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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 P0650, P263A or P263B: Malfunction Indicator Lamp (MIL) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Vehicle OFF, disconnect the X1 harness connector at the P16 Instrument Cluster, vehicle in Service Mode.
  2. Verify a test lamp illuminates between the control circuit terminal 16 and B+ when commanding the Malfunction Indicator Lamp (MIL) On and Off with a scan tool.
    • If the test lamp is always ON 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module.
    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 K20 Engine Control Module.
    • If the test lamp is always OFF 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module, vehicle in Service Mode.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V.
    3. Vehicle OFF.
    4. Test for less than 2 Ω between 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 K20 Engine Control Module.
    • If the test lamp turns ON and OFF 
  3. Replace the P16 Instrument Cluster.
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