Pinpoint Test B: TFT Sensor

6F50

Pinpoint Tests - OSC Equipped Vehicle

Pinpoint Tests

PINPOINT TEST B: TFT SENSOR

NOTE: Refer to the Transaxle Vehicle Harness Connector illustration Transaxle Connector Layouts Symptom Related Diagnostic Procedures.

NOTE: Refer to the Transaxle Internal Harness Diagram illustration Transaxle Connector Layouts Symptom Related Diagnostic Procedures.

-------------------------------------------------
B1 ELECTRONIC DIAGNOSTICS


- Check to make sure transaxle vehicle harness connector C168 is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
- Have the above items been checked?

Yes
GO to B2.

No
CARRY OUT checks. CLEAR the DTCs. REPEAT the Self Test.

-------------------------------------------------
B2 CHECK THE TFT SENSOR CIRCUITS FOR AN OPEN


- Ignition OFF.
- Disconnect: Transaxle Vehicle Harness C168.
- Disconnect: PCM Transaxle C175T.
- Use a mirror to inspect both ends of the connector for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
- Measure the resistance between PCM transaxle C175T-20, circuit VET27 (BN/YE) and transaxle vehicle harness C168-2, circuit VET27 (BN/YE).




- Measure the resistance between PCM transaxle C175T-43, circuit RE406 (GY/VT) and transaxle vehicle harness C168-3, circuit RE406 (GY/VT).




- Is the resistance less than 5 ohms?

Yes
GO to B3.

No
REPAIR the circuit(s) for an open. CONNECT all components. TEST the system for normal operation.

-------------------------------------------------
B3 CHECK THE TFT SENSOR CIRCUITS FOR A SHORT TO GROUND


- Measure the resistance between transaxle vehicle harness C168-2, circuit VET27 (BN/YE) and ground.




- Measure the resistance between transaxle vehicle harness C168-3, circuit RE406 (GY/VT) and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to B4.

No
REPAIR the circuit(s) for a short to ground. CONNECT all components. TEST the system for normal operation.

-------------------------------------------------
B4 CHECK THE TFT CIRCUITS FOR A SHORT TO VPWR


- Measure the voltage between transaxle vehicle harness C168-2, circuit VET27 (BN/YE) and ground.




- Measure the voltage between transaxle vehicle harness C168-3, circuit RE406 (GY/VT) and ground.




- Is any voltage present?

Yes
REPAIR the circuit(s) for a short to voltage. CONNECT all components. TEST the system for normal operation.

No
GO to B5.

-------------------------------------------------
B5 CHECK THE RESISTANCE OF THE TFT SENSORS/HARNESS


- Vehicle must be at normal operating temperature.
- Connect: Transaxle Vehicle Harness C168.
- TEST 1.
- Measure and record the resistance between PCM transaxle C175T-20, circuit VET27 (BN/YE) and C175T-43, circuit RE406 (GY/VT).




- Compare the resistance value to the following table ranges:

Transmission Fluid Temperature:

- TEST 2.
- Check for intermittent short or open.
- If the resistance was between 0.8k and 100k ohms, carry out the following test. If the transaxle is warm, allow it to cool. Check the TFT sensor resistance again. Compare the resistance with the initial resistance. The resistance should decrease if the transaxle was heated and should increase if the transaxle was allowed to cool. If correct, then change in the resistance occurs, repeat OBD.
- Is the resistance in the range?

Yes
INSTALL a new PCM. CONNECT all components. TEST the system for normal operation.

No
INSTALL a new solenoid body. REFER to Solenoid Body Assembly Solenoid Body Assembly. RECONNECT all components. TEST the system for normal operation.

-------------------------------------------------