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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 197 (Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P176B-P176D: Intermediate Speed Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition Off and all vehicle systems Off. Disconnect the X175 harness connector at the T12 Automatic Transmission Assembly. It may take up to 2 min for all vehicle systems to power down, ignition On.
  2. Test for 8.3-9.8 V between the 9 V reference 1 circuit terminal 25 and ground.
    • If less than 8.3 V 
    1. Ignition Off, disconnect the harness connector at the K71 Transmission Control Module.
    2. Test for infinite resistance between the 9 V reference 1 circuit terminal 25 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 1 Ω in the 9 V reference 1 circuit end to end.
      • If 1 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 1 Ω, replace the K71 Transmission Control Module.
    • If greater than 9.8 V 
    1. Ignition Off.
    2. Disconnect the harness connector at the K71 Transmission Control Module, ignition On.
    3. Test for less than 1 V between the 9 V reference 1 circuit terminal 25 and ground.
      • If greater than the specified value, repair the short to voltage on the circuit.
      • If less than the specified value, replace the K71 Transmission Control Module.
    • If between 8.3-9.8 V 
  3. Ignition Off.
  4. Connect the red lead of the J-38522  generator, to the signal circuit terminal 32 and connect the black lead of the J-38522  generator to ground.
  5. Set the J-38522  generator to the specifications listed below:
    • Signal switch to 5 V
    • Frequency switch to 300 Hz
    • Duty cycle switch to the 50% or the Normal position
  6. Ignition ON.
  7. Verify the scan tool Intermediate Speed Sensor parameter is between 210-240 RPM.
    • If not between the specified range 
    1. Ignition Off, disconnect the harness connector at the K71 Transmission Control Module.
    2. Test for infinite resistance between the signal circuit terminal 32 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 1 Ω in the signal circuit end to end.
      • If 1 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 1 Ω, replace the K71 Transmission Control Module.
    • If between the specified range 
  8. Perform the Component Testing.
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