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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 81 (Engine Controls And Fuel - 1.6L (LWC) - DTC P0243 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2600-P2603 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect and remove the KR33 Auxiliary Heater Coolant Pump Relay.
  2. Test for 70 - 110 Ω between terminals 85 and 86.
    • If less than 70 Ω or greater than 110 Ω 

      Replace the KR33 Auxiliary Heater Coolant Pump Relay

    • Go to next step: If between 70 - 110 Ω 
  3. Test for infinite resistance between the terminals listed below:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If less than infinite resistance 

      Replace the KR33 Auxiliary Heater Coolant Pump Relay

    • Go to next step: If infinite resistance 
  4. Install a 3 A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground.
  5. Test for less than 2 Ω between terminals 30 and 87
    • If 2 Ω or greater 

      Replace the KR33 Auxiliary Heater Coolant Pump Relay

    • Go to next step: If less than 2 Ω 
  6. All OK
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