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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 353 (Engine Controls And Fuel - 2.5L (LCV) - DTC P0010 To DTC P0366) >> Diagnostic Information and Procedures >> DTC P0182, P0183, P0187, P0188, P111F, P126E, or P126F: Fuel Temperature Sensor/Fuel Rail Temperature Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. 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: B310 Fuel Pressure/Temperature 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 10 Ω 
  4. Ignition On/Vehicle In Service Mode
  5. Test for 4.8 to 5.2 V between the test points: 5 V 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: 5 V 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: 5 V 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: 5 V 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 and 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 4.8 and 5.2 V 
  7. Test or replace the component: B310 Fuel Pressure/Temperature Sensor
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