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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Manual Transmission - TREMEC 6-Speed (Mg9) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Rev Match Switch Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: S86 Vehicle Stability Control System Switch
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 6 & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection: Ground terminal
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 6 @ Component harness & Ground terminal
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for 7.0 to 8.4 V between the test points: Signal circuit terminal 3 & Ground
    • If less than 7.0 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K9 Body Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 3 @ Component harness & 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: Signal circuit terminal 3 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
    • If greater than 8.4 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K9 Body Control Module
    • Go to next step: If between 7.0 and 8.4 V 
  6. Test or replace the component: S86 Vehicle Stability Control System Switch
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