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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1047 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2771) >> DTC P0712 or P0713 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the AT 20-way inline connector. Using a DMM and the J 35616  GM-approved terminal test kit, measure the voltage at the TFT sensor signal circuit at the engine side of the connector. The voltage should be 4.9-5.1 volts.
      IMPORTANT: If a short to voltage is found, test the TFT sensor for damage.
    • If the voltage is less than the specified range, test the TFT sensor signal circuit for an open, high resistance, or short to ground.
    • If the voltage is above the specified range, test the TFT sensor signal circuit for a short to voltage.
  2. Using the J 35616  , measure the voltage between the TFT sensor signal circuit and the low reference circuit at the engine side of the AT 20-way inline connector. The voltage should be 4.9-5.1 volts.
    • If the voltage is less than the specified value, test the low reference circuit for an open, high resistance, or short to ground.
  3. Install the J 44152  jumper harness (20 Pins) on the transmission side of the AT 20-way inline connector. See Special Tools . Using the J 35616  , measure the resistance between the TFT sensor signal circuit and the low reference circuit. Refer to Temperature Versus Resistance .
    • If the resistance is greater than the specified range for a given temperature, test the TFT sensor signal circuit and the low reference circuit for an open or high resistance.
    • If the resistance is less than the specified range, test the TFT sensor signal circuit and the low reference for a shorted together condition or a faulty TFT sensor.
    • If a shorted together condition is found, replace the transmission wiring harness.
  4. Using the J 35616  , measure the resistance between the TFT sensor signal circuit and the transmission case. The resistance should be greater than 10K ohms.
    • If the resistance is less than 10K ohms, test the TFT sensor signal circuit for a short to the transmission case.
    • If a short to the case is found, replace the transmission wiring harness.
  5. Using the J 35616  , measure the resistance between the low reference circuit and the transmission case. The resistance should be greater than 10K ohms.
    • If the resistance is less than 10K ohms, test the low reference circuit for a short to the transmission case.
    • If a short to the case is found, replace the transmission wiring harness.
  6. Using the J 35616  , measure the resistance between the TFT sensor signal circuit and all other circuits of the J 44152  except the low reference circuit. See Special Tools . The resistance should be greater than 10K ohms.
    • If the resistance is less than 10K ohms, replace the transmission wiring harness.
    • If all circuits/connections test normal, test the TFT sensor.
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