P0706-TRANSMISSION RANGE SENSOR RATIONALITYFor a complete wiring diagram Refer to Section 8W.Theory of OperationThe T41 (C1), T42 (C2), T3 (C3), T1 (C4), T2 (C5) Sense circuits communicate the shift lever position to the Transmission Control System. Each circuit is terminated at the transmission by a
switch (TRS). Each switch can be either open or closed, depending on the shift lever position. The PCM can decode this information and determine the shift lever position. Each shift lever position has it own unique combination of closed and open switches. This is called a PRNDL code. There are 5 switches, therefore: there are many possible combinations of open
and closed switches (codes). There are 12 valid codes: two for neutral, one for each other gear position (5), and five temporary (transition zone) codes. The remainder of the codes should never occur, these
are called invalid codes.When Monitored:Continuously with the ignition on.Set Condition:The DTC will set if the controller detects an invalid PRNDL code which lasts for more than 0.042 seconds.
Possible CausesTRS SENSE CIRCUIT OPENTRS SENSE CIRCUIT SHORT TO GROUNDTRS SENSE CIRCUIT SHORT TO VOLTAGEMETAL DEBRIS IN OIL PANTRANSMISSION RANGE SENSORPOWERTRAIN CONTROL MODULE
Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting Procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC
- 45RFE/545RFE - STANDARD PROCEDURE)
Diagnostic Test1.CHECK TO SEE IF P0706 DTC IS CURRENTWith the scan tool, perform the Shift Lever Position Test.Select the test outcome from the following:Test passes:Go To 6Test fails with Error Code:Go To 2Test fails without Error Code:Perform the Gearshift Adjustment Procedure per the Service Information.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)2.CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLYTurn 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 Transmission Simulator, Miller tool #8333.Ignition on, engine not running.With the scan tool, perform the Shift Lever Position Test.When the scan tool instructs you to put the Gear Selector in a particular position, you must do so using the selector switch on the Transmission Simulator.The LED for the gear position in question must be illuminated on the Transmission Simulator prior to pressing "ENTER" on the scan tool.When the scan tool requests the O/D off button be depressed, you must use the O/D OFF button in the vehicle or you will fail the Shift Lever Position Test with an error
code 11 or OD-TOW/HALL STUCK OPEN.If the Shift Lever Position test fails, make sure to note the identification of the TRS Sense circuit for future reference.Did the Shift Lever Position test pass?YesRemove the Oil Pan and Main Valve Body Assembly per the Service Information. Check for metal debris on top of the Solenoid/TRS Assembly and the manual valve
code plate. If debris is present, determine the cause of the debris and repair the transmission as necessary. If no problems are found, replace the Transmission Solenoid/TRS Assembly per the Service Information.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)No Go To 33.TRS SENSE CIRCUIT OPENTurn the ignition off to the lock position.Disconnect the Transmission Simulator, Miller tool #8333.Disconnect the PCM C4 harness connector and install Miller tool #8815.Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller
tool #8815 to perform diagnosis.Measure the resistance of the identified (T41 (C1), T42 (C2), T3 (C3), T1 (C4), T2 (C5)) TRS Sense circuit, from the Transmission Solenoid/TRS Assembly harness connector to the appropriate
terminal of Miller tool #8815.Is the resistance above 5.0 ohms?YesRepair the identified (T41 (C1), T42 (C2), T3 (C3), T1 (C4), T2 (C5)) TRS Sense circuit for an open.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST.NoGo To 44.TRS SENSE CIRCUIT SHORT TO GROUNDMeasure the resistance between ground and the identified (T41 (C1), T42 (C2), T3 (C3), T1 (C4), T2 (C5)) TRS Sense circuit.Is the resistance below 5.0 ohms?YesRepair the identified (T41 (C1), T42 (C2), T3 (C3), T1 (C4), T2 (C5)) TRS Sense circuit for a short to ground.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)NoGo To 55.TRS SENSE CIRCUIT SHORT TO OTHER CIRCUITSMeasure the resistance between the identified (T41 (C1), T42 (C2), T3 (C3), T1 (C4), T2 (C5)) TRS Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.Is the resistance below 100k ohms between the identified (T41 (C1), T42 (C2), T3 (C3), T1 (C4), T2 (C5))TRS Sense circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness
connector?YesRepair the identified (T41 (C1), T42 (C2), T3 (C3), T1 (C4), T2 (C5)) TRS Sense circuit for a short to other 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)6.INTERMITTENT WIRING AND CONNECTORSThe conditions necessary to set the DTC are not present at this time.Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.Wiggle the wiring and connectors 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.