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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Manual Transmission - TREMEC 6-Speed (M3L Mg9)) >> Diagnostic Information and Procedures >> DTC P0712 or P0713: Transmission Fluid Temperature 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 harness connector of the B13 Transmission Fluid Temperature Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal A and ground.
    • If 10 Ω or greater 
    1. Disconnect the appropriate harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Transmission Fluid Temperature Sensor parameter is at -40°C (-40°F).
    • If greater than -40°C (-40°F) 
    1. Ignition OFF, disconnect the appropriate harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit terminal B and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If at -40°C (-40°F) 
    5. NOTE:

    If the signal circuit of the B13 Transmission Fluid Temperature Sensor is shorted to voltage the sensor may be damaged.

  5. Install a 3-amp fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A.
  6. Verify the scan tool Transmission Fluid Temperature Sensor parameter is greater than 169°C (337°F).
    • If 169°C (337°F) or less 
    1. Ignition OFF, remove the jumper wire, disconnect the appropriate harness connector at the K20 Engine Control Module.
    2. Test for less than 1 V between the signal circuit terminal B and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 169°C (337°F) 
  7. Replace the B13 Transmission Fluid Temperature Sensor.
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