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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0713: Transmission Fluid Temperature Sensor Circuit - High Input >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Perform the transmission fluid checking procedure. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Was the fluid checking procedure performed? If so, go to next step. If not, see appropriate AUTOMATIC article in TRANSMISSION SERVICING.
  3. Install a scan tool. Turn ignition on, engine off. Before clearing the DTCs, use the scan tool to record the failure records. Using the CLEAR INFO function erases the failure records from the PCM. Record the failure records. Does the scan tool indicate that the TFT sensor signal voltage is greater than 4.92 volts? If so, go to next step. If not, see DIAGNOSTIC AIDS  .
  4. Does the scan tool indicate the TFT voltage is greater than 5.1 volts? If so, go to step  11 . If not, go to next step.
  5. Turn ignition off. Disconnect the transmission in-line 20-way connector. Install the Jumper Harness (J-44152) on the engine side of the transmission in-line 20-way connector. Using a DVOM and the Connector Test Adapter Kit (J-35616-A), measure the voltage between jumper harness terminal "L" and a good ground. Turn ignition on, engine off. Does the voltage measure 4.9-5.0 volts? If so, go to next step. If not, go to step  10 .
  6. Turn ignition off. Install a fused jumper wire between transmission in-line 20-way connector terminals "L" and "M". Turn ignition on, engine off. Does the scan tool indicate that the TFT sensor signal voltage parameter is less than 0.2 volt? If so, go to next step. If not, go to step  12 .
  7. Turn ignition off. Install the jumper harness to the transmission side of the transmission in-line 20-way connector. Measure the resistance between terminals "L" and "M". Does the resistance measure 16 k/ohms at 14°F (-10°C) to 133 ohms at 230°F (110°C)? If so, see DIAGNOSTIC AIDS  . If not, go to next step.
  8. Remove the transmission oil pan. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Test the TFT sensor signal circuit (1227) and the low reference circuit (452) for an open. Was an open condition found? If so, go to next step. If not, go to step  14 .
  9. Replace the transmission internal wiring harness assembly. See TRANSMISSION INTERNAL WIRING HARNESS  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  15 .
  10. Test the TFT sensor signal circuit (1227) for high resistance or an open. Did you find and correct the condition? If so, go to step  15 . If not, go to step  13 .
    11. NOTE: High voltage (battery voltage) in the signal circuit may cause an open in the TFT sensor.
  11. Test the TFT sensor signal circuit (1227) for a short to voltage battery voltage. Did you find and correct the condition? If so, go to step  15 . If not, go to step  13 .
  12. Test the TFT sensor low reference circuit (407) for an open. Did you find and correct the condition? If so, go to step  15 . If not, go to next step.
  13. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  15 .
  14. Replace the TFT sensor. See TFT SENSOR  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  15. Perform the following procedure to verify the repair:
    • Select DTC.
    • Select CLEAR INFO.
    • Operate the vehicle so TFT sensor indicates a voltage less than 4.92 volts for 400 seconds (6.8 minutes).
    • Select SPECIFIC DTCs.
    • Enter DTC P0713.

    Has the test run and passed? If so, system is okay. If not, go to step  1 .

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