Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

DETERMINING IF RELATED DTCS ARE PRESENT
1. With the scan tool, check for other Transmission DTCs.
  Is the DTC P0841 present also?
  
  Yes
  - Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Go to step 2
CHECK THE Event Data FOR TRS CODE TR2
1. With the scan tool, check the Event Data for P1776.
  Does the Event Data show a TRS Code of TR2?
  
  Yes
  - This indicates the shift lever and the manual control valve were in an invalid position between Neutral and OD. Check the shifter cable for: proper adjustment, binding, friction, improper routing, or the shifter was moved in transit. Repair as necessary.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go To step 3
CHECK TO SEE IF DTC P1776 IS CURRENT
1. With the scan tool, check the Starts Since Set counter for P1776.
  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 step 4
  No
  - Go to step 9
CHECK THE PCM AND WIRING USING THE TRANSMISSION SIMULATOR
1. Turn the ignition off to the lock position.
2. Remove the Starter Solenoid Relay from the TIPM.
  CAUTION: Removal of the Starter Solenoid Relay from the TIPM will prevent the vehicle from being started in gear.
  
  WARNING: The Starter Solenoid Relay must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury.
3. Install the Transmission Simulator, Miller tool #8333A and the Electronic Transmission Adapter kit.
4. Ignition on, engine not running.
5. With the Transmission Simulator, turn the Pressure Switch selector switch to L/R.
6. With the scan tool, monitor the L/R Pressure Switch State while pressing the Pressure Switch Test button.
  Did the Pressure Switch state change from open to closed when the test button was pressed?
  
  Yes
  - Go to step 5
  No
  - Go to step 6
CHECK THE SOLENOID SWITCH VALVE FOR STICKING
1. Remove the transmission oil pan and Valve body and inspect the Solenoid Switch Valve for sticking in its bore, repair or replace as necessary.
  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 in accordance with the Service Information.
2. With the scan tool, record the Event Data for P1776 and erase DTCs.
3. Reassemble the transmission and test drive the vehicle. Try to duplicate the original set conditions using the Event Data recorded earlier.
4. With the scan tool, check Transmission DTCs.
  Did the DTC P1776 reset?
  
  Yes
  - Replace the Transmission Solenoid Assembly in accordance with the Service Information.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Test Complete
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
CHECK THE (T50) L/R PRESSURE SWITCH SENSE CIRCUIT FOR AN OPEN

Fig 1: CHECKING L/R PRESSURE SWITCH SENSE CIRCUIT FOR AN OPEN
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the PCM C4 harness connector.
3. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
  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 8815 to perform diagnosis.
4. Measure the resistance of the (T50) L/R Pressure Switch Sense circuit between the Transmission Solenoid/Pressure Switch Assembly harness connector and the appropriate terminal of Miller tool #8815.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (T50) L/R Pressure Switch Sense circuit for an open.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 7
CHECK THE (T50) L/R PRESSURE SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND

Fig 2: CHECKING L/R PRESSURE SWITCH SENSE CIRCUIT FOR SHORT TO GROUND
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (T50) L/R Pressure Switch Sense circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T50) L/R Pressure Switch Sense circuit for a short to ground.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 8
CHECK THE (T50) L/R PRESSURE SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE

Fig 3: CHECKING L/R PRESSURE SWITCH SENSE CIRCUIT FOR SHORT TO VOLTAGE
Courtesy of CHRYSLER LLC
1. Ignition on, engine not running.
2. With the scan tool under TIPM, actuate the Transmission.
3. Measure the voltage of the (T50) L/R Pressure Switch Sense circuit.
  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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  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 in accordance with the Service Information. With the scan tool, perform Quick Learn.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Test drive the vehicle and verify if the transmission is launching in 2nd gear and/or there is no TCC engagement.
3. With the scan tool, check the EVENT DATA to help identify the conditions in which the DTC was set.
4. Check for any Service Information Tune-ups or Service Bulletins for possible causes that may apply.
  Are there 2nd gear launches and/or no TCC engagement?
  
  Yes
  - Disassemble and inspect the Valve Body in accordance with the Service Information Inspect the Solenoid Switch Valve for sticking in its bore and repair or replace as necessary.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Test Complete.