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

Circuit/System 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. Verify the ignition fuse that supplies voltage to the component is not open: P16 Instrument Cluster
    • If the fuse is open 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: P16 Instrument Cluster
    3. Test for infinite resistance between the test points: Ignition circuit terminal 31 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: P16 Instrument Cluster
    • Go to next step: If the fuse is not open 
  2. Ignition/Vehicle - Off
  3. Disconnect the appropriate electrical connector: K20 Engine Control Module
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the component works as specified: Malfunction Indicator Lamp (MIL) = Off
    • If the component does not work as specified 
    1. Ignition/Vehicle - Off
    2. Test for infinite resistance between the test points: Control circuit terminal 71 X1 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: P16 Instrument Cluster
    • Go to next step: If the component works as specified 
  6. Ignition/Vehicle - Off
  7. Connect a 3 A fused jumper wire between the test points: Control circuit terminal 71 X1 & Ground
  8. Ignition - On / Vehicle - In Service Mode
  9. Verify the component works as specified: Malfunction Indicator Lamp (MIL) = On
    • If the component does not work as specified 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the appropriate electrical connector: P16 Instrument Cluster
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 71 X1@Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Control circuit terminal 25@Component harness & The other end of the circuit@Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 ohms
    7. Test for less than 2 ohms between the test points: Ignition circuit terminal 31@Component harness & Output terminal@Fuse
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • If less than 2 ohms - Replace the component: P16 Instrument Cluster
    • Go to next step: If the component works as specified 
  10. Replace the component: K20 Engine Control Module
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