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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0231, P0232, or P023F (Chassis Control Module) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:
    • An empty fuel tank or a defective fuel pump may cause DTCs to set.
    • If set only as a history DTC, do not replace any component.
    • Verify the fuel tank is not empty before proceeding.
    • It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: A7 Fuel Pump and Level Sensor Assembly
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 2 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K38 Chassis Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 2 @ Component harness & Terminal 38 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K38 Chassis Control Module
    • Go to next step: If less than 10 ohms 
  4. Connect a test lamp between the test points: Control circuit terminal 1 & Low Reference circuit terminal 2
  5. Ignition - On / Vehicle - In Service Mode
  6. Perform the scan tool control function: Fuel Pump Enable Command @ Engine Control Module - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K38 Chassis Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control circuit terminal 1 @ Component harness & Terminal 13 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K38 Chassis Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K38 Chassis 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
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K38 Chassis Control Module
    • Go to next step: If the test lamp turns On and Off 
  7. Test or replace the component: A7 Fuel Pump and Level Sensor Assembly
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