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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P040B - P204D)) >> Diagnostic Information And Procedures >> DTC P1048, P1049, P2047, P2048, Or P2049: Reductant Injector Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the Q61 Reductant Injector.
  2. Ignition ON, test for 2 - 3 V between the reductant injector low control circuit terminal 2 and ground.
    • If less than 2 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω between the test points: Terminal 1 @ Q61 Reductant injector Component harness & Terminal 1 X3 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    3. Test for infinite resistance between the Q61 Reductant Injector harness terminal 1 and ground.
    • If less than infinite resistance, repair the short to ground in the circuit.
    • If infinite resistance, replace the K20 Engine Control Module.
    • If greater than 3 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, Ignition ON.
    2. Test for less than 1.0 V between Q61 Reductant Injector harness low control circuit terminal 1 and ground.
      • If greater than 1.0 V, repair the short to voltage at the circuit.
      • If less than 1.0 V, replace the K20 Engine Control Module.
    • Go to next step: If between 2 - 3 V 
  3. Connect a test lamp between the Q61 Reductant Injector low control circuit harness terminal 1 and the Q61 Reductant Injector high control circuit harness terminal 2
  4. Ignition ON, verify a test lamp flashes several times while commanding the Reductant Injector on with a scan tool.
    • If the test lamp is always off 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω between Q61 Reductant Injector harness high control circuit terminal 2 to K20 Engine Control Module X3 harness connector terminal 1.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    3. Test for infinite resistance between the Q61 Reductant Injector harness reductant injector high control circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Ignition ON, test for less than 1.0 V between the Q61 Reductant Injector harness high control circuit terminal 2 and ground.
      • If greater than 1.0 V, repair the short to voltage at the circuit.
      • If less than 1.0 V, replace the K20 Engine Control Module.
    • Go to next step: If the test lamp flashes 
  5. Refer to Component Testing 
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