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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P205B - P2BAA) And Symptoms) >> Diagnostic Information And Procedures >> DTC P20F8: Intake Manifold Runner Control Valve Control Circuit Performance >> 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 electrical connector: M98 Intake Manifold Runner Valve Actuator
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify a test lamp does not turn On between the test points: Control circuit terminal 1 & B+
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X2 @ K20 Engine Control Module
    3. Test for infinite resistance between the test points: 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 
  5. Remove - Test Lamp
  6. Verify the scan tool parameter: Intake Manifold Runner Control Valve Control Circuit High Voltage Test Status = OK
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X2 @ 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
      • 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 
  7. Connect a 3 A fused jumper wire between the test points: Control circuit terminal 1 & Ignition circuit terminal 6
  8. Perform the scan tool control function: Intake Manifold Runner Control Valve - Increase

    Verify the scan tool parameter: Intake Manifold Runner Control 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: X2 @ K20 Engine Control Module
    3. Test for less than 2 between the test points: Control circuit terminal 1 @ Component harness & Terminal 54 @ Control module harness
      • If 2 or greater - Repair the open/high resistance in the circuit.
      • If less than 2 - Replace the component: K20 Engine Control Module
    • Go to next step: If the specified state 
  9. Test or replace the component: M98 Intake Manifold Runner Valve Actuator
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