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Home >> Chevrolet >> 2020 >> Camaro SS, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Automatic Transmission - 8L45 (M5T) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0722, P0723, P077C, or P077D >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    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: X175@T12 Automatic Transmission Assembly
  3. Ignition - On / Vehicle - In Service Mode
  4. Test for 8. 5 to 9. 5 V between the test points: 9 V Reference circuit 1 Terminal 25@Component harness & Ground
    • If less than 8. 5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X175@K71 Transmission Control Module
    3. Test for infinite resistance between the test points: 9 V Reference circuit 1 Terminal 25@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: 9 V Reference circuit 1 Terminal 25@Component harness & Terminal 7@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. 5 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: 9 V Reference circuit 1 Terminal 25@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. 5 and 9. 5 V 
  5. Ignition/Vehicle - Off
  6. Install the special tool: EL-38522 Variable Signal Generator
    • Red lead@Signal circuit terminal 24
    • Black lead@Ground
    • Set the voltage to 5 V
    • Set the frequency to 300 Hz
    • Set the duty cycle to 50%
  7. Ignition - On / Vehicle - In Service Mode
  8. Verify the scan tool parameter: Transmission OSS = 230 to 280 RPM
    • If not between 230 and 280 RPM 
    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: Signal circuit terminal 24@Component harness & Ground
      • 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 infinite resistance between the test points: Signal circuit terminal 24@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 24@Component harness & Terminal 14@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 between 230 and 280 RPM 
  9. Ignition/Vehicle - Off
  10. Connect the electrical connector: X175@T12 Automatic Transmission Assembly
  11. Remove the component: Automatic Transmission Fluid Pan
  12. Disconnect the electrical connector: X177
  13. Ignition - On / Vehicle - In Service Mode
  14. Test for 8. 5 to 9. 5 V between the test points: 9 V Reference circuit 1 Component terminal 2 & Ground
    • If not between 8. 5 and 9. 5 V 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If between 8. 5 and 9. 5 V 
  15. Ignition Off
  16. Install the special tool: EL-38522 Variable Signal Generator
    • Red lead@Signal circuit terminal 1
    • Black lead@Ground
    • Set the voltage to 5 V
    • Set the frequency to 300 Hz
    • Set the duty cycle to 50%
  17. Ignition - On / Vehicle - In Service Mode
  18. Verify the scan tool parameter: Transmission OSS = 230 to 280 RPM
    • If not between 230 and 280 RPM 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If between 230 and 280 RPM 
  19. Remove the component: B14A Transmission Output Shaft Speed Sensor
  20. Inspect the following components: Output Carrier Assembly - Damaged or misaligned reluctor ring.
    • If a condition exists 

      Replace the component: Output Carrier Assembly

    • Go to next step: If no condition exists 
  21. Replace the component: B14A Transmission Output Shaft Speed Sensor
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