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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 278 (Engine Controls And Fuel - 3.6L (LGX LF4) - DTC P0117 (LGX) To DTC P0697) >> Diagnostic Information and Procedures >> DTC P0182, P0183, P0187, P0188, P0191, P0192, P111F, P126E, P126F, P127C, P128A-P128D, P128F, P16E4, or P16E5: Fuel Temperature Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    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:B47B Fuel Rail Pressure Sensor
  3. Test for less than 10 Ω between the test points:Low Reference circuit terminal 1 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector:X3@K20 Engine Control Module
    2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 1 @Component harness & Terminal 41 @Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω» Replace the component:K20 Engine Control Module
    • If less than 10Ω 
  4. Ignition » On / Vehicle » In Service Mode
  5. Test for 4.8 to 5.2 V between the test points: 5V Reference circuit terminal 3& Low Reference circuit terminal 1
    • If less than 4.8 V 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:X3@K20 Engine Control Module
    3. Test for infinite resistance between the test points:5V Reference circuit terminal 3 @Component harness & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: 5V Reference circuit terminal 3@Component harness & Terminal 40 @Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:K20 Engine Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:X3@K20 Engine Control Module
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:5V Reference circuit terminal 3 @Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K20 Engine Control Module
    • If between 4.8 and 5.2 V 
  6. Test for 4.8 to 5.2 V between the test points:Signal circuit terminal 2 & Low Reference circuit terminal 1
    • If less than 4.8 V 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector: X3@K20 Engine Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 2 @Component harness & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points:Signal circuit terminal 2 @Component harness & Terminal 60 @Control module harness
      • If 2 Ω ; or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:K20 Engine Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector: X3 @K20 Engine Control Module
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 2@Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K20 Engine Control Module
    • If between 4.2 and 5.2 V 
  7. Test or replace the component:B47B Fuel Rail Pressure Sensor
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