LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (Engine Controls And Fuel - 3.6L (LGX) - Diagnostic Information And Procedures (P0449-P3436) And Symptoms) >> Diagnostic Information and Procedures >> DTC P157A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition Off, disconnect the harness connector at the K111 Fuel Pump Driver Control Module.
  2. Ignition On.
  3. Test for greater than 11 V between control circuit terminal 2 at the K111 Fuel Pump Driver Control Module harness connector and ground.
    • If 11 V or greater

      Replace the K111 Fuel Pump Driver Control Module

    • Go to next step: If less than 11 V
  4. Ignition Off, disconnect the harness connector: X3 at the K20 Engine Control Module.
  5. Test for less than 1 V between control circuit terminal 2 at the K111 Fuel Pump Driver Control Module harness connector and ground.
    • If 1 V or greater, repair the short to voltage on the circuit
    • Go to next step: If less than 1 V
  6. Test for infinite resistance between control circuit terminal 2 at the K111 Fuel Pump Driver Control Module harness connector and ground.
    • If less than infinite resistance, repair the short to ground on the circuit
    • Go to next step: If infinite resistance
  7. Test for less than 2 Ω between test points: terminal X3-10 at the Engine Control Module harness and terminal 2 at the K111 Fuel Pump Driver Control Module harness.
    • If 2 Ω or greater, repair the open/high resistance in the circuit
    • Go to next step: If less than 2 Ω

      Go to next step: Replace the K20 Engine Control Module.

scientia non olet · About LEMON Manuals