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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Automatic Transmission - VT40 (MRG) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2796-P2799 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: X175 @ T12 Automatic Transmission Assembly
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 1 (harness side) & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection: G104
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 1 (harness side) & Terminal G104
      • 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. Verify a test lamp turns On between the test points: B+ circuit terminal 3 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Test for less than 2 ohms between the test points: B+ circuit terminal 3 & Output terminal @ 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.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Test for infinite resistance between the test points: B+ circuit terminal 3 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K71 Transmission Control Module
    • Go to next step: If the test lamp turns On 
  5. Ignition - On / Vehicle - In Service Mode & Engine - Off
    6. NOTE:

    Testing for steps 6 to 7 is performed on the control module K71 side of the harness connector.

  6. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal 2 & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Test for infinite resistance between the test points: Signal 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: Signal 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: K71 Transmission Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Ignition - On / Vehicle - In Service Mode & Engine - Off
    4. Test for less than 1 V between the test points: Signal 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: K71 Transmission Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  7. Test for 1.4 to 2.4 V between the test points: Control circuit terminal 5 & Ground
    • If less than 1.4 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 5 & 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 5 & 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: K71 Transmission Control Module
    • If greater than 2.4 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Ignition - On / Vehicle - In Service Mode & Engine - Off
    4. Test for less than 1 V between the test points: Control circuit terminal 5 & 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 1.4 and 2.4 V 
  8. Remove the component: Torque Converter and Differential Housing
  9. Disconnect the electrical connector: G5 Transmission Fluid Pump - Electric/Auxiliary
  10. Test for less than 2 ohms between the test points:
    • B+ circuit terminal 2 @ G5 Transmission Fluid Pump - Electric/Auxiliary & Terminal 3 @ X175 (component side)
    • Control circuit terminal 1 @ G5 Transmission Fluid Pump - Electric/Auxiliary & Terminal 1 @ X175 (component side)
    • Ground circuit terminal 3 @ G5 Transmission Fluid Pump - Electric/Auxiliary & Terminal 1 @ X175 (component side)
    • Signal circuit terminal 4 @ G5 Transmission Fluid Pump - Electric/Auxiliary & Terminal 2 @ X175 (component side)
    • If 2 ohms or greater 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If less than 2 ohms 
  11. Test or replace the component: G5 Transmission Fluid Pump - Electric/Auxiliary
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