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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 P3064 >> 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 Q35 Exhaust Heat Exchanger Exhaust Bypass Valve.
  2. Test for less than 5 Ω between the ground circuit terminal 3 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 in Service Mode.
  4. Test for B+ between the B+ circuit terminal 1 and the ground circuit terminal 3.
    • If less than B+ 
    1. Vehicle OFF, test for infinite resistance between the B+ circuit terminal 1 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 Q35 Exhaust Heat Exchanger Exhaust Bypass Valve.
    • Go to next step: If B+ 
  5. Test for 2 - 12V between the LIN serial data circuit terminal 2 and the ground circuit terminal 3.
    • If less than 2V 
    1. Ignition OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for infinite resistance between the LIN serial data circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the LIN serial data circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the Hybrid/EV Powertrain Control Module 2.
    • If Greater than 12V 
    1. Ignition OFF, disconnect the harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 1V between the LIN serial data circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If between 2 - 12V 
  6. Replace the Q35 Exhaust Heat Exchanger Exhaust Bypass Valve.
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