Automatic Transmission - 6F35
Diagnostic Routine B
Diagnostic Overview
P0710, P0711, P0712, P0713, P1711
Refer to Wiring Diagram Set 30 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
The TFT (Transmission Fluid Temperature) sensor is located in the solenoid body leadframe. The resistance value of the TFT (Transmission Fluid Temperature) sensor varies with temperature change. The TCM (Transmission Control Module) monitors the voltage drop across the TFT (Transmission Fluid Temperature) sensor to determine the temperature of the transmission fluid. When the ignition is turned to the RUN position, the TCM (Transmission Control Module) uses this initial input signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows delayed shifts when the transmission fluid is cold, which helps warm the transmission fluid. The TCM (Transmission Control Module) inhibits TCC (Torque Converter Clutch) operation at low transmission fluid temperatures and adjusts line pressure to temperature.
When TFT (Transmission Fluid Temperature) or the TFT (Transmission Fluid Temperature) circuits are faulted, harsh or soft shifts may occur.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Inspect for damaged wiring harness(es)
- Inspect for loose or damaged connectors
Pinpoint Test
NOTE: If the scan tool is unable to communicate with the TCM (Transmission Control Module), REFER to Diagnostic Routine AB: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool Diagnostic Routine AB.
1. INSPECT FOR CORROSION OR TERMINAL DAMAGE
1. Ignition OFF.
2. Disconnect the 6F35 Transmission C1520A.
3. Disconnect the TCM (Transmission Control Module).
4. Use a mirror to inspect both ends of the connectors for damage or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
Are both connectors free of any damage, corrosion, pushed-out terminals, loose wires, or missing or damaged seals?
2. CHECK THE TFT (Transmission Fluid Temperature) SENSOR CIRCUITS FOR AN OPEN
1. Measure:
Is the resistance less than 5 ohms?
3. CHECK THE TFT (Transmission Fluid Temperature) SENSOR CIRCUITS FOR A SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
4. CHECK THE TFT (Transmission Fluid Temperature) CIRCUITS FOR A SHORT TO VOLTAGE
1. Ignition ON.
2. Measure:
Is any voltage present?
5. CHECK THE RESISTANCE OF THE TFT (Transmission Fluid Temperature) SENSOR AT OPERATING TEMPERATURE
1. Ignition OFF.
2. Connect the 6F35 Transmission C1520A.
3. Connect the TCM (Transmission Control Module).
4. Bring the transmission to normal operating temperature.
5. Ignition OFF.
6. Disconnect the 6F35 Transmission C1520A.
7. Disconnect the TCM (Transmission Control Module).
8. Measure and record:
9. Compare the recorded resistance value to the following table ranges:
Temperature to Resistance
Is the resistance in range?
6. CHECK THE RESISTANCE OF THE TFT (Transmission Fluid Temperature) SENSOR WHEN COLD
1. Allow the transmission to cool to ambient temperature.
2. Measure and record:
3. Compare the recorded resistance value to the following table ranges:
Temperature to Resistance
Is the resistance in range?
7. CHECK THE TCM (Transmission Control Module) FOR CORRECT OPERATION
1. Prior to reconnecting any previously disconnected connector:
- inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
- inspect wire harness for any damaged, pinched, cut or pierced wires.
2. Connect the 6F35 Transmission C1520A.
3. Connect the TCM (Transmission Control Module).
4. Ignition ON.
5. Using a scan tool, perform TCM (Transmission Control Module) self-test to retrieve DTCs (Diagnostic Trouble Codes).
Is the concern still present?
