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Pinpoint Test 2: Transaxle Fluid Temperature (TFT) Sensor: Notes

NOTE:
  • Refer to the transaxle connector illustrations and solenoid body leadframe internal wiring diagram preceding these pinpoint tests. See TRANSAXLE CONNECTOR LAYOUTS  .
TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR - PINPOINT TEST 2

PINPOINT TEST 2 TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR
STEP INSPECTION ACTION
1 ELECTRONIC DIAGNOSTICS
  • Check to make sure the transaxle vehicle harness 0518-C168a is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
  • Have the above items been checked? 
 Yes GO to the next step.
No CARRY OUT checks. ERASE the codes. REPEAT the self-test.
2 CHECK THE TFT SENSOR CIRCUITS FOR AN OPEN
  • Key in OFF position.
  • Disconnect Transaxle Vehicle Harness 0518-C168a.
  • Disconnect PCM transaxle harness 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 harness C175T-19, circuit VET27 (BN/YE) and transaxle vehicle harness 0518-C168a-2 circuit VET27 (BN/YE).
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  • Measure the resistance between PCM transaxle harness C175T-41, circuit RE406 (GY/VT) and transaxle vehicle harness 0518-C168a-1, circuit RE408 (GY/VT).
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  • Is the resistance less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the circuit(s) for an open. CONNECT all components. TEST the system for normal operation.
3 CHECK THE TFT SENSOR CIRCUITS FOR A SHORT TO GROUND
  • Disconnect: Catalyst Monitor Sensor (CMS) C141
  • Disconnect: Catalyst Monitor Sensor (CMS) C142
  • Measure the resistance between transaxle vehicle harness 0518-C168a-2, circuit VET27 (BR/Y) and ground.
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  • Measure the resistance between transaxle vehicle harness 0518-C168a-1, circuit RE406 (GY/V).
G06157621G06157621

  • Is the resistance greater than 10,000 ohms? 
 Yes GO to the next step.
No REPAIR the circuit(s) for a short to ground, CONNECT all components. TEST the system for normal operation.
4 CHECK THE TFT CIRCUITS FOR A SHORT TO VPWR
  • Measure the voltage between transaxle vehicle harness 0518-C168a-2, circuit VET27 (BR/Y) and ground.
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  • Measure the voltage between transaxle vehicle harness 0518-C168a-1, circuit RE406 (GY/V) and ground.
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  • 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 the next step.
5 CHECK THE RESISTANCE OF THE TFT SENSORS/HARNESS
  • Vehicle must be at normal operating temperature.
  • Connect transaxle vehicle harness 0518-C168a.
  • TEST 1 
  • Measure and record the resistance between PCM transaxle harness C175T-19, circuit VET27 (BR/Y) and C175T-41, circuit RE406 (GY/V).
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  • Compare the resistance value to the ranges in the table below.
  • 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 leadframe. See SOLENOID BODY LEADFRAME REMOVAL/INSTALLATION . RECONNECT all components. TEST the system for normal operation.
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