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Home >> Cadillac >> 2021 >> CT5 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls And Fuel - 3.0L (LGY) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0036-P0038, P0054, P0056-P0058, P0060, P0141, or P0161 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector: B52 Heated Oxygen Sensor
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points:
    • { Heated Oxygen Sensor 2 } Ignition circuit terminal 2 & Ground
    • { Heated Oxygen Sensor 2 Bank 2 } Ignition circuit terminal 2 & 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 2 & Output terminal @ 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
    2. Replace the component: Fuse
    3. Ignition - On / Vehicle - In Service Mode
    4. Verify the fuse does not open.
      • If the fuse opens and there are components connected to the circuit - Disconnect a component and repeat the test.
      • 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.
    • Go to next step: If the test lamp turns On 
  5. Verify a test lamp does not turn On between the test points:
    • { Heated Oxygen Sensor 2 } Control circuit terminal 1 & Ignition circuit terminal 2
    • { Heated Oxygen Sensor 2 Bank 2 } Control circuit terminal 1 & Ignition circuit terminal 2
    • Go to next step: If the test lamp turns 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:
      • { Heated Oxygen Sensor 2 } Control circuit terminal 1 @ Component harness & Ground
      • { Heated Oxygen Sensor 2 Bank 2 } Control circuit terminal 1 @ 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. Perform the scan tool control function: Heated Oxygen Sensor 2 Heater/Heated Oxygen Sensor 2 Heater Bank 2 - Increase/Decrease

    Verify a test lamp turns On between the test points:

    • { Heated Oxygen Sensor 2 } Control circuit terminal 1 & Ignition circuit terminal 2
    • { Heated Oxygen Sensor 2 Bank 2 } Control circuit terminal 1 & Ignition circuit terminal 2
    • If the test lamp does not turn On 
    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:
      • { Heated Oxygen Sensor 2 } Control circuit terminal 1 @ Component harness & Ground
      • { Heated Oxygen Sensor 2 Bank 2 } Control circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle & All vehicle systems - Off
    6. Test for less than 2 Ω between the test points:
      • { Heated Oxygen Sensor 2 } Control circuit terminal 1 @ Component harness & The other end of the circuit
      • { Heated Oxygen Sensor 2 Bank 2 } Control circuit terminal 1 @ Component harness & The other end of the circuit
      • 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 test lamp turns On 
  7. Test or replace the component: B52 Heated Oxygen Sensor
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