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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2600-P2603: Auxiliary Coolant Pump >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON, verify that DTC P1485, P1486 or P1487, is not set.
  2. Command the cooling fan ON from 0 - 90% with a scan tool. Verify that the cooling fan turns ON and operates as commanded.
    NOTE: There is a slight delay before the cooling fan activates and reaches full speed.
  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

    • If Malfunction is not displayed 
  6. All OK.
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