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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - 4L60-E >> Diagnostic Tests >> DTC P0713: TFT Sensor Circuit - High Input >> Diagnostic Procedure

Diagnostic Procedure

  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. Check transmission fluid level. Fill if necessary. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Go to next step.
  3. Connect scan tool to DLC. Turn ignition on, engine off. Using scan tool, record freeze frame and failure records for reference, and then clear DTCs. Using scan tool, read TFT sensor signal voltage. If TFT sensor signal voltage is less than 4.92 volts, see DIAGNOSTIC AIDS . If TFT sensor signal voltage is not less than 4.92 volts, go to next step.
  4. Turn ignition off. Disconnect transmission 20-pin in-line harness connector. Connect appropriate jumper harness to engine side of in-line harness connector. Connect a fused jumper wire between terminals "L" and "M" of jumper harness. Turn ignition on, engine off. If TFT sensor signal voltage decreases to less than .2 volt, go to next step. If TFT sensor signal voltage does not decrease to less than .2 volt, go to step  8.
  5. Turn ignition off. Connect appropriate jumper harness to transmission side of in-line harness connector. Measure resistance between terminals "L" and "M" of jumper harness. If resistance is 3088-3942 ohms at 68°F (20°C), or 159-198 ohms at 212°F (100°C), see DIAGNOSTIC AIDS . If resistance is not as specified, go to next step.
  6. Check for open in TFT sensor signal and ground circuits between transmission 20-pin in-line harness connector and TFT sensor. If circuit(s) is faulty, go to step  10. If circuits are okay, go to next step.
    7. NOTE: TFT sensor is part of TFP manual valve position switch.
  7. Replace TFT sensor assembly. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step  12.
  8. Check TFT sensor signal circuit for open or short to voltage between transmission 20-pin in-line harness connector and PCM. Repair as necessary. After repairs, go to step  12. If circuit is okay, go to next step.
  9. Check for open in TFT sensor ground circuit. Repair as necessary. After repairs, go to step  12. If circuit is okay, go to step  11.
  10. Replace transmission wire harness assembly. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step  12.
  11. Replace PCM. After replacement, program PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, go to next step.
  12. Using scan tool, clear DTCs. Turn ignition on, engine off. Ensure TFT sensor indicates a voltage less than 4.9 volts for 7 minutes. Check for DTCs. If DTC P0713 does not return, system is okay. If DTC P0713 returns, go to step  1.
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