LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0010 To DTC P0442) >> Diagnostic Information And Procedures >> DTC P0128: Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature >> Component Testing

Component Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector : B34 Engine Coolant Temperature Sensor
  3. Test for 42 to 78, 834 Ω between the test points : Signal terminal 2/B & Low Reference terminal 1/A
    • If not between 42 to 78, 834 Ω 

      Replace the component : B34 Engine Coolant Temperature Sensor

    • Go to next step : If between 42 to 78, 834 Ω 
  4. Verify the value is within the range listed in the table : Temperature Versus Resistance - Engine Coolant Temperature Sensor
    • If not in the specified range 

      Replace the component : B34 Engine Coolant Temperature Sensor

    • Go to next step : If in the specified range 
  5. Test for infinite resistance between the test points : Each terminal of the component & The component's housing
    • If less than infinite resistance 

      Replace the component : B34 Engine Coolant Temperature Sensor

    • Go to next step : If infinite resistance 
  6. All OK.
scientia non olet · About LEMON Manuals