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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls And Fuel - 2.5L (LCV) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P157A or P16D7-P16D9 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: K111 Fuel Pump Driver Control Module
  3. Test for infinite resistance between the test points: Terminal 2 @ Component harness & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  4. Disconnect the electrical connector: X3 @ K20 Engine Control Module
  5. Test for less than 1 V between the test points: Terminal 2 @ Component harness & 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 less than 2 ohms between the test points: Terminal 2 @ Component harness & Control circuit terminal 3 @ Control module harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  7. Replace the component: K20 Engine Control Module
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