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Home >> GMC >> 2020 >> Acadia AT4 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 9T50 (M3H), 9T60 (M3G) Or 9T65 (M3W M3V) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P17F5-P17F7, P17FA-P17FC, or P17FF >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector :
    • B14E Transmission Input/Intermediate Shaft Speed Sensor
    • X1@T12 Automatic Transmission Assembly
  3. Ignition - On / Vehicle - In Service Mode
  4. Test for 8.6 to 9.2 V between the test points : 9 V Reference circuit terminal 1 X1@T12 Automatic Transmission Assembly (harness side) & Ground
    • If less than 8.6 V 
    1. Disconnect the electrical connector : K71 Transmission Control Module
    2. Test for infinite resistance between the test points : 9 V Reference circuit terminal 1 X1@T12 Automatic Transmission Assembly (harness side) & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step : If infinite resistance
    3. Test for less than 2 ohms between the test points : 9 V Reference circuit terminal 1 X1@T12 Automatic Transmission Assembly (harness side) & 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 9.2 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 : 9 V Reference circuit terminal 1 X1@T12 Automatic Transmission Assembly (harness side) & 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 8.6 and 9.2 V 
  5. Verify the scan tool parameter :
    • { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor 1 = Less than 0.4 V
    • { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = Less than 0.4 V
    • If 0.4 V or greater 
    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 0.4 V between the test points :
      • { P17F5, P17F6, P17F7 } Signal circuit terminal 17@T12 Automatic Transmission Assembly (harness side) & Ground
      • { P17FA, P17FB, P17FC } Signal circuit terminal 16@T12 Automatic Transmission Assembly (harness side) & Ground
      • If 0.4 V or greater - Repair the short to voltage on the circuit.
      • If less than 0.4 V - Replace the component : K71 Transmission Control Module
    • Go to next step : If less than 0.4 V 
  6. Connect a 3 A fused jumper wire between the test points :
    • { P17F5, P17F6, P17F7 } Signal circuit terminal 17 X1 & 9 V Reference circuit terminal 1 X1
    • { P17FA, P17FB, P17FC } Signal circuit terminal 16 X1 & 9 V Reference circuit terminal 1 X1
  7. Verify the scan tool parameter :
    • { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor 1 = Greater than 4.8 V
    • { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = Greater than 4.8 V
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector : K71 Transmission Control Module
    3. Test for infinite resistance between the test points :
      • { P17F5, P17F6, P17F7 } Signal circuit terminal 17 X1@Component harness & Ground
      • { P17FA, P17FB, P17FC } Signal circuit terminal 16 X1@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 :
      • { P17F5, P17F6, P17F7 } Signal circuit terminal 17 X1@Component harness & Terminal 59@Control module harness
      • { P17FA, P17FB, P17FC } Signal circuit terminal 16 X1@Component harness & Terminal 61@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 greater than 4.8 V 
  8. Ignition/Vehicle - Off & Remove - Jumper wire(s)
  9. Remove the component : Control Valve Body Cover
  10. Connect the electrical connector : X1@T12 Automatic Transmission Assembly
  11. Disconnect the electrical connector : B316 Transmission Park Valve Position Switch
  12. Ignition - On / Vehicle - In Service Mode
  13. Verify the scan tool parameter :
    • { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor 1 = Less than 0.4 V
    • { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = Less than 0.4 V
    • If 0.4 V or greater 

      Replace the component : Automatic Transmission Wiring Harness

  14. Test for 8.6 to 9.2 V between the test points : 9 V Reference circuit terminal 1 & Ground
    • If not between 8.6 and 9.2 V 

      Replace the component : Automatic Transmission Wiring Harness

    • Go to next step : If between 8.6 and 9.2 V 
  15. Connect a 3 A fused jumper wire between the test points :
    • { P17F5, P17F6, P17F7 } Signal circuit terminal 2@B316 Transmission Park Valve Position Switch (harness side) & Terminal 1
    • { P17FA, P17FB, P17FC } Signal circuit terminal 3@Component harness & Terminal 1
  16. Verify the scan tool parameter :
    • { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor 1 = Greater than 4.8 V
    • { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = Greater than 4.8 V
    • If less than 4.8 V 

      Replace the component : Automatic Transmission Wiring Harness

    • Go to next step : If 4.8 V or greater 
  17. Test or replace the component : B316 Transmission Park Valve Position Switch
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