P0706-TRANSMISSION RANGE SENSOR RATIONALITY





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The 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.



Possible Causes
TRS SENSE CIRCUIT OPEN
TRS SENSE CIRCUIT SHORT TO GROUND
TRS SENSE CIRCUIT SHORT TO VOLTAGE
METAL DEBRIS IN OIL PAN
TRANSMISSION RANGE SENSOR
POWERTRAIN CONTROL MODULE

Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting Procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)


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
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)
CLOSED
 		OPEN
 		OPEN
 		OPEN
 		CLOSED
 		CLOSED
 		OPEN
 		OPEN
 		OPEN
 		OPEN
 		OPEN
 		OPEN
T42 (C2)
CLOSED
 		CLOSED
 		CLOSED
 		CLOSED
 		CLOSED
 		CLOSED
 		CLOSED
 		OPEN
 		OPEN
 		OPEN
 		OPEN
 		OPEN
T3 (C3)
OPEN
 		OPEN
 		OPEN
 		CLOSED
 		CLOSED
 		CLOSED
 		CLOSED
 		CLOSED
 		OPEN
 		OPEN
 		OPEN
 		CLOSED
T1 (C4)
OPEN
 		OPEN
 		OPEN
 		OPEN
 		OPEN
 		CLOSED
 		CLOSED
 		CLOSED
 		CLOSED
 		CLOSED
 		OPEN
 		OPEN
T2 (C5)
CLOSED
 		CLOSED
 		OPEN
 		OPEN
 		OPEN
 		OPEN
 		OPEN
 		OPEN
 		OPEN
 		CLOSED
 		CLOSED
 		CLOSED



Diagnostic Test

1. CHECK TO SEE IF P0706 DTC IS CURRENT

With the scan tool, perform the Shift Lever Position Test.

Select the test outcome from the following:

Test passes:


Test fails with Error Code:


Test fails without Error Code:

2. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY

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 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.

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 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?

Yes


No

3. TRS SENSE CIRCUIT OPEN

Turn 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.

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 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?

Yes


No

4. TRS SENSE CIRCUIT SHORT TO GROUND

Measure 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?

Yes


No

5. TRS SENSE CIRCUIT SHORT TO OTHER CIRCUITS

Measure 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?

Yes


No

6. INTERMITTENT WIRING AND CONNECTORS

The 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?

Yes


No