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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 1.6L (LH7) Diesel) >> Diagnostic Information And Procedures >> DTC P25AC Or P25AD: Piston Cooling Oil Jet Stuck Off/On >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: B267 Piston Cooling Oil Pressure Switch
  3. Ignition - On/Vehicle - In Service Mode
  4. Test for battery voltage between the test points: Signal circuit terminal 1 & Ground
    • If less than battery voltage 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 1 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 ohms between the test points: Signal circuit terminal 1 @ Component harness & Terminal 12 X2 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K20 Engine Control Module
    • Go to next step: If battery voltage 
  5. Ignition/Vehicle - Off
  6. Disconnect the electrical connector: K20 Engine Control Module
  7. Ignition - On/Vehicle - In Service Mode
  8. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit. 
    • Go to next step: If less than 1 V 
  9. Test or replace the component: B267 Piston Cooling Oil Pressure Switch
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