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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 P16D7-P16D9 >> 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/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: K111 Fuel Pump Driver Control Module
  3. Verify a test lamp does not turn On between the test points: Control circuit terminal 2 & B+ terminal 7
    • If the test lamp turns On 
    1. Remove - Test Lamp
    2. Disconnect the electrical connector: X3 @
    3. Verify a test lamp does not turn On between the test points: Control circuit terminal 2 & B+ terminal 7
      • If the test lamp turns On - Repair the short to ground on the circuit.
      • Replace the component: - K20 Engine Control Module
    • Go to next step: If the test lamp does not turn On 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify a test lamp does not turn On between the test points: Control circuit terminal 2 & Ground terminal 22
    • If the test lamp turns On 
    1. Remove - Test Lamp
    2. Disconnect the electrical connector: X3 @ K20 Engine Control Module
    3. Verify a test lamp does not turn On between the test points: Control circuit terminal 2 & Ground terminal 22
      • If the test lamp turns On - Repair the short to voltage on the circuit.
      • If the test lamp does not turn On - Replace the component: K20 Engine Control Module
    • Go to next step: If the test lamp does not turn On 
  6. Verify a test lamp turns On between the test points: Control circuit terminal 2 & B+ terminal 7
    • If the test lamp does not turn On 
    1. Disconnect the electrical connector: X3 @ K20 Engine Control Module
    2. Test for less than 2 ohms between the test points: Control circuit terminal 2 @ K111 Fuel Pump Driver Control Module & Control circuit terminal 54 X3 @ K20 Engine Control Module
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K20 Engine Control Module
    • Go to next step: If the test lamp turns On 
  7. Replace the component: - K111 Fuel Pump Driver Control Module
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