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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Automatic Transmission - VT40 (MRG) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0841-P0843 or P0846-P0848 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. 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: X1 @ T12 Automatic Transmission Assembly
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 27 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K71 Transmission Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 27 @ 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:K71 Transmission Control Module
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 13 & Low Reference circuit terminal 27
    • 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: 5 V Reference circuit terminal 13 @ 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: 5 V Reference circuit terminal 13 @ 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: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
    4. Test for less than 1 V between the test points:C @ 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 4.8 and 5.2 V 
  6. Verify the scan tool parameter:
    • { P0841 - P0843 } Transmission Fluid Pressure Sensor 1 = 4.8 to 5.2 V
    • { P0846 - P0848 } Transmission Fluid Pressure Sensor 2 = 4.8 to 5.2 V
    • 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:5 V Reference circuit terminal 13 & 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:5 V Reference circuit terminal 13 & 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: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
    4. Test for less than 1 V between the test points:Ground &
      • { P0841 - P0843 } Signal circuit terminal 11 @ Component harness
      • { P0846 - P0848 } Signal circuit terminal 9 @ Component harness
      • 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. Connect a 3 A fused jumper wire between the test points:Ground &
    • { P0841 - P0843 } Signal circuit terminal 11
    • { P0846 - P0848 } Signal circuit terminal 9
  8. Verify the scan tool parameter:
    • { P0841 - P0843 } Transmission Fluid Pressure Sensor 1 = 0.0 V
    • { P0846 - P0848 } Transmission Fluid Pressure Sensor 2 = 0.0 V
    • If greater than 0.0 V 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:K71 Transmission Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Ground &
      • { P0841 - P0843 } Signal circuit terminal 11
      • { P0846 - P0848 } Signal circuit terminal 9
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points:
      • { P0841 - P0843 } Signal circuit terminal 11 & The other end of the circuit @ Control module harness
      • { P0846 - P0848 } Signal circuit terminal 9 & 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:K71 Transmission Control Module
    • Go to next step: If 0.0 V 
  9. Remove the component:Control Valve Body Cover
  10. Connect the electrical connector:X1 @ T12 Automatic Transmission Assembly
  11. Disconnect the electrical connector:
    • { P0841 - P0843 } B12BA Transmission Fluid Pressure Sensor 1
    • { P0846 - P0848 } B12BB Transmission Fluid Pressure Sensor 2
  12. Test for 4.8 to 5.2 V between the test points:5 V Reference circuit terminal 1 & Low Reference circuit terminal 2
    • If less than 4.8 V 

      Replace the component:Automatic Transmission Wiring Harness

    • Go to next step: If between 4.8 and 5.2 V 
  13. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 3 & Low Reference circuit terminal 2
  14. Verify the scan tool parameter:
    • { P0841 - P0843 } Transmission Fluid Pressure Sensor 1 = 5.0 V
    • { P0846 - P0848 } Transmission Fluid Pressure Sensor 2 = 5.0 V
    • If less than 5.0 V 

      Replace the component:Automatic Transmission Wiring Harness

    • Go to next step: If 5.0 V 
  15. Test or replace the component:B12B Transmission Fluid Pressure Sensor
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