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P0706






P0706-TRANSMISSION RANGE SENSOR RATIONALITY







Theory of Operation

The C1 through C4 (T41, T42, T3, and T1) signal circuits communicate the shift lever position to the Powertrain Control Module (PCM). Each circuit is terminated at the transmission with a switch. 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 a certain combination of switch positions (open or closed), this is called a PRNDL code. There are four switches, therefore: there are many possible combinations of open and closed switches (codes). However, there are only nine valid codes (eight for AutoStick), one for each gear position and three recognized between gear (transition) codes. Any other switch combinations should never occur, these are called invalid codes. The following chart shows the normal switch states for each shift lever position.

- When Monitored:
Continuously with the ignition on in the run position.

- Set Condition:
The DTC will set if an invalid PRNDL code exists for more than 100 milliseconds within one second of power-up or if the PRNDL code error does not correct itself when (or before) the shift lever is moved to a different position (P, R, N, or OD), or if the PCM sees the PRNDL code rapidly (within 7 ms) jump across more than three shift lever detent positions.





Always perform the 40/41TE Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

TRS SWITCH STATES






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 Error Code:

- Go To 2

Test fails without Error Code:

- Perform the Gearshift Adjustment Procedure.
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST. 40/41TE Transmission Verification Test.

2. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY
1. Turn the ignition off to the lock position.
2. 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 possible serious or fatal injury.

NOTE: Check connectors - Clean/repair as necessary.

3. Install the Transmission Simulator 8333A and Electronic Transmission Adaptor Kit.
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: If the Shift Lever Position test fails, make sure to note the identification of the TRS Signal circuit for future reference.

Did the Shift Lever Position test pass?

Yes

- Remove the Oil Pan and Main Valve Body Assembly. Check for metal debris on top of the 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 TRS Assembly.
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST. 40/41TE Transmission Verification Test.

No

- Go To 3

3. TRS SIGNAL CIRCUIT OPEN
1. Turn the ignition off to the lock position.
2. Disconnect the Transmission Simulator 8333A and Electronic Transmission Adaptor Kit.
3. Disconnect the PCM C1 and C2 harness connectors.
4. Measure the resistance of the identified TRS Signal circuit (C1 - T41, C2 - T42, C3 - T3, and C4 - T1) between the PCM C1 and C2 harness connectors and the Transmission Solenoid/TRS Assembly harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the identified TRS Signal circuit (C1 - T41, C2 - T42, C3 - T3, and C4 - T1) for an open.
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST. 40/41TE Transmission Verification Test.

No

- Go To 4

4. TRS SIGNAL CIRCUIT SHORT TO GROUND
1. Measure the resistance between ground and the identified TRS Signal circuit (C1 - T41, C2 - T42, C3 - T3, and C4 - T1).

Is the resistance below 5.0 Ohms?

Yes

- Repair the identified TRS Signal circuit (C1 - T41, C2 - T42, C3 - T3, and C4 - T1) for a short to ground.
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST. 40/41TE Transmission Verification Test.

No

- Go To 5

5. TRS SIGNAL CIRCUIT SHORT TO OTHER CIRCUITS
1. Measure the resistance between the identified TRS Signal circuit (C1 - T41, C2 - T42, C3 - T3, and C4 - T1) and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.

Is the resistance below 100k Ohms between the identified TRS Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?

Yes

- Repair the identified TRS Signal circuit (C1 - T41, C2 - T42, C3 - T3, and C4 - T1) for a short to other circuit(s).
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST. 40/41TE Transmission Verification Test.

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. Check for any Service Bulletins that may apply. If no problems are found, replace and program the PCM. With the scan tool perform the Quick Learn procedure Quick Learn Procedure.
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST. 40/41TE Transmission Verification Test.

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.
5. Check for any Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST. 40/41TE Transmission Verification Test.

No

- Test Complete.

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