Pinpoint Test B: TFT Sensor
Pinpoint Tests - OSC Equipped Vehicle
PINPOINT TEST B: TFT SENSOR
NOTE: Refer to the Transaxle Vehicle Harness Connector illustration within the Transaxle Connector Layouts Transaxle Connector Layouts procedure.
NOTE: Refer to the Transaxle Internal Harness Connectors illustration within the Transaxle Connector Layouts Transaxle Connector Layouts procedure.
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B1 ELECTRONIC DIAGNOSTICS SET UP
- Make sure the transaxle harness connector is fully seated, terminals are fully engaged in the connector and in good condition before proceeding.
- Connect the scan tool.
- Ignition ON.
- Access the Transmission Fluid Temperature (TFT) PIDs.
- Is communication with the PCM established?
Yes
GO to B2 .
No
REPEAT procedure to access the TFT PIDs. If the scan tool cannot establish communication with the PCM, REFER to Computers and Control Systems for diagnosis of PCM.
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B2 WARM-UP/COOL-DOWN CYCLE VERIFICATION
- While monitoring the TFT PIDs, carry out the following test: If transaxle is cold, run transaxle to warm it up. If transaxle is warm, allow transaxle to cool down.
- Do the TFT PIDs increase as the transaxle is warmed up or decrease as the transaxle is cooled or does the TFT or TFTV drop in and out of range?
Yes
If the TFT PIDs increase as the transaxle is warmed or decrease as the transaxle is cooled, CLEAR all DTCs. ROAD TEST to verify if concern is still present. If concern is still present, REFER to Diagnosis By Symptom Diagnosis By Symptom to diagnose transaxle overheating. If the TFT drops in and out of range, INSPECT for intermittent concern in the internal/external harness, sensor or connector.
No
GO to B3.
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B3 CHECK VEHICLE HARNESS FOR A SHORT TO POWER
- Disconnect: Transaxle Vehicle Harness C199.
- Disconnect: PCM C175T.
- Visually inspect all wires and connectors for damage.
- Measure the voltage between transaxle vehicle harness C199-5, circuit 15S-TA17 (GN/OG) and ground.
- Measure the voltage between transaxle vehicle harness C199-4, circuit 9-TA36 (BN/GN) and ground.
- Is any voltage present?
Yes
REPAIR the circuit for a short to power. TEST the system for normal operation.
No
GO to B4.
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B4 CHECK THE VEHICLE HARNESS FOR A SHORT TO GROUND
- Measure the resistance between transaxle vehicle harness C199-5, circuit 15S-TA17 (GN/OG) and ground.
- Measure the resistance between transaxle vehicle harness C199-4, circuit 9-TA36 (BN/GN) and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to B5.
No
REPAIR the circuit for a short to ground. TEST the system for normal operation.
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B5 CHECK VEHICLE HARNESS FOR OPEN
- Measure the resistance between transaxle vehicle harness C199-5, circuit 15S-TA17 (GN/OG) and PCM C175T-19, circuit 15S-TA17 (GN/OG).
- Measure the resistance between transaxle vehicle harness C199-4, circuit 9-TA36 (BN/GN) and PCM C175T-40, circuit 9-PA1A (BN/RD).
- Is the resistance less than 5 ohms?
Yes
GO to B6.
No
REPAIR the circuit. TEST the system for normal operation.
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B6 CHECK THE RESISTANCE OF THE TFT SENSOR
- Measure the resistance between transaxle vehicle harness connector pin 5 (component side, transaxle internal harness), and transaxle vehicle harness connector pin 4 (component side, transaxle internal harness).
- Record the resistance.
- Resistance should be approximately in the following ranges:
- -20°C (-4°F) - 236-317 K ohms.
- 0°C (32°F) - 83.2-107 K ohms.
- 20°C (68°F) - 33.5-41.2 K ohms.
- 40°C (104°F) - 14.6-17.6 K ohms.
- 60°C (140°F) - 7.08-8.01 K ohms.
- 80°C (176°F) - 3.61-4.06 K ohms.
- 100°C (212°F) - 1.96-2.20 K ohms.
- 120°C (248°F) - 1.13-1.25 K ohms.
- 130°C (266°F) - 0.87-0.96 K ohms.
- Is the resistance in the range?
Yes
GO to B7.
No
GO to B8.
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B7 CHECK THE TRANSAXLE INTERNAL WIRING HARNESS FOR A SHORT TO GROUND
- Measure the resistance between transaxle vehicle harness connector pin 5 (component side, transaxle internal harness) and ground.
- Measure the resistance between transaxle vehicle harness connector pin 4 (component side, transaxle internal harness) and ground.
- Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair.
No
INSTALL a new transaxle internal harness. TEST the system for normal operation.
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B8 CHECK THE TRANSAXLE INTERNAL WIRING HARNESS FOR A SHORT
- Remove the transmission fluid pan. Refer to Transmission Fluid Pan Service and Repair.
- Disconnect the TFT sensor electrical connector.
- Measure the resistance between transaxle vehicle harness connector pin 5 (component side, transaxle internal harness) and ground.
- Measure the resistance between transaxle vehicle harness connector pin 4 (component side, transaxle internal harness) and ground.
- Measure the resistance between C199-4 and C199-5, component side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to B9.
No
INSTALL a new transaxle internal harness. TEST the system for normal operation.
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B9 CHECK THE TRANSAXLE INTERNAL HARNESS FOR AN OPEN
- Measure the resistance between transaxle vehicle harness connector pin 5 (component side, transaxle internal harness), and TFT sensor internal harness connector pin 5.
- Measure the resistance between transaxle vehicle harness connector pin 4 (component side, transaxle internal harness), and TFT sensor internal harness connector pin 4.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new TFT sensor.
No
INSTALL a new transaxle internal harness. TEST the system for normal operation.
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