Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1995CAVALIER LS, 4D SEDAN, 2.2 4REPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSAXLE DIAGNOSIS - 4T40-EDIAGNOSTIC TESTSP0712, TRANS. FLUID TEMPERATURE (TFT) SENSOR CIRCUIT (LOW INPUT)DIAGNOSTIC PROCEDURES
1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4
Diagnostic Procedures
1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4SECTION Diagnostic Procedures
- Connect scan tool to DLC. Turn ignition switch to ON position. DO NOT start engine. Using scan tool, record failure records for reference. Data will be lost when DTCs are cleared later in this test.
- Select "TFT sensor" on scan tool. If scan tool displays transaxle fluid temperature at 304°F (151°C), go to next step. If scan tool does not display transaxle fluid temperature at 304°F (151°C), see Diagnostic Aids.
- Turn ignition off. Disconnect transaxle 20-pin connector. Turn ignition switch to ON position. If scan tool displays transaxle fluid temperature at -40°F, go to next step. If scan tool does not display transaxle fluid temperature at -40°F, check for short to ground in Yellow/Black wire between transaxle 20-pin connector (PCM side) and PCM. Repair wire as necessary, then go to step 6). If wire is okay, replace PCM, then go to step 6).
- Install Jumper Harness (J-39775) to transaxle side of 20-pin connector. Connect ohmmeter between terminals "L" and "M" (Yellow/Black wire and Black wire) of 20-pin connector. If resistance is 3106-3923 ohms at 68°F (20°C) and 164-190 ohms at 212°F (100°C), replace PCM then go to step 6).
- If resistance is not 3106-3923 ohms at 68°F (20°C) and 164-190 ohms at 212°F (100°C), check for short to ground in Yellow/Black wire between transaxle 20-pin connector and TFT sensor connector. Repair wire as necessary, then go to next step. If wire is okay, replace PSA then go to next step.
- After repair is complete, select DTC on scan tool. Select "Clear Info" function. Select "Specific DTC" and enter DTC "P0712". Turn ignition switch to ON position for more than 3 seconds. TFT signal voltage must be more than .33 volts. If DTC P0712 is not present, repair is complete. If DTC P0712 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.