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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (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 Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. 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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