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Home >> Cadillac >> 2021 >> XT5 Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 633 (Automatic Transmission - 9T60 (M3G) Or 9T65 (M3W) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P27EF, P27F1, or P27F2 >> Circuit / System Testing

Circuit / System Testing

WARNING: This page is about a different car, the 2021 Cadillac XT6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  2. Ignition / Vehicle - Off
  3. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  4. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  5. Ignition - On / Vehicle - In Service Mode
  6. Test for 8. 8 to 9. 2 V between the test points: 9 V Reference circuit terminal 7 & Ground
    • If less than 8. 8 V 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition / Vehicle - Off
    3. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    4. Disconnect the electrical connector: K71 Transmission Control Module
    5. Test for infinite resistance between the test points: 9 V Reference circuit terminal 7 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    6. Test for less than 2 ohms between the test points: 9 V Reference circuit terminal 7 @ Component harness & Terminal 8 @ Control module harness
      • If 2 ohms or greater - Repair the open / high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K71 Transmission Control Module
    • If greater than 9. 2 V 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition / Vehicle - Off
    3. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    4. Disconnect the electrical connector: K71 Transmission Control Module
    5. Ignition - On / Vehicle - In Service Mode
    6. Test for less than 1 V between the test points: 9 V Reference circuit terminal 7 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K71 Transmission Control Module
    • Go to next step: If between 8. 8 and 9. 2 V 
  7. Install the special tool: EL-38522 Variable Signal Generator
    • Set the voltage to 5 V
    • Set the frequency to 10k Hz
    • Set the duty cycle to 40%%
    • Red lead @ Signal circuit terminal 20 X1 @ T12 Automatic Transmission Assembly
    • Black lead @ Ground
  8. Verify the scan tool parameter: Transmission Range Control Valve 2 Position Switch = 2. 0 to 2. 3 V
    • If less than 2. 0 V 
    1. Remove - Jumper Wire (s)
    2. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    3. Ignition / Vehicle - Off
    4. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    5. Disconnect the electrical connector: K71 Transmission Control Module
    6. Test for infinite resistance between the test points: Signal circuit terminal 60 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points: Signal circuit terminal 20 X1 @ Component harness & Terminal 60 @ Control module harness
      • If 2 ohms or greater - Repair the open / high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K71 Transmission Control Module
    • If greater than 2. 3 V 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition / Vehicle - Off
    3. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    4. Disconnect the electrical connector: K71 Transmission Control Module
    5. Ignition - On / Vehicle - In Service Mode
    6. Test for less than 1 V between the test points: Signal circuit terminal 20 X1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K71 Transmission Control Module
    • Go to next step: If between 2. 0 and 2. 3 V 
  9. Remove the transmission cover.
  10. Connect the electrical connector: X1 @ T12 Automatic Transmission AssemblyX1
  11. Disconnect the component: B315B Transmission Range Control Valve 2 Position Switch
  12. Test for 8. 8 to 9. 2 V between the test points: 9 V Reference circuit terminal 2 & Ground
    • If less than 8. 8 V 
    1. Ignition / Vehicle - Off
    2. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    3. Test for infinite resistance between the test points: 9 V Reference circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Replace the component: Automatic Transmission Wiring Harness
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: 9 V Reference circuit terminal 2 @ Component harness & Terminal 1 X2 @ Component harness
      • If greater than 2 ohms - Replace the component: Automatic Transmission Wiring Harness
      • If less than 2 ohms - Replace the component: B315B Transmission Range Control Valve 2 Position Switch
    • If greater than 9. 2 V 
    1. Ignition / Vehicle - Off
    2. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: 9 V Reference circuit terminal 2 @ Component harness & Ground
      • If greater than 1 V - Replace the component: Automatic Transmission Wiring Harness
      • If less than 1 V - Replace the component: K71 Transmission Control Module
    • Go to next step: If between 8. 8 and 9. 2 V 
  13. Install the special tool: EL-38522 Variable Signal Generator Is it clear that the K71 Connector should be connected at this point in the diag?
    • Set the voltage to 5 V
    • Set the frequency to 10k Hz
    • Set the duty cycle to 40%
    • Red lead @ Signal circuit terminal 1 @ Component harness
    • Black lead @ Ground
  14. Verify the scan tool parameter: Transmission Range Control Valve 2 Position Switch = 2. 0 to 2. 3 V
    • If less than 2. 0 V 
    1. Ignition / Vehicle - Off & Remove - Jumper wire (s)
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Replace the component: Automatic Transmission Wiring Harness
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Signal circuit terminal 1 @ Component harness & Terminal 9 X2 @ Component harness
      • If greater than 2 ohms - Replace the component: Automatic Transmission Wiring Harness
      • If less than 2 ohms - Replace the component: B315B Transmission Range Control Valve 2 Position Switch
    • If greater than 2. 3 V 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition / Vehicle - Off
    3. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    4. Disconnect the electrical connector: K71 Transmission Control Module
    5. Ignition - On / Vehicle - In Service Mode
    6. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component harness & Ground
      • If greater than 1 V - Replace the component: Automatic Transmission Wiring Harness
      • If less than 1 V - Replace the component: B315B Transmission Range Control Valve 2 Position Switch
    • Go to next step: If between 2. 0 and 2. 3 V 
  15. Test or replace the component: B315B Transmission Range Control Valve 2 Position Switch
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