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Home >> GMC >> 1998 >> Yukon 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0713: Trans. Fluid Temperature (TFT) Sensor Circuit High Input >> Diagnostic Procedure

Diagnostic Procedure

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  1. Ensure transmission fluid level is correct. Connect scan tool to DLC. Turn ignition switch to ON position. DO NOT start engine. Using scan tool, record freeze frame and failure records for reference. Data will be lost when DTCs are cleared later in this test.
  2. Read TFT sensor signal voltage on scan tool. If TFT sensor signal voltage is more than 4.92 volts, go to next step. If TFT sensor signal voltage is less than 4.92 volts, see DIAGNOSTIC AIDS.
  3. If TFT sensor signal voltage is more than 5.1 volts, check for short to voltage in TFT sensor signal circuit. Repair as necessary, then go to step 8). If circuit is okay, go to step 7). If TFT sensor signal voltage is less than 5.1 volts, go to next step.
  4. Turn ignition off. Disconnect transmission 20-pin connector. Install Jumper Harness (J-39775) on VCM side of transmission 20-pin connector. Turn ignition on. Using a DVOM, measure voltage between ground and terminal "L" of transmission 20-pin connector. See Figure. If voltage is 4.9-5.0 volts, go to next step. If voltage is not 4.9-5.0 volts, check for open or high resistance in TFT sensor signal circuit. Repair as necessary, then go to step 8). If circuit is okay, go to step 7).
  5. Turn ignition off. Install fused jumper wire between terminals "L" and "M" of transmission 20-pin connector. See Figure. Turn ignition on. Read TFT sensor signal voltage on scan tool. If TFT sensor signal voltage is less than .2 volt, go to next step. If TFT sensor signal voltage is more than .2 volt, check for open in TFT sensor ground circuit. Repair as necessary, then go to step 8). If circuit is okay, go to step 7).
  6. Turn ignition off. Disconnect jumper harness from VCM side of 20-pin connector and install on transmission side of 20-pin connector. Using a DVOM, measure resistance between terminals "L" and "M" of transmission 20-pin connector. If resistance is 3333-3689 ohms at 68°F (20°C), see DIAGNOSTIC AIDS. If resistance is not 3333-3689 ohms at 68°F (20°C), check for open in TFT sensor circuits. Repair as necessary, then go to step 8).
  7. Check for intermittent condition. Check VCM and connector for damaged or backed out terminals, weak terminal tension and poor connections. Repair as necessary, then go to next step. If terminals and connections are okay, replace VCM, then go to next step.
  8. After repair is complete, select DTC on scan tool. Select "Clear Info" function. Select "Specific DTC" and enter DTC "P0713". Ensure TFT sensor indicates a voltage less than 4.92 volts for 2 seconds. If DTC P0713 is not present, repair is complete. If DTC P0713 is still present, repeat test.
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