Pinpoint Test B: TFT Sensor

Pinpoint Tests - OSC Equipped Vehicle

Pinpoint Tests

PINPOINT TEST B: TFT SENSOR

NOTE: Refer to the Transmission Vehicle Harness Connector illustration within the Transmission Connector Layouts Transmission Connector Layouts procedure.

NOTE: Refer to the Transmission Leadframe Connector illustration within the Transmission Connector Layouts Transmission Connector Layouts procedure.

NOTE: If the scan tool is unable to access the transmission PIDs, refer to Computers and Control Systems Information.

NOTE: Read and record all DTCs.

-------------------------------------------------
B1 CHECK TFT INPUT SIGNAL

- Ignition OFF.
- Disconnect: Transmission Vehicle Harness C1575.
- Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: TFT PIDs: TFT and TFTV.
- Does the TFT PID display -40°C (-40°F) and the TFTV PID display 4.96 to 5.10 volts?

Yes
GO to B2.

No
REPAIR vehicle harness circuit VET27 (BN/YE) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.

-------------------------------------------------
B2 CHECK TFT SIGNAL INPUT CIRCUIT FOR VOLTAGE

- Measure the voltage between the transmission vehicle harness C1575-6, circuit VET27 (BN/YE), harness side and ground.




- Is the voltage between 4.8 and 5.1 volts?

Yes
GO to B3.

No
INSPECT and REPAIR transmission vehicle harness circuit VET27 (BN/YE) for an open. If an open circuit is not found, REPLACE the PCM, REFER to Electronic Engine Controls Service and Repair. PROGRAM the PCM with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy Solenoid Body Strategy. TEST the system for normal operation.

-------------------------------------------------
B3 CHECK TFT SIGNAL RETURN CIRCUIT

- Connect a fused jumper between the transmission vehicle harness C1575-5 and C1575-6, harness side.




- Does the TFT PID display 190°-195°C (374°-383°F) and the TFTV PID display 0 volts?

Yes
GO to B4.

No
INSPECT and REPAIR the transmission vehicle harness signal return circuit for an open. If an open circuit is not found, REPLACE the PCM, REFER to Electronic Engine Controls Service and Repair. PROGRAM the PCM with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy Solenoid Body Strategy. TEST the system for normal operation.

-------------------------------------------------
B4 CHECK TFT SENSOR RESISTANCE

- Measure the resistance between the transmission molded leadframe C1575-5 and C1575-6, component side using the following chart.

TRANSMISSION FLUID TEMPERATURE (TFT)








- Does the temperature to resistance specifications match?

Yes
REFER to Diagnosis By Symptom Diagnosis By Symptom to diagnose an overheating concern.

No
INSPECT and CLEAN the TFT sensor on the molded leadframe for metallic contamination. INSTALL a new molded leadframe if no debris was found, REFER to Shift Solenoids (SS) Service and Repair. CLEAR the DTCs. TEST the system for normal operation.

-------------------------------------------------