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HOMESERVICE MANUALSCHEVROLET1997CHEVY VAN G2500, VAN CARGO EXTENDED, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION DIAGNOSIS - 4L60-ESELF-DIAGNOSTIC TESTSDTC P0711: TRANS. FLUID TEMPERATURE (TFT) SENSOR CIRCUIT (RANGE/PERFORMANCE)DIAGNOSTIC PROCEDURE
1997 Chevrolet Chevy Van G2500, Van Cargo Extended, 6.5 F

Diagnostic Procedure

1997 Chevrolet Chevy Van G2500, Van Cargo Extended, 6.5 FSECTION Diagnostic Procedure
  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. Select "TFT" on scan tool. Drive vehicle and observe scan tool for either of the following fail conditions: TFT does not change more than 2.7°F (1.5°C) in 7 minutes since start-up, or TFT changes more than 36°F (20°C) in .200 seconds, 14 times within 7 seconds (out of range change). If either of these conditions occurred, go to next step. If neither of these conditions occurred, cause is intermittent. See DIAGNOSTIC AIDS.
  3. If scan tool displays a condition in which TFT does not change by more than 2.7°F (1.5°C) in 7 minutes since start-up, go to step 5). If scan tool does not display a condition in which TFT does not change by more than 2.7°F (1.5°C) in 7 minutes since start-up, go to next step.
  4. Turn ignition off. Disconnect transmission 20-pin connector. Install Jumper Harness (J-39775) on engine side of transmission 20-pin connector. Connect test light between terminals "L" and "M". See Figure . Turn ignition switch to ON position. DO NOT start engine. While observing scan tool, wiggle engine wiring harness from appropriate PCM connector to transmission 20-pin connector. If TFT temperature changes by more than 36°F (20°C), go to step 6). If TFT temperature does not change by more than 36°F (20°C), go to step 7).
  5. Turn ignition off. Disconnect transmission 20-pin connector. Turn ignition switch to ON position. DO NOT start engine. If scan tool displays a condition in which TFT does not change by more than 2.7°F (1.5°C) in 7 minutes since start-up, replace PCM, then go to step 8). If scan tool does not display a condition in which TFT does not change by more than 2.7°F (1.5°C) in 7 minutes since start-up, replace TFT sensor, then go to step 8).
  6. Check for intermittent open or short condition in TFT sensor circuits between PCM connector and transmission 20-pin connector. Repair circuit(s) as necessary, then go to step 8). If circuits are okay, replace PCM, then go to step 8).
  7. Check for intermittent open or short condition in TFT sensor circuits between transmission 20-pin connector and TFT sensor. Repair circuit(s) as necessary, then go to next step. If circuits are okay, replace TFT sensor, 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 "P0711". Road test vehicle. Monitor transmission fluid temperature. Ensure that rise in fluid temperature is more than 4°F (2.25°C) within 11 seconds since start-up, and fluid temperature does not change by more than 36°F (20°C) within .200 seconds for a period of at least 11 seconds. If DTC P0711 is not present, repair is complete. If DTC P0711 is still present, repeat test.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.