Pinpoint Test B: Transmission Fluid Temperature (TFT) Sensor

5R55S

Pinpoint Tests - OSC Equipped Vehicle

Pinpoint Tests

PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR

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

NOTE: Refer to the Transmission Internal Harness illustration Transmission Connector Layouts Transmission Connector Layouts.

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B1 ELECTRONIC DIAGNOSTICS


- Select PARK.
- Ignition OFF.
- Check to make sure the transmission vehicle harness C199 is fully seated, terminals are fully engaged in the connector and are in good condition before proceeding.
- Connect the scan tool.
- Ignition ON.
- Access the transmission PIDs.
- Is the scan tool able to access the transmission PIDs?

Yes
GO to B2.

No
REPEAT procedure to access the transmission PIDs. If the scan tool did not access the transmission PIDs, REFER to Computers and Control Systems Information for diagnosis of PCM.

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B2 ELECTRICAL SIGNAL CHECK


- Ignition OFF.
- Disconnect: Transmission Vehicle Harness C199.
- Ignition ON.
- Access the TFT PID.
- Does the scan tool display 145°C-151°C (293°F-302°F)?

Yes
GO to B3.

No
REPAIR the transmission vehicle harness circuit 923 (OG/BK) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.

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B3 CHECK THE VEHICLE HARNESS SIGNAL CIRCUIT


- Connect a fused jumper between C199-12, circuit 359 (GY/RD), harness side and C199-2, circuit 923 (OG/BK), harness side.




- Does the scan tool display -40°C (-40°F)?

Yes
GO to B5.

No
GO to B4.

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B4 CHECK THE TFT INPUT CIRCUIT


- Measure the voltage between C199-2, circuit 923 (OG/BK), harness side and ground.




- Is the voltage between 4.8 and 5.1 volts?

Yes
GO to B5.

No
INSPECT the transmission vehicle harness circuit 923 (OG/BK) for an open. If an open circuit is not found, REPLACE the PCM. TEST the system for normal operation.

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B5 CHECK THE RESISTANCE OF THE TRANSMISSION INTERNAL HARNESS


- Measure the resistance between the transmission internal harness C199-2, component side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to B6.

No
REPLACE the transmission internal harness. CLEAR the DTCs. TEST the system for normal operation.

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B6 CHECK RESISTANCE OF THE TRANSMISSION INTERNAL HARNESS/TFT SENSOR


- Measure the resistance between the transmission internal harness C199-2, and C199-12, component side using the following chart.

Transmission Fluid Temperature (TFT):

- Is the resistance value correct?

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

No
REPLACE the TFT sensor. CLEAR the DTCs. TEST the system for normal operation.

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