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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0010 To DTC P0442) >> Diagnostic Information And Procedures >> DTC P0335 Or P0336: Crankshaft Position Sensor >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle & All vehicle systems - Off
    NOTE: 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.
  2. Disconnect the electrical connector : B26 Crankshaft Position Sensor
  3. Test for less than 10 Ω between the test points : Low Reference circuit terminal 2/B & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector : K20 Engine Control Module
    2. Test for less than 2 Ω between the test points : Low Reference circuit terminal 2/B @ Component harness & The other end of the circuit @Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component : K20 Engine Control Module
    • Go to next step : If less than 10 Ω 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points : 5 V Reference circuit terminal 3/C & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : K20 Engine Control Module
    3. Test for infinite resistance between the test points : 5 V Reference circuit terminal 3/C @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points : 5 V Reference circuit terminal 3/C @ Component harness & The other end of the circuit @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component : K20 Engine Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points : 5 V Reference circuit terminal 3/C @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component : K20 Engine Control Module
    • Go to next step : If between 4.8 and 5.2 V 
  6. Rapidly tap a 3 A fused jumper wire between the test points : Signal circuit terminal 1/A & Ground

    Verify the scan tool parameter : Crankshaft Position Active Counter = Increments

    • If the parameter value does not increment 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points : Signal circuit terminal 1/A @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points : Signal circuit terminal 1/A @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    7. Test for less than 2 Ω between the test points : Signal circuit terminal 1/A @ Component harness & The other end of the circuit @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component : K20 Engine Control Module
    • Go to next step : If the parameter value increments 
  7. Verify DTC P0336 is not set.
    • If the DTC is set 

      Verify the following conditions do not exist :

    • B26 Crankshaft Position Sensor & Reluctor Ring - Excessive play/Foreign material passing between the components/Incorrect air gap /Incorrect installation/Loose/Visible Damage
    • Camshaft Sprocket - Visible Damage /Worn
    • Crankshaft Sprocket - Visible Damage /Worn
    • Engine Oil - Contaminated/Dirty
    • Timing Chain or Timing Belt - Visible Damage /Worn
    • Timing Chain Tensioner or Timing Belt Tensioner - Visible Damage /Worn
      • If a condition exists - Repair or replace as necessary
      • If no condition exists - Test or replace the component : B26 Crankshaft Position Sensor
    • Go to next step : If the DTC is not set 
  8. Test or replace the component : B26 Crankshaft Position Sensor
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