P1775-SOLENOID SWITCH VALVE LATCHED IN TCC 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 LR solenoid is energized. When the solenoid switch valve is in the downshifted position and the LR solenoid is energized, fluid is directed to the LR element for 1st gear. When the solenoid switch valve is In the up-shifted position (2nd, 3rd, and 4th gear) and the LR solenoid is energized, fluid is directed into the Lockup Switch Valve which controls the Torque Converter Clutch. When shifting into 1st gear, a special sequence is followed to insure solenoid switch valve movement into the downshifted position. The LR pressure switch is monitored to confirm switch valve movement. If the solenoid switch valve movement is not confirmed (i.e. no LR pressure when the LR solenoid is energized), 2nd gear is substituted for 1st. No 1st gear (2nd gear is substituted). The transmission Torque converter FEMCC operation is inhibited. MIL on after 5 min. of substituted operation.


  • When Monitored:

    Prior to a shift into 1st gear.

  • Set Condition:

    Transmission temperature must be hot. DTC is set after six unsuccessful attempts to shift into 1st gear.


Possible Causes
  
RELATED DTC P0841 PRESENT
  
(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
  
INTERNAL TRANSMISSION
  
POWERTRAIN CONTROL MODULE
  

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



Diagnostic Test

1.DETERMINING IF RELATED DTCS 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 TO SEE IF DTC P1775 IS CURRENT



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

Yes
  • Go To 3


No
  • Go To 8

3.PCM AND WIRING



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


No
  • Go To 4

4.(T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT 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 Special Tool #8815 to perform diagnosis.



NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.



Does the test light illuminate brightly on all Transmission Control Relay Output circuits?

Yes


No
  • Go To 5

5.(T50) L/R PRESSURE SWITCH SENSE CIRCUIT OPEN





Is the resistance above 5.0 ohms?

Yes


No
  • Go To 6

6.(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND





Is the resistance below 5.0 ohms?

Yes


No
  • Go To 7

7.(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE



NOTE: The jumper wire must still be in place in the Transmission Control Relay connector.





Is the voltage above 0.5 volts?

Yes
  • Repair the (T50) L/R Pressure Switch Sense circuit for a short to voltage.
  • Perform 42RLE 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. 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)

8.INTERMITTENT WIRING AND CONNECTORS





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

Yes


No
  • Test Complete.