P0714-TRANSMISSION TEMPERATURE SENSOR INTERMITTENT
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The Transmission Temperature Sensor is a variable resistor that changes with temperature, or otherwise known as a thermister. The temperature of the transmission fluid can affect a variety of
electronically controlled transmission operations such as shift quality, torque converter lock-up, 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.
Possible Causes
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RELATED DTCS PRESENT
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TRANSMISSION TEMPERATURE SENSOR
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POWERTRAIN CONTROL MODULE
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Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting Procedure before proceeding.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC
- 45RFE/545RFE - STANDARD PROCEDURE)
Diagnostic Test
1.
DETERMINE IF RELATED DTC'S ARE PRESENT
With the scan tool, check Transmission DTCs.
Are there any line pressure sensor or throttle position sensor DTCs present?
Yes
Refer to the Transmission category and perform the appropriate symptom.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC
- 45RFE/545RFE - DIAGNOSIS AND TESTING)
No
2.
CHECK TO SEE IF DTC IS CURRENT
With the scan tool, Check the STARTS SINCE SET counter for P0714.
NOTE:
This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter 2 or less?
Yes
No
3.
TRANSMISSION TEMPERATURE SENSOR
Turn the ignition off to the lock position.
Remove the Ignition Switch Feed fuse from the TIPM.
CAUTION:
Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear.
WARNING:
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 a non-fluctuating scan tool reading +/- 0.2 volts?
Yes
No
-
Using 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)
4.
INTERMITTENT WIRING AND CONNECTORS
The 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?
Yes
No