For a complete wiring diagram Refer to Section 8W.The Transmission Temperature Sensor is a variable resistor that changes with temperature, or otherwise known as a thermistor. The temperature of the transmission fluid can affect a variety of electronically controlled transmission operations such as shift quality, torque converter clutch engagement, and when and/or if certain OBDII or system self-diagnostic test are performed. The Powertrain Control Module (PCM) substitutes a calculated transmission temperature value if a fault is detected in the Transmission Temperature Sensor circuit.When Monitored:Continuously with the ignition on and engine running.Set Condition:The DTC will set when the monitored Temperature Sensor voltage rises above 4.94 volts for the period of 0.45 seconds.Possible CausesRELATED DTCS PRESENT(T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO OTHER CIRCUITSTRANSMISSION TEMPERATURE SENSORPOWERTRAIN CONTROL MODULEAlways perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting Procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) 1. DETERMINE IF RELATED DTC'S ARE PRESENTWith the scan tool, check Transmission DTCs.Are there any line pressure sensor or throttle position sensor DTCs present?YesRefer to the Transmission category and perform the appropriate symptom.NoGo To 22. CHECK IF DTC IS CURRENTWith the scan tool, check the STARTS SINCE SET counter for P0713.This counter only applies to the last DTC set.Is the STARTS SINCE SET counter 2 or less?YesGo To 3NoGo To 53. TRANSMISSION TEMPERATURE SENSORTurn the ignition off to the lock position.Remove the Ignition Switch Feed fuse from the TIPM.Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in personal injury or death.Install the Transmission Simulator, Miller tool #8333.Ignition on, engine not running.With the Transmission Simulator, turn the Input/Output switch to OFF.With the scan tool, monitor the TRANS TEMP VOLTS while turning the Thermistor Voltage switch to all three positions on the Transmission Simulator.Compare the scan tool readings with the numbers listed on the Transmission Simulator.Do the readings on the Transmission Simulator match the scan tool readings ± 0.2 volts?YesReplace Transmission Solenoid/TRS assembly per the Service Information.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) NoGo To 44. (T54) TRANSMISSION SENSOR SIGNAL CIRCUIT SHORT TO ANOTHER CIRCUIT

Turn the ignition off to the lock position.Disconnect the Transmission Simulator, Miller tool #8333.Disconnect the PCM harness connectors.Measure the resistance between the (T54) Transmission Temperature Sensor Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.Is the resistance below 5.0 ohms between the (T54) Transmission Temperature Sensor Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?YesRepair the Transmission Temperature Sensor Signal circuit for a short to another circuit(s).Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) NoUsing the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) 5. INTERMITTENT WIRING AND CONNECTORSThe conditions necessary to set this DTC are not present at this time.Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.Wiggle the wires while checking for shorted and open circuits.With the scan tool, check the DTC EVENT DATA to help identify the conditions in which the DTC was set.Were there any problems found?YesRepair as necessary.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) NoTest Complete.