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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 >> Component Testing

Component 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.
  1. Ignition/Vehicle - Off
  2. Remove - Transmission Cover
  3. Disconnect the electrical connector: X175 @ T12 Automatic Transmission Assembly
  4. Disconnect - B15 Transmission Internal Mode Switch
  5. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:

    9V Reference Circuit 1Terminal 10 &

    • Signal B - Terminal 8
    • Signal P - Terminal 9
    • Signal S - Terminal 7
  6. Test for infinite resistance between the test points:

    9V Reference Circuit 1Terminal 10 &

    • Signal B - Terminal 8
    • Signal P - Terminal 9
    • Signal S - Terminal 7
    • If less than infinite resistance 
    1. Remove - Jumper Wire
    2. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:
    3. 9V Reference Circuit 2Terminal 4 &
      • Signal B - Terminal 8
      • Signal P - Terminal 9
      • Signal S - Terminal 7
    4. Test for infinite resistance between the test points: Terminal 31 @ X175 & Ground
      • If less than infinite resistance 

        Replace the component: Automatic Transmission Control Wiring Harness

      • If infinite resistance 

        Replace the component: Automatic Transmission Control Wiring Harness

    • Go to next step: If infinite resistance 
  7. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:

    9V Reference Circuit 1Terminal 10 &

    • Signal B - Terminal 8
    • Signal P - Terminal 9
    • Signal S - Terminal 7
  8. Test for less than 2 ohms between the test points:

    9V Reference Circuit 1Terminal 10 &

    • Signal B - Terminal 8
    • Signal P - Terminal 9
    • Signal S - Terminal 7
    • If greater than 2 ohms 
    1. Remove - Jumper Wire
    2. Disconnect the electrical connector: X176
    3. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:

      9V Reference Circuit 1Terminal 19 @ X176 &

      • Signal B - Terminal 3
      • Signal P - Terminal 17
      • Signal S - Terminal 6
    4. Test for less than 2 ohms between the test points:

      9V Reference Circuit 1Terminal 10 &

      • Signal B - Terminal 28
      • Signal P - Terminal 23
      • Signal S - Terminal 34
      • If less than infinite resistance 

        Replace the component: Automatic Transmission Control Wiring Harness

      • If infinite resistance 

        Replace the component: Automatic Transmission Control Wiring Harness

    • Go to next step: If less than 2 ohms 
  9. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:

    9V Reference Circuit 2Terminal 4 @ B15 Transmission Internal Mode Switch &

  10. Connect a jumper wire between the 9 V Reference 2 circuit terminal 4 and each signal circuit listed below one at a time:
    • Signal A - Terminal 5
    • Signal C - Terminal 6
  11. Test for infinite resistance between the test points: 9V Reference Circuit 2Terminal 29 @ X175 & Ground
    • If less than infinite resistance 
    1. Remove - Jumper Wire
    2. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:

      9V Reference Circuit 2Terminal 5 @ X176 &

      • Signal A - Terminal 2
      • Signal C - Terminal 11
    3. Test for infinite resistance between the test points: X175Terminal 29 & Ground
      • If less than infinite resistance 

        Replace the component: Automatic Transmission Control Wiring Harness

      • If infinite resistance 

        Replace the component: Automatic Transmission Control Wiring Harness

    • Go to next step: If infinite resistance 
  12. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:

    9V Reference Circuit 2Terminal 5 @ X176 &

    • Signal A - Terminal 2
    • Signal C - Terminal 11
  13. Test for less than 2 ohms between the test points:

    9V Reference Circuit 2Terminal 29 @ X175 &

    • Signal A - Terminal 22
    • Signal C - Terminal 21
    • If greater than 2 ohms 
    1. Remove - Jumper Wire
    2. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:

      9V Reference Circuit 2Terminal 5 @ X176 &

      • Signal A - Terminal 2
      • Signal C - Terminal 11
    3. Test for less than 2 ohms between the test points:

      9V Reference Circuit 2Terminal 29 @ X175 &

      • Signal A - Terminal 22
      • Signal C - Terminal 21
      • If greater than 2 ohms 

        Replace the component: Automatic Transmission Control Wiring Harness

      • If less than 2 ohms 

        Replace the component: Automatic Transmission Control Wiring Harness

    • Go to next step: If less than 2 ohms 
  14. Connect a 3 A fused jumper wire between the test points: Ignition circuit terminal 1 & Ground circuit terminal 2 @ B15 Transmission Internal Mode Switch
  15. Test for infinite resistance between the test points: Ignition circuit terminal 12Ignition terminal X176 & Ground
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Control Wiring Harness

    • Go to next step: If infinite resistance 
    1. Test for less than 2 ohms between the test points: Ignition circuit terminal 12 & Ground circuit terminal 20 @ X176
    2. If 2 Ω or greater, replace the transmission control wiring harness.
    • If 2 ohms or greater - Replace the component:

      Automatic Transmission Control Wiring Harness

    • Go to next step: If 2 ohms or less

      Go to next step: All OK.

    • Go to next step: If infinite resistance 
  16. Remove - Jumper Wire
  17. Connect a 3 A fused jumper wire between the test points: Ignition circuit terminal 12 & Ground circuit terminal 20 @ X176
  18. Test for infinite resistance between the test points: Ignition circuit terminal 35 @ X176 & Ground
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Control Wiring Harness

    • Go to next step: If infinite resistance
    1. Test for less than 2 ohms between the test points: Ignition circuit terminal 35 & Ground circuit terminal 30 & X175
    2. If 2 Ω or greater, replace the automatic transmission wiring harness, electrical connector passage sleeve.
    • If 2 ohms or greater

      Replace the component: Automatic Transmission Control Wiring Harness

    • Go to next step: If 2 ohms or less

      Go to next step: All OK.

    • Go to next step: If infinite resistance 
  19. Replace the component: B15 Transmission Internal Mode Switch
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