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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Battery, Starting System And Charging System) >> Diagnostic Information and Procedures >> Starter Malfunction >> Circuit/System Verification

Circuit/System Verification

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.
  1. Ignition - On / Vehicle - In Service Mode
    2. NOTE:

    Steps 2 and 3 are for vehicles equipped with a push button ignition switch. If the vehicle is not equipped with a push button ignition switch, continue to step 4.

  2. Brake Pedal - Applied

    Verify the scan tool parameter: Brake Pedal Position Sensor.=Active

    • If not the specified value 

      Refer to Stop Lamps Malfunction for diagnosis of the B22 Brake Pedal Position Sensor.

    • Go to next step: If the specified value 
  3. Brake Pedal - Released

    Verify the scan tool parameter: Brake Pedal Position Sensor.=Inactive

    • If not the specified value 

      Refer to Stop Lamps Malfunction for diagnosis of the B22 Brake Pedal Position Sensor.

    • Go to next step: If the specified value 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify that no DTCs are set.
    • Go to next step: If no DTC is set 
  6. {If available}Verify the scan tool parameter: Park/Neutral Position Switch=Park
    • Go to next step: If the specified state 
  7. Ignition - Crank

    Verify the scan tool parameter:

    1. { Without BTM }5V Ignition Switch=Crank Request
    2. Accessory=Inactive
    3. { With BTM }Engine Control Module - Power Mode=Crank Request
    • Go to next step: If the specified state 
  8. Verify the scan tool parameter: Crankshaft Position Active Counter=Does not Increment
    • If the parameter value increments 

      Replace the component: B26 Crankshaft Position Sensor

    • Go to next step: If the parameter value does not increment 
  9. Verify the component works as specified: Engine - Rotate(s)
    • If the component does not work as specified 

      Verify the following conditions do not exist:

    1. Accessory drive belt component - Seized
    2. Engine - Seized
    • Go to next step: If the component works as specified 
  10. Ignition - Crank

    Verify the component works as specified:

    • M64 Starter Motor=Activated - Rotate(s)
    • Engine=Cranking
    • {M64 Starter Motor Rotate(s) & Starter Pinion Clicks}If the component does not work as specified 

      Refer to: Circuit/System Testing

    • Go to next step: If the component works as specified 
  11. All OK.
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