P1776-SOLENOID SWITCH VALVE LATCHED IN LR POSITION





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The Solenoid Switch Valve, an internal, hydraulically operated valve, controls the direction of the transmission fluid when the L/R solenoid is energized. When the solenoid switch valve is in the downshifted position and the L/R solenoid is energized, fluid is directed to the L/R element for 1st gear. When the solenoid switch valve is In the up-shifted position (2nd, 3rd, and 4th gear) and the L/R solenoid is energized, fluid is directed into the Lockup Switch Valve which controls the Torque Converter Clutch. When doing PEMCC or FEMCC, the L/R pressure switch should indicate no pressure if the solenoid switch valve is in the LU position. If the L/R pressure switch indicates pressure for some time while in partial or full EMCC, the EMCC operation is aborted and momentarily inhibited to avoid accidental application of the L/R clutch. EMCC is attempted again when there is no L/R pressure. The fourth detection of L/R pressure while in PEMCC or FEMCC will result in setting the DTC.Torque converter EMCC operation inhibited. MIL on after 5 min. of substituted operation.


  • When Monitored:

    Every 7 ms when doing PEMCC or FEMCC.

  • Set Condition:

    Must be in partial or full EMCC. The DTC is set if L/R pressure is detected high for the fourth time.


Possible Causes
  
RELATED DTC P0841 PRESENT
  
DTC EVENT DATA SHOWS TRS CODE TR2 - SHIFT LEVER OR MANUAL CONTROL VALVE IN A INVALID POSITION
  
SHIFTER CABLE OUT OF ADJUSTMENT
  
SOLENOID SWITCH VALVE STICKING IN ITS BORE
  
(T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
  
(T50) L/R PRESSURE SWITCH SENSE CIRCUIT OPEN
  
(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
  
(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
  
VALVE BODY
  
POWERTRAIN CONTROL MODULE
  

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)



Diagnostic Test

1.DETERMINING IF RELATED DTC'S ARE PRESENT



Is the DTC P0841 present also?

Yes
  • Refer to the Transmission category and perform the appropriate symptom.


No
  • Go To 2

2.CHECK THE DTC EVENT DATA FOR TRS CODE TR2



Does the DTC EVENT DATA show a TRS Code of TR2?

Yes


No
  • Go To3

3.CHECK TO SEE IF DTC P1776 IS CURRENT


NOTE: This counter only applies to the last DTC set.



Is the status Active or is the STARTS SINCE SET counter 2 or less for this DTC?

Yes
  • Go To 4


No
  • Go To 9

4.CHECK THE PCM AND WIRING USING THE TRANSMISSION SIMULATOR



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 can result in personal injury or death.


NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition.







Did the Pressure Switch state change from open to closed when the test button was pressed?

Yes
  • Go To 5


No
  • Go To 6

5.CHECK THE SOLENOID SWITCH VALVE FOR STICKING


NOTE: This DTC may be caused by debris lodged in the Transmission Solenoid Switch Valve bore. If debris is found, clean the valve body and reassemble the transmission per the Service Information.






Did the DTC P1776 reset?

Yes


No

6.CHECK THE (T50) L/R PRESSURE SWITCH SENSE CIRCUIT FOR AN OPEN






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.




Is the resistance above 5.0 ohms?

Yes


No
  • Go To 7

7.CHECK THE (T50) L/R PRESSURE SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND





Is the resistance below 5.0 ohms?

Yes


No
  • Go To 8

8.CHECK THE (T50) L/R PRESSURE SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE








Is the voltage above 0.5 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. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace and program the PCM per the Service Information. With the scan tool, perform QUICK LEARN.
  • Perform 42RLE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)

9.INTERMITTENT WIRING AND CONNECTORS






Are there 2nd gear launches and/or no TCC engagement?

Yes


No
  • Test Complete.