Pinpoint Test B: TFT Sensor

Pinpoint Tests - OSC Equipped Vehicle

Pinpoint Tests

PINPOINT TEST B: TFT SENSOR

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

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

NOTE: Read and record all DTCs.

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B1 ELECTRONIC DIAGNOSTICS


- Select PARK.
- Ignition OFF.
- Check to make sure the transmission vehicle harness C1274 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 C1274.
- Ignition ON.
- Access the Transmission Fluid Temperature (TFT) PID.
- Does the scan tool display -40°C (-40°F)?

Yes
GO to B3.

No
REPAIR the 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 C1274-3, circuit 359 (GY/RD), harness side and C1274-8, circuit 923 (OG/BK), harness side.




- Does the scan tool display 145°C-151°C (293°F-302°F)?

Yes
GO to B5.

No
GO to B4.

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B4 CHECK THE TFT INPUT CIRCUIT


- Measure the voltage between C1274-8, 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 vehicle harness circuit 923 (OG/BK) for an open. If an open circuit is not found, REPLACE the PCM. REFER to Computers and Control Systems. 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 C1274-8, 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 C1274-3, and C1274-8, 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
REPLACE the TFT sensor. CLEAR the DTCs. TEST the system for normal operation.

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