia non olet · About LEMON Manuals