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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P205B - P2BAA) And Symptoms) >> Diagnostic Information And Procedures >> Malfunction Indicator Lamp (MIL) Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the appropriate harness connector at the P16 Instrument Cluster. Ignition ON.
  2. Verify a test lamp illuminates between the Ignition voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition voltage circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test all components connected to the ignition voltage circuit and replace as necessary.
    • Go to next step: If the test lamp illuminates 
  3. Ignition OFF, disconnect the appropriate harness connector at the P16 Instrument Cluster.
  4. Ignition ON, command the malfunction indicator lamp OFF with a scan tool.
  5. Verify that a test lamp does not illuminate between the X1 harness connector ignition circuit terminal 1 and the X1 harness connector control circuit terminal 18.
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the X1 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.
    • Go to next step: If the test lamp does not illuminate 
  6. Ignition ON, command the malfunction indicator lamp ON with a scan tool.
  7. Verify that a test lamp does illuminate between the X1 harness connector ignition circuit terminal 1 and the X1 harness connector control circuit terminal 18.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Ignition ON.
    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. Test for less than 2 Ω in 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.
    • Go to next step: If the test lamp is ON 
  8. Test or replace the P16 Instrument Cluster.
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