Pinpoint Test B : TFT (Transmission Fluid Temperature) Sensor

Pinpoint Tests - OSC Equipped Vehicle

Pinpoint Tests

PINPOINT TEST B : TFT (Transmission Fluid Temperature) SENSOR

NOTE: Refer to the Transaxle Vehicle Harness Connector illustrations within the Transaxle Connector Layouts procedure.

B1 ELECTRONIC DIAGNOSTICS

- Connect the scan tool.

- Check to make sure the transaxle harness connector is fully seated, pins are fully engaged in connector and in good condition before proceeding.

- Ignition ON.

- Select DataLogger.

- Select PID/TFT.

Does the vehicle enter DataLogger?

Yes
GO to B2.

No
REPEAT procedure to enter DataLogger. If vehicle did not enter DataLogger, REFER to Computers and Control Systems Information.

B2 TEMPERATURE SIGNAL CHECK

- Ignition ON.

- Select DataLogger.

- Select TFT PID.

- Monitor the TFT PID. The temperature value should be within -55°C to 175°C (-67°F to 347°F).

Is the Transmission Fluid Temperature (TFT) within specified range?

Yes
GO to B3.

No
GO to B4.

B3 WARM-UP/COOL-DOWN CYCLE

- While monitoring the TFT PIDs, carry out the following test: If transmission is cold, run transmission to warm it up. If transmission is warm, allow transmission to cool down.

Do the TFT PIDs increase as the transmission is warmed up, decrease as the transmission is cooled and does the TFT (Transmission Fluid Temperature) stay within the specified range?

Yes
INSTALL a new Transmission Control Module (TCM) and REFLASH to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to B4.

No
GO to B4.

B4 SIGNAL RESISTANCE

- Remove the TCM (Transmission Control Module).

- Inspect both sides of the TCM (Transmission Control Module) for damaged or pushed-out pins, corrosion or damaged seals.

- Measure the resistance between pins 7 and 8 at the transaxle bulkhead electrical connector. Refer to the following table.

Transmission Fluid Temperature (TFT) Sensor Resistance

° C° F Resistance (Ohms) 10 50 6.445 25 77 3.5 110 230 0.247





- Record the resistance.

Is the resistance within range?

Yes
GO to B5.

No
INSTALL a new internal harness and TFT (Transmission Fluid Temperature) assembly.

B5 SHORT TO GROUND

- Measure the resistance between pin 7 and ground at the transaxle bulkhead electrical connector.





- Measure the resistance between pin 8 and ground at the transaxle bulkhead electrical connector.





- Record the resistances.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new TCM (Transmission Control Module) and REFLASH to the latest level calibration.

No
INSTALL a new internal harness and TFT (Transmission Fluid Temperature) assembly.