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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P163A: Control Module Fuel Pressure Regulator 1 Control System Circuitry Performance >> 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 OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump.
  2. Test for 0.34 - 0.44 Ω at 20°C (68°F) between the low control circuit terminal 2 and the high control circuit terminal 1.
    NOTE: The DMM and test leads must be calibrated to 0 Ω in order to prevent misdiagnosis.
    • If not within the specified range 

      Replace the G18 High Pressure Fuel Pump.

    • Go to next step: If within the specified range 
  3. Test for infinite resistance between each terminal and the G18 High Pressure Fuel Pump housing.
    • If less than infinite resistance 

      Replace the G18 High Pressure Fuel Pump.

    • Go to next step: If infinite resistance 
  4. All OK.
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