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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Mechanical - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC C11F0 or C11F1 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

The left engine mount/mount actuator or solenoid valve-left is also referred to as engine mount/mount actuator or solenoid valve number 1. The right engine mount/mount actuator or solenoid valve-right is also referred to as engine mount/mount actuator or solenoid valve number 2.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: Q80L Engine Mount Solenoid Valve - Left & Q80R Engine Mount Solenoid Valve - Right
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points: B+ circuit @ Component harness & 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 ohms between the test points: B+ circuit @ Component harness & Output terminal @ Q80 Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.

        Or

      • If less than 2 ohms - Refer to: Power Mode Mismatch
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for infinite resistance between the test points: B+ circuit @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the appropriate component: Q80L Engine Mount Solenoid Valve - Left or Q80R Engine Mount Solenoid Valve - Right
    • Go to next step: If the test lamp turns On 
  5. Connect a test lamp between the test points: Control circuit terminal 2 & B+
  6. Perform the scan tool control function: Engine Mount Actuator Output 1 & Engine Mount Actuator Output 2 - 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. Test for infinite resistance between the test points: Control circuit terminal 2 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control circuit terminal 2 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - 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 less than 1 V between the test points: Control circuit terminal 2 & 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 test lamp turns On and Off 
  7. Replace the appropriate component: Q80L Engine Mount Solenoid Valve - Left or Q80R Engine Mount Solenoid Valve - Right
  8. Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set.
    • If the DTC sets 

      Replace the component: K20 Engine Control Module

    • Go to next step: If the DTC is not set 
  9. All OK.
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