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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P182E or P1915 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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 = Off
  2. Disconnect the electrical connector: X175 @ T12 Automatic Transmission Assembly
  3. Test for less than 5 ohms between the test points: Ground circuit terminal 30 & Ground
    • If 5 ohms or greater 
    1. Disconnect the appropriate electrical connector: K71 Transmission Control Module
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 30 & 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
    • Go to next step: If less than 5 ohms 
  4. Ignition = On
  5. Test for 8. 3 to 9. 3 V between the test points: 9V Reference Circuit 1Terminal 31 & Ground
    • If 9. 3 V or greater
    1. Ignition = Off
    2. Disconnect the appropriate electrical connector: K71 Transmission Control Module
    3. Ignition = On
    4. Test for less than 1 V between the test points: 9V Reference Circuit 2Terminal 29 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V, replace the K71 Transmission Control Module.
      • Go to next step: If less than 1 V
    • If less than 8. 3 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K71 Transmission Control Module
    3. Test for infinite resistance between the test points: 9V Reference Circuit 1Terminal 31 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Ignition/Vehicle - Off
    5. Disconnect the appropriate electrical connector: K71 Transmission Control Module
    6. Test for infinite resistance between the test points: 9V Reference Circuit 2Terminal 29 & 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: 9V Reference Circuit 1Terminal 31 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K71 Transmission Control Module.
      • Go to next step: If less than 2 ohms
    8. Test for less than 2 ohms between the test points: 9V Reference Circuit 2Terminal 29 & 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
    • Go to next step: If between 8. 3 and 9. 3 V 
  6. Verify the scan tool parameter: Internal Mode Switch = High
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K71 Transmission Control Module
    3. Test for infinite resistance between the test points: 9V Reference Circuit 1Terminal 31 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for infinite resistance between the test points: 9V Reference Circuit 2Terminal 29 & 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 specified state 
  7. Connect a 3 A fused jumper wire between the test points: 9V Reference Circuit 1Terminal 31 & Ground
  8. Verify the scan tool parameter: 9V Reference Circuit 1 = Low
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Remove - Jumper Wire
    3. Disconnect the appropriate electrical connector: K71 Transmission Control Module
    4. Test for less than 1 V between the test points: 9V Reference Circuit 1Terminal 31 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Test for less than 2 ohms between the test points: 9V Reference Circuit 1Terminal 31 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 ohms
  9. Connect a 3 A fused jumper wire between the test points: 9V Reference Circuit 2Terminal 29 & Ground
  10. Verify the scan tool parameter: 9V Reference Circuit 2 = Low
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Remove - Jumper Wire
    3. Disconnect the appropriate electrical connector: K71 Transmission Control Module
    4. Test for less than 1 V between the test points: 9V Reference Circuit 2Terminal 29 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Test for less than 2 ohms between the test points: 9V Reference Circuit 2Terminal 29 & 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
    • Go to next step: If the specified state 
  11. Test for 11 to 13 V between the test points: Signal circuit terminal 35 @ X175Ground
    • If not between 11 and 13 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K71 Transmission Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 35 @ X175 & 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 35 @ X175 & Ground
      • 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 11 and 13 V 
  12. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 35 & Ground circuit terminal 30 @ X175
  13. Verify the scan tool parameter: Park/Neutral Position Switch = Park/Neutral
    • If not the specified state 

      Replace the component: K71 Transmission Control Module

    • Go to next step: If the specified state 
  14. Refer to: Component Testing
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