Pinpoint Test F: TSS Sensor

4R70E/4R75E

Pinpoint Tests

PINPOINT TEST F: TSS SENSOR

NOTE: Refer to the Turbine Shaft Speed (TSS) Sensor Harness Connector illustration in Transmission Connector Layouts Transmission Connector Layouts.

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

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F1 ELECTRONIC DIAGNOSIS


- Select PARK.
- Ignition OFF.
- Check to make sure the transmission vehicle harness C1274 and the Turbine Shaft Speed (TSS) sensor C143 are fully seated, pins 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 F2.

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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F2 DRIVE CYCLE TEST


- While monitoring the TSS PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
- Does the TSS PID increase and decrease with engine and vehicle speed?

Yes
REFER to Diagnosis By Symptom Diagnosis By Symptom for concern diagnosis.

No
If the TSS PID does not increase and decrease with engine and vehicle speed or if the sensor signal is erratic or the sensor signal is consistent/unchanging output, GO to F3.

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F3 CHECK THE TRANSMISSION VEHICLE HARNESS FOR OPENS


- Ignition OFF.
- Disconnect: PCM C175T.
- Disconnect: TSS Sensor C143.
- Measure the resistance between PCM C175T and TSS sensor C143, harness side using the following table.









- Is the resistance less than 5 ohms?

Yes
GO to F4.

No
REPAIR the transmission vehicle harness circuit for an open. CLEAR the DTCs. TEST the system for normal operation

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F4 CHECK THE TRANSMISSION VEHICLE HARNESS FOR SHORT TO GROUND


- Measure the resistance between PCM C175T-15, circuit 970 (DG/WH), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to F5.

No
REPAIR the transmission vehicle harness circuit 970 (DG/WH) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.

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F5 CHECK RESISTANCE OF THE TSS SENSOR


- Measure the resistance between the TSS sensor pins 1 and 2, component side.




- Is the resistance within 480-590 ohms at 25°C (77°F)?

Yes
REPLACE the PCM. CLEAR the DTCs. TEST the system for normal operation.

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

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