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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 P163A >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: G18 High Pressure Fuel Pump
  3. Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
  4. Ignition - On / Vehicle - In Service Mode
  5. Perform the scan tool control function: Fuel Pressure Regulator 1 - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp does not turn On and Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X3 @ K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • Control circuit terminal 1 @ Component harness & Ground
      • Control circuit 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 
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points:
      • Control circuit terminal 1 @ Component harness & Ground
      • Control circuit 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 
    7. Test for less than 2 ohms between the test points:
      • {G18 High Pressure Fuel Pump} Control circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness
      • {G18 High Pressure Fuel Pump} Control circuit terminal 2 @ Component harness & The other end of the circuit @ 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 
    8. Test for infinite resistance between the test points: Control circuit terminal 1 @ Component harness & Control circuit terminal 2 @ Component harness
      • If less than infinite resistance - Repair the short between the circuits. 
      • If infinite resistance - Replace the component:  K20 Engine Control Module
    • Go to next step: If the test lamp turns On and Off 
  6. Program the control module: K20 Engine Control Module
  7. Verify the DTC does not set.
    • If the DTC sets 

      Replace the component: K20 Engine Control Module

    • Go to next step: If the DTC is not set 
  8. All OK.
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