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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P3400, P3401, P3403, P3404, P3425, P3427, P3428, P3441, P3443, P3444, P3449, P3451 Or P3452: Cylinder Deactivation Solenoid Valve Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:Q43 Valve Lifter Oil Manifold Assembly
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points:Ignition circuit terminal 4 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 Ω between the test points:Ignition circuit terminal 4 & Output terminal @ F50UA Fuse
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Connect the electrical connector:Q43 Valve Lifter Oil Manifold Assembly
    3. Ignition - On / Vehicle - In Service Mode
    4. Replace the component: F50UA Fuse
    5. Verify the fuse does not open.
      • If the fuse opens and there are components connected to the circuit - Disconnect a component and repeat step 4.4
      • If the fuse opens with all components disconnected from the circuit - Repair the short to ground on the circuit.
      • If the fuse does not open after disconnecting a component from the circuit - Replace the component disconnected last.
      • If the fuse does not open with all components connected.
    6. Operate each component on the circuit, one at a time.It might be necessary to use scan tool control functions to operate the components.

      Verify the fuse does not open when any of the components are activated.

      • If the fuse opens - Replace the component that caused the fuse to open when activated.
      • If the fuse does not open.
    7. All OK.
    • Go to next step: If the test lamp turns On 
  5. Verify a test lamp does not turn On between the test points:
    • Control circuit terminal 1 & B+
    • Control circuit terminal 2 & B+
    • Control circuit terminal 3 & B+
    • Control circuit terminal 5 & B+
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X3 @ K20 Engine Control Module AS
    3. Test for infinite resistance between the test points:
      • Control circuit terminal 1 @ Component harness & Ground
      • Control circuit terminal 2 @ Component harness & Ground
      • Control circuit terminal 3 @ Component harness & Ground
      • Control circuit terminal 5 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K20 Engine Control Module
    • Go to next step: If the test lamp does not turn On 
  6. Remove - Test Lamp
  7. Perform the scan tool control function:Cylinder Deactivation - Cylinder 1, 4, 6, 7 - On

    Verify the scan tool parameter: Cylinder 1, 4, 6, 7 Deactivation Solenoid Valve Control Circuit High Voltage Test Status=OK

    • If not the specified state 
    1. Ignition/Vehicle - Off
    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
      • Control circuit terminal 3 @ Component harness & Ground
      • Control circuit terminal 5 @ 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 the specified state 
  8. Connect a 3 A fused jumper wire between the test points:
    • Control circuit terminal 1 & Ignition circuit terminal 4
    • Control circuit terminal 2 & Ignition circuit terminal 4
    • Control circuit terminal 3 & Ignition circuit terminal 4
    • Control circuit terminal 5 & Ignition circuit terminal 4
  9. Perform the scan tool control function:Cylinder Deactivation - Cylinder 1, 4, 6, 7 - On

    Verify the scan tool parameter: Cylinder 1, 4, 6, 7 Deactivation Solenoid Valve Control Circuit High Voltage Test Status =Malfunction

    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for less than 2 Ω between the test points:
      • Control circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness
      • Control circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness
      • Control circuit terminal 3 @ Component harness & The other end of the circuit @ Control module harness
      • Control circuit terminal 5 @ 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 specified state 
  10. Test or replace the component: Q43 Valve Lifter Oil Manifold Assembly
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