Test B: Transmission Fluid Temperature Sensor
- Check TFT Sensor Resistance (Engine Cold)
Disconnect transaxle solenoid harness connector. Measure resistance between terminals No. 6 (component side) and No. 7 (component side) at transaxle solenoid harness connector C165. If resistance is about 2500 ohms, go to next step. If resistance is not about 2500 ohms, replace TFT sensor. - Check TFT PID
Turn ignition off. Connect transaxle solenoid harness connector. Connect NGS tester to DLC. Start engine. Access TFT PID. Measure voltage of TFT sensor while warming transaxle. Voltage should decrease from 1.5 volts with transaxle fluid at 68°F (20°C) to .5 volt at 186°F (86°C). If voltage is not as specified, go to next step. If voltage is as specified, replace TCM. - Check TFT Sensor Resistance (Engine Hot)
Start and run engine until warm. Turn ignition off. Disconnect transaxle solenoid harness connector C165. Measure resistance between terminals No. 6 (Orange wire) and No. 7 (component side) at transaxle solenoid harness connector C165. If resistance is about 300 ohms, go to next step. If resistance is not about 300 ohms, replace TFT sensor. - Check TFT Sensor Circuits
Turn ignition off. Disconnect TCM harness connector C277B. Measure resistance of Light Blue wire between terminal No. 23 at TCM harness connector C277B and terminal No. 7 at transaxle solenoid harness connector C165. Measure resistance of Orange wire between terminal No. 6 at transaxle harness connector and terminal No. 2 at Output Speed Sensor (OSS) harness connector C164. Resistance should be less than 5 ohms. Measure resistance of Light Blue wire between terminal No. 23 at TCM harness connector C277B and ground. See Figure , Figure and Fig 1 . Resistance should be greater than 10 k/ohms. If all resistance measurements are as specified, replace TCM. If any resistance measurement is not as specified, repair short to ground in appropriate circuit. See WIRING DIAGRAMS .
NOTE:
Vehicle must be at room temperature to perform this test.