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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 P10E1, P10E2, P10E3, P10E4: Ignition On/Start Circuit Source Bypass Relay 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. Remove the component:KR171 Engine Control Module Wake-Up Relay@X50A Fuse Block - Underhood
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points:
    • B+ circuit terminal 85 & Ground
    • B+ circuit terminal 87 & Ground
    • If the test lamp does not turn On 

      Replace the component:X50A Fuse Block - Underhood

    • Go to next step: If the test lamp turns On 
  5. Ignition/Vehicle - Off & Remove - Test lamp
  6. Connect a 3 A fused jumper wire between the test points:Ignition circuit terminal 30 & B+ circuit terminal 87
  7. Connect a test lamp between the test points:Control circuit terminal 86 & B+ circuit terminal 85
  8. Ignition - On / Vehicle - In Service Mode
  9. Clear the DTCs.
  10. Perform the scan tool control function:Ignition On/Start Switch Circuit - 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 appropriate electrical connector: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 86 @ Relay Socket & 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 less than 2 Ω between the test points:Control circuit terminal 86 @ Relay Socket & 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 the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the appropriate electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 86 @ Relay Socket & 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 turns On and Off 
  11. Test or replace the component:KR171 Engine Control Module Wake-Up Relay
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