Pinpoint Test B: TFT Sensor

Pinpoint Tests - OSC Equipped Vehicle

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.

NOTE: Read and record all DTCs.

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B1 CHECK TFT SENSOR SIGNAL INPUT


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

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B2 CHECK TFT SENSOR SIGNAL CIRCUIT


- Connect a fused jumper between the transmission vehicle harness C1575-5, circuit RE406 (GY/VT) and C1575-6, circuit VET27 (BN/YE).




- Does the scan tool display 191°-198°C (376°-388°F) and 0.0 to 0.2 volts?

Yes
GO to B4.

No
GO to B3.

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B3 CHECK TFT SENSOR SIGNAL VOLTAGE


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




- Is the voltage between 4.8 and 5.1 volts?

Yes
GO to B4.

No
INSPECT and REPAIR 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.

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B4 CHECK TFT SENSOR RESISTANCE


- Measure the resistance between the transmission 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 Main Control Overhaul. CLEAR the DTCs. TEST the system for normal operation.

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