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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446-DTC P31BF And Symptoms) >> Diagnostic Information and Procedures >> DTC P2600-P2603 >> Circuit/System Verification

Circuit/System Verification

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. Ignition ON, verify that DTC P1485, P1486, or P1487, is not set.
    2. NOTE:

    There is a slight delay before the cooling fan activates and reaches full speed.

  2. Command the cooling fan ON from 0 - 90 % with a scan tool. Verify that the cooling fan turns ON and operates as commanded.
  3. Ignition ON.
  4. Verify the KR33 Auxiliary Heater Coolant Pump Relay turns on and off/clicks when commanding the KR33 Auxiliary Heater Coolant Pump Relay On and Off with a scan tool
  5. Verify the parameters listed below do not display Malfunction when commanding the KR33 Auxiliary Heater Coolant Pump Relay ON and OFF On and Off with a scan tool
    • Auxiliary Coolant Pump Relay Control Circuit Open Test Status
    • Auxiliary Coolant Pump Relay Control Circuit Low Voltage Test Status
    • Auxiliary Coolant Pump Relay Control Circuit High Voltage Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing

    • Go to next step: If Malfunction is not displayed 
  6. All OK.
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