P0706-TRANSMISSION RANGE SENSOR RATIONALITY

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Lionel Pearson
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1 Page 1 of DTC-Based Diagnostics/MODULE, Powertrain Control (PCM), 545RFE/Diagnosis and Testing P0706-TRANSMISSION RANGE SENSOR RATIONALITY Special Tools: Click to display a list of tools used in this procedure

2 Page 2 of 7 For a complete wiring diagram, refer to the Wiring Information.

3 Page 3 of 7 Theory of Operation The T41 (C1) T42 (C2), T3 (C3), T1 (C4), or 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 five 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 of a second. TRS SENSE CIRCUIT OPEN TRS SENSE CIRCUIT SHORTED TO GROUND TRS SENSE CIRCUIT SHORTED TO VOLTAGE METAL DEBRIS IN OIL PAN TRANSMISSION RANGE SENSOR (TRS) POWERTRAIN CONTROL MODULE (PCM) Possible Causes Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC- Based SHIFT LEVER ERROR CODES ERROR CODE SWITCH STUCK POSITION 1 T41 (C1) OPEN 2 T41 (C1) CLOSED 3 T42 (C2) OPEN 4 T42 (C2) CLOSED 5 T3 (C3) OPEN

4 Page 4 of 7 6 T3 (C3) CLOSED 7 T1 (C4) OPEN 8 T1 (C4) CLOSED 9 T2 (C5) OPEN 10 T2 (C5) CLOSED 11 OD LOCKOUT OPEN 12 OD LOCKOUT CLOSED TRS SWITCH STATES PARK TMP 1 REV TMP 2 N1 N2 TMP 3 D TMP 4 2 TMP 5 L T41 (C1) T42 (C2) T3 (C3) T1 (C4) T2 (C5) CL OP OP OP CL CL OP OP OP OP OP OP CL CL CL CL CL CL CL OP OP OP OP OP OP OP OP CL CL CL CL CL OP OP OP CL OP OP OP OP OP CL CL CL CL CL OP OP CL CL OP OP OP OP OP OP OP CL CL CL 1. CHECK TO SEE IF P0706 DTC IS CURRENT 1. With the scan tool, perform the Shift Lever Position Test. Select the test outcome from the following: Test passes: Go To 6 Test fails with DTC: Go To 2 Test fails without DTC:

5 Page 5 of 7 Perform the Gearshift Adjustment Procedure in accordance with the Service Information. 2. ASSEMBLY-TRANSMISSION SOLENOID/TRS 1. Turn the ignition off to the lock position. 2. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - Response condition. 3. Install Transmission Simulator 8333A. 4. Ignition on, engine not running. 5. With the scan tool, perform the Shift Lever Position Test. 6. 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. 7. The LED for the gear position in question must be illuminated on the Transmission Simulator prior to pressing "ENTER" on the scan tool. NOTE: 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 a an error code 11 or OD- TOW/HALL STUCK OPEN. NOTE: 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? Remove the Oil Pan and Main Valve Body Assembly in accordance with 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 repair transmission as necessary. If no problems are found, replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Go To 3

6 Page 6 of 7 3. TRS SENSE CIRCUIT OPEN 1. Turn the ignition off to the lock position. 2. Disconnect the Transmission Simulator 8333A. 3. Disconnect the PCM harness connectors and install the PCM Pinout Box 8815A. CAUTION: 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 the PCM Pinout Box 8815A to perform diagnosis. 4. Measure the resistance of the identified (T41, T42, T3, T1, or T2 (C1-C5) TRS Sense circuit, between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the PCM Pinout Box 8815A. Is the resistance above 5.0 Ohms? Repair the identified (T41, T42, T3, T1, or T2 (C1-C5) TRS Sense circuit for an open. Go To 4 4. TRS SENSE CIRCUIT SHORT TO GROUND 1. Measure the resistance between ground and the identified (T41, T42, T3, T1, or T2 (C1-C5) TRS Sense circuit. Is the resistance below 5.0 Ohms? Repair the identified (T41, T42, T3, T1, or T2 (C1-C5) TRS Sense circuit for a short to ground. Go To 5 5. TRS SENSE CIRCUIT SHORT TO OTHER CIRCUITS 1. Measure the resistance between the identified (T1, T2, T3, T41, or T42) TRS Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.

7 Page 7 of 7 Is the resistance below 100k Ohms between the identified (T41, T42, T3, T1, or T2 (C1-C5) TRS Sense circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Repair the identified (T41, T42, T3, T1, or T2 (C1-C5) TRS Sense circuit for a short to other circuit(s). 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 and program the PCM in accordance with the Service Information. With the scan tool, perform Quick Learn. 6. CHECK THE WIRING AND CONNECTORS 1. The conditions necessary to set the DTC are not present at this time. 2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. 3. Wiggle the wiring and connectors while checking for shorted and open circuits. 4. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set. Were there any problems found? Repair as necessary. Test Complete.

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