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Home >> Chevrolet >> 2023 >> Camaro ZL1, 2D Convertible, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Automatic Transmission - 10L60, 10L80 Or 10L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0707, P0708, P2802, P2803, or P2805 >> 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. NOTE:

    To turn the ignition off on vehicles equipped with a push button ignition switch, the wiring harness connector must be connected to the component T12.A valid park input signal to the control module K71 is required to turn the ignition 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 20 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K20 Engine Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 20@Component harness & 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: K20 Engine 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 12 & Low Reference circuit terminal 20
    • If less than 4.8 V 
    1. Connect the electrical connector: X1@T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the appropriate electrical connector: K20 Engine Control Module
    4. Disconnect the electrical connector: X1@ T12 Automatic Transmission Assembly
    5. Test for infinite resistance between the test points: 5 V Reference circuit terminal 12@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: 5 V Reference circuit terminal 12@Component harness & 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: K20 Engine Control Module
    • If greater than 5.2 V 
    1. Connect the electrical connector: X1@T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the appropriate electrical connector: K20 Engine Control Module
    4. Disconnect the electrical connector: X1@T12 Automatic Transmission Assembly
    5. Ignition - On/Vehicle - In Service Mode
    6. Test for less than 1 V between the test points: 5 V Reference circuit terminal 12@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K20 Engine Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  6. Verify the scan tool parameter:
    • Transmission Range Sensor 1@K71 Transmission Control Module@Transmission Data = 100%
    • Transmission Range Sensor 2@K20 Engine Control Module@Automatic Transmission Data = 100%
    • If not the specified values 
    1. Connect the electrical connector: X1@T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the appropriate electrical connector: K20 Engine Control Module
    4. Disconnect the electrical connector: K71 Transmission Control Module
    5. Disconnect the electrical connector: X1@T12 Automatic Transmission Assembly
    6. Test for infinite resistance between the test points:
      • {P0707, P0708} Signal circuit terminal 5@Component harness & Ground
      • {P2802, P2803} Signal circuit terminal 6 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • {P0707, P0708} If infinite resistance - Replace the component: K71 Transmission Control Module
      • {P2802, P2803} If infinite resistance - Replace the component: K20 Engine Control Module
    • Go to next step: If the specified values 
  7. Connect a 3 A fused jumper wire between the test points:
    • Signal circuit terminal 5 & Low Reference circuit terminal 20
    • Signal circuit terminal 6 & Low Reference circuit terminal 20
  8. Verify the scan tool parameter:
    • Transmission Range Sensor 1@K71 Transmission Control Module@Transmission Data = 0%
    • Transmission Range Sensor 2@K20 Engine Control Module@Automatic Transmission Data = 0%
    • If not the specified values 
    1. Remove - Jumper Wire(s)
    2. Connect the electrical connector: X1@T12 Automatic Transmission Assembly
    3. Ignition/Vehicle - Off
    4. Disconnect the appropriate electrical connector: K20 Engine Control Module
    5. Disconnect the electrical connector: X1@T12 Automatic Transmission Assembly
    6. Ignition - On/Vehicle - In Service Mode
    7. Test for less than 1 V between the test points: Ground &
      • {P0707, P0708} Signal circuit terminal 5 & Ground
      • {P2802, P2803} Signal circuit terminal 6 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    8. Ignition/Vehicle - Off
    9. Test for less than 2 ohms between the test points:
      • {P0707, P0708} Signal circuit terminal 5 & The other end of the circuit
      • {P2802, P2803} Signal circuit terminal 6 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • {P0707, P0708} If less than 2 ohms - Replace the component: K71 Transmission Control Module
      • {P2802, P2803} If less than 2 ohms - Replace the component: K20 Engine Control Module
    • Go to next step: If the specified values 
  9. Remove the component: Automatic Transmission Fluid Pan
  10. Disconnect the component: B303 Transmission Range Sensor
  11. Connect the electrical connector: X1@T12 Automatic Transmission Assembly
  12. Test for less than 10 ohms between the test points: Low Reference circuit terminal 1@Component harness & Ground
    • If greater than 10 ohms 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If less than 10 ohms 
  13. Test for the voltage listed below between the test points:
    • Signal circuit terminal 2@Component harness & Ground = 4.8 to 5.2 V
    • Signal circuit terminal 3@Component harness & Ground = Greater than 10 V
    • 5 V Reference circuit terminal 4@Component harness = 4.8 to 5.2 V
    • If not in the specified range 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If in the specified range 
  14. Test or replace the component: B303 Transmission Range Sensor
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