7.(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
Ignition on, engine not running.
With the scan tool under TIPM, actuate the Transmission.
Measure the voltage of the (T50) L/R Pressure Switch Sense circuit.
Is the voltage above 0.5 volts?
Ye s>>
Repair the (T50) L/R PressureSwitch Sense circuit for a
short to voltage.
Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1.
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 the PCM
per the Service Information.With the scan tool, perform
QUICK LEARN
Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1. (Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - 42RLE - STANDARD PROCEDURE)
8.INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Test drive and verify if the transmission is launching in 2nd gear and/or noTCC engagement.
With the scan tool, check the DTC EVENT DATA to help identify the conditionsin which the DTC was set.
Are there 2nd gear launches and/or no TCC engagement?
Ye s>>
Disassemble and inspect the Valve Body per the Service Information and repair or replace as neces-
sary. If no problems are found in the Valve Body, replace the Transmission Solenoid Pressure Switch
Assembly.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
No>>
Te s t C o m p l e t e .
3.CHECK TO SEE IF DTC P1776 IS CURRENT
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?
Ye s>>
Go To 4
No>>
Go To 9
4.CHECK THE PCM AND WIRING USING THE TRANSMISSION SIMULATOR
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
startedingear.
WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in
personal injury or death.
Install the Transmission Simulator,Miller tool #8333 and the ElectronicTransmission Adapter kit.
Ignition on, engine not running.
With the Transmission Simulator, turn the Pressure Switch selector switchtoL/R.
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?
Ye s>>
Go To 5
No>>
Go To 6
5.CHECK THE SOLENOID SWITCH VALVE FOR STICKING
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 per the Service Information.
With the scan tool, record the DTC EVENT DATA for P1776 and erase DTCs.
Reassemble the transmission and test drive the vehicle. Try to duplicate the original set conditions using the DTC
EVENT DATA recorded earlier.
With the scan tool, check Transmission DTCs.
Did the DTC P1776 reset?
Ye s>>
Replace the Transmission Solenoid Assembly per the Service Information.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
No>>
Te s t C o m p l e t e
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
8.CHECK THE (T50) L/R PRESSURE SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE
Ignition on, engine not running.
With the scan tool under TIPM, actuate the Transmission.
Measure the voltage of the (T50) L/R Pressure Switch Sense circuit.
Is the voltage above 0.5 volts?
Ye s>>
Repair the (T50) L/R PressureSwitch Sense circuit for a
short to voltage.
Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1. (Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - 42RLE - 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 the PCM per the Service
Information. With the scan tool, perform QUICK LEARN.
Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1. (Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - 42RLE - STANDARD PROCEDURE)
9.INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Test Drive the vehicle and verify if the transmission is launching in 2nd gear and/or there is no TCC engagement.
With the scan tool, check the EVENT DATAto help identify the conditions in which the DTC was set.
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?
Ye s>>
Disassemble and inspect the Valve Body per the Service Information Inspect the Solenoid Switch Valve
for sticking in its bore and repair or replace as necessary.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
No>>
Te s t C o m p l e t e .
2.(T13) SPEED SENSOR GROUND CIRCUIT OPEN
Turn the ignition off to the lock position.
Disconnect the PCM C4 harness connector.
Disconnect the Input and Output Speed Sensor harness connectors.
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 per-
form diagnosis.
Measure the resistance of both of the (T13) Speed Sensor Ground cir-
cuits from the appropriate terminal of special tool #8815 to the Input
and Output Speed Sensor harness connectors.
Is the resistance above 5.0 ohms on either circuit?
Ye s>>
Repair the (T13) Speed Sensor Ground circuit for an open.
Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1. (Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - 42RLE - 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. If no problems are found, replace the PCM
per the Service Information.With the scan tool, perform
QUICK LEARN
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
3.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 specifictothiscircuit.
Wiggle the wires while checking for shorted and open circuits.
With the scan tool, check the DTC EVENT DATA to help identify the conditionsin which the DTC was set.
Were there any problems found?
Ye s>>
Repair as necessary.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
No>>
Te s t C o m p l e t e .
P1797-MANUAL SHIFT OVERHEAT
For a complete wiring diagramRefer to Section 8W.
When Monitored:
Continuously with engine running.
Set Condition:
If the Engine Temperature exceeds 123° C (255° F) or the Transmission Temperature exceeds 135° C (275° F)
while in AutoStick
mode. Note: Aggressive driving or driving in low for extended periods of time will set this
DTC.
Possible Causes
MANUAL SHIFT OVERHEAT
Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
Theory of Operation
The major cause of heat build up in the transmission is torque converter slip.WiththetransmissionintheAuto-
Stick
mode, the torque converter can slip during aggressive driving or heavy loading conditions such as trailer
towing or driving up steep grades. In the non AutoStick
mode, internal controller logic prevents the transmission
from overheating by managing the shift and EMCC schedule. In the AutoStick
mode, when the transmission or
engine temperature approaches an overheat condition, the manual shift overheat DTC sets and the AutoStick
mode is temporarily suspended until the temperature returns to normal.
Diagnostic Test
1.MANUAL SHIFT OVERHEAT
This is an informational DTC only.
With the scan tool, check the DTC EVENT DATA to help identify the conditionsin which the DTC was set.
Check the engine and transmission cooling system for proper operation.
Check the Radiator Cooling Fan operation.
Check the Transmission Cooling operation.
Check the Transmission Fluid Level per the Service Information to verify that it is not overfilled.
NOTE: Aggressive driving or driving in low for extended periods of time will set this DTC.
If there are no possible causes remaining, view repair.
Repair
If the Transmission Fluid is low, repair any Transmission Fluid leak as necessary and adjust the Trans-
mission Fluid Level per the Service Information. Refer to Service Information for the related symptoms
and repair as necessary.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
STANDARD PROCEDURE
PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 42RLE
For a complete wiring diagramRefer to Section 8W.
1.
Perform the following steps prior to any diagnostic procedure:
Many transmission symptoms can be caused by a low fluid level. If the fluid level is low, locate and repair any
leaks and fill the transmission to the proper fluid level. Refer to the Service Information for the proper repair
and fluid fill procedures.
Testing should only be performed with the battery fully charged to avoid false diagnosis.
With the scan tool, read Engine (PCM) DTCs. If Engine DTCs are present, refer to the Driveability Category
and perform to the appropriate diagnostic procedure(s) before proceeding.
With the scan tool, read Transmission (TCM) DTCs. Record all Stored, Active, and Pending DTC information.
Diagnose any Pending DTC as a matured DTC.
With the scan tool, read DTC EVENT DATA.Use this data to identify the conditions in which the DTC was set.
Note: Performing a Battery Disconnect will clear all DTC EVENT DATA and reset all learned Transmis-
sion values to the controllers default values, which may temporarily result in erratic shift schedules.
With the scan tool, perform the Shift Lever Position Test. If the test does not pass, refer to the diagnostic
procedure for P0706-Check Shifter Signal.
For Gear Ratio Error DTCs, use the scan tool to read and record the Clutch Volume Index (CVI) information.
Use the wiring diagram as a guide, inspect the wiring and connectors related to this circuit and repair as nec-
essary.
Refer to the When Monitored and Set Conditions for this DTC. DTCs can set at ignition on, at start up, driving
under specific conditions, and after controller diagnostic monitors haverun.
Refer to applicable Technical Service Bulletins (TSBs) for controller software update information. Some condi-
tions can be corrected by upgrading the Engine (PCM) or Transmission (TCM)controller software.
Check for any Service Information Tune-ups or Service Bulletins for any possible causes that may apply.
Were there any repairs made that fixed the vehicle?
Ye s>>
Testing complete.
Perform 42RLE VERIFICATION TEST - VER1(Referto21-TRANSMISSION/TRANSAXLE/AUTO-
MATIC - 42RLE - STANDARD PROCEDURE)
No>>
Refer to the Transmission category and perform the appropriate diagnostic procedure(s). (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - DIAGNOSIS AND TESTING)
42RLE TRANSMISSION VERIFICATION TEST - VER 1
1.
Perform the following after completion of a diagnostic repair:
Note: After completion of the Transmission Verification Test, the Powertrain Verification Test must be
performed. Refer to the Engine Category.
Reconnect any disconnected components.
With the scan tool, erase all Transmission and Engine DTCs.
Erase DTC P0700 under engine to turn off the MIL off after completion of transmission repairs.
Perform *PRNDL FAULT CLEARING PROCEDURE after completion of repairs for P0706-TRANSMISSION
RANGE SENSOR RATIONALITY.
If the Powertrain Control Module or the Transmission has been repaired or replaced, it is necessary to perform
the scan tool Quick Learn Procedure.
If the Torque converter has been replaced, with the scan tool perform TCC BREAK-IN.
If the Powertrain Control Module or Front Control Module has been replacedyoumustresetthePinionFactor
in the Front Control Module.
With the scan tool, display Transmission Temperature. Start and run the engine until the Transmission Tem-
perature is HOT, above 43° C or 110° F.
Check the transmission fluid and adjust if necessary. Refer to the ServiceInformation for the Fluid Fill proce-
dure.
Road test the vehicle. With the scan tool, monitor the engine RPM. Make 15 to20 1-2, 2-3, 3-4 upshifts.
Perform these shifts from a standing start to 45 mph with a constant throttleopeningof20to25degrees.
With speeds below 25 MPH, make 5 to 8 wide open throttle kickdowns to 1st gear. Allow at least 5 seconds
each in 2nd and 3rd gear between each kickdown.
For a specific DTC, drive the vehicle to the Symptom’s When Monitored/WhenSet conditions to verify the DTC
is repaired.
If equipped with AutoStick, upshift and downshift several times using the AutoStickfeature during the road
test.
Note: Use the OBDII task manager to run a Good Trip in each gear, this will confirm the repair and to
ensure that the DTC has not re-matured.
Check for any Diagnostic Trouble Codes (DTCs) during and after the road test.
Did any Diagnostic Trouble Codes set during the road test?
Ye s>>
Repair is not complete. Refer to the Transmission category and perform theappropriate symptom(s).
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - DIAGNOSIS AND TESTING)
No>>
Repair is complete.
page page
AUTOMATIC TRANSMISSION 42RLE - SERVICE
INFORMATION
DESCRIPTION ............................... 391
OPERATION ................................. 393
DIAGNOSIS AND TESTING
AUTOMATIC TRANSMISSION ............... 398
ROAD TEST ............................... 399
HYDRAULIC PRESSURE TESTS............ 400
CLUTCH AIR PRESSURE TESTS........... 402
FLUID LEAKAGE.......................... 403
STANDARD PROCEDURE - ALUMINUM
THREAD REPAIR .......................... 404
REMOVAL ................................... 404
DISASSEMBLY .............................. 406
ASSEMBLY .................................. 428
INSTALLATION .............................. 451
SCHEMATICS AND DIAGRAMS
42RLE - WITHOUT VARIABLE LINE
PRESSURE............................... 455
42RLE - WITH VARIABLE LINE PRESSURE . . 469
SPECIFICATIONS
42RLE AUTOMATIC TRANSMISSION ........ 479
SPECIAL TOOLS
42RLE AUTOMATIC TRANSMISSION ........ 481
ACCUMULATOR
DESCRIPTION ............................... 485
OPERATION ................................. 486
SEAL-ADAPTER HOUSING
REMOVAL ................................... 487
INSTALLATION .............................. 487
BEARINGS
ADJUSTMENTS
BEARING ADJUSTMENT PROCEDURES.... 488
MECHANISM-BRAKE TRANSMISSION SHIFT
INTERLOCK
DESCRIPTION ............................... 489
OPERATION ................................. 489
DIAGNOSIS AND TESTING - BRAKE
TRANSMISSION SHIFT INTERLOCK ......... 489
ADJUSTMENTS - BRAKE TRANSMISSION
SHIFT INTERLOCK ......................... 489
CLUTCHES-DRIVING
DESCRIPTION ............................... 491
OPERATION ................................. 491
SEAL-EXTENSION HOUSING
REMOVAL ................................... 492
INSTALLATION .............................. 492
FLUID AND FILTER
DIAGNOSIS AND TESTING
CAUSES OF BURNT FLUID ................. 493EFFECTS OF INCORRECT FLUID LEVEL . . . . 493
FLUID CONTAMINATION ................... 493
STANDARD PROCEDURE
FLUID LEVEL CHECK...................... 493
FLUID/FILTER SERVICE .................... 494
TRANSMISSION FILL ...................... 495
CABLE-GEARSHIFT
DIAGNOSIS AND TESTING - GEARSHIFT
CABLE .................................... 496
REMOVAL ................................... 496
INSTALLATION .............................. 497
ADJUSTMENTS - GEARSHIFT CABLE ......... 498
CLUTCHES-HOLDING
DESCRIPTION ............................... 499
OPERATION ................................. 499
ASSEMBLY-INPUT CLUTCH
DISASSEMBLY .............................. 500
ASSEMBLY .................................. 509
SENSOR-INPUT SPEED
DESCRIPTION ............................... 523
OPERATION ................................. 523
REMOVAL ................................... 523
INSTALLATION .............................. 524
SENSOR-VARIABLE LINE PRESSURE
DESCRIPTION ............................... 525
OPERATION ................................. 525
REMOVAL ................................... 525
INSTALLATION .............................. 526
PUMP-OIL
DESCRIPTION ............................... 527
OPERATION ................................. 527
DISASSEMBLY .............................. 527
ASSEMBLY .................................. 529
SENSOR-OUTPUT SPEED
DESCRIPTION ............................... 530
OPERATION ................................. 530
REMOVAL ................................... 530
INSTALLATION .............................. 531
GEARTRAIN-PLANETARY
DESCRIPTION ............................... 532
OPERATION ................................. 532
SEAL-OIL PUMP
REMOVAL ................................... 533
INSTALLATION .............................. 533
SOLENOID-PRESSURE CONTROL
DESCRIPTION ............................... 534
OPERATION ................................. 534
REMOVAL ................................... 534
INSTALLATION .............................. 535