Jeep Liberty KJ. Manual — part 1022
5.
CHECK THE (T59) UD SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (T59) UD Solenoid
Control circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T59) UD Solenoid Control circuit for a short to
ground.
Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1. (Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - 42RLE - STANDARD PROCEDURE)
No
>> Go To 6
6.
CHECK THE (T59) UD SOLENOID CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
Remove the Transmission Control Relay.
NOTE: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the (A104) Fused B+ circuit and the
(T16) Transmission Control Relay Output circuit in the Transmission
Control Relay connector.
Ignition on, engine not running.
Measure the voltage of the (T59) UD Solenoid Control circuit.
Is the voltage above 0.5 volts?
Yes
>> Repair the (T59) UD Solenoid Control 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)
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
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7.
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 specific to this circuit.
Wiggle the wires while checking for shorted and open circuits.
With the scan tool, check the DTC EVENT DATA to help identify the conditions in which the DTC was set.
Were there any problems found?
Yes
>> Repair as necessary.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
No
>> Test Complete.
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
21 - 133
P0841-LR PRESSURE SWITCH RATIONALITY
42RLE MINI SOL PRS CKTS
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
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For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Whenever the engine is running.
•
Set Condition:
The DTC is set if one of the pressure switches are open or closed at the wrong time in a given gear. If the
problem is identified for 3 successive key starts, the transmission will go into Limp-in mode and the MIL will
turn on after 10 seconds of vehicle operation.
Possible Causes
RELATED TRANSMISSION RELAY DTCS PRESENT
LOSS OF PRIME DTC PRESENT
(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
TRANSMISSION SOLENOID/PRESSURE SWITCH ASSEMBLY
POWERTRAIN CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 42RLE - DIAGNOSIS AND TESTING).
Theory of Operation
The Transmission system uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD ele-
ments. The pressure switches are continuously monitored for the correct states in each gear. If a set condition is
identified, 1st gear and torque converter lock-up (EMCC) will be inhibited. The vehicle will launch in 2nd gear and
shift normally through the gears without allowing EMCC. If during the same key start, the set condition is no longer
valid, the transmission will return to normal operation (1st and EMCC available). Limp-in will not occur unless DTC
P0841 is accompanied by a code P0706 and the MIL will illuminate after 5 minutes of substituted operation.
PRESSURE SWITCH STATES
GEAR
L/R
2/4
OD
R
OP
OP
OP
P/N
CL
OP
OP
1st
CL
OP
OP
2nd
OP
CL
OP
D
OP
OP
CL
OD
OP
CL
CL
OP = OPEN
CL = CLOSED
Diagnostic Test
1.
DETERMINING IF RELATED TRANSMISSION RELAY DTCS ARE PRESENT
With the scan tool, read Transmission DTCs
Are there any Transmission Control Relay DTCs present also?
Yes
>> Refer to the Transmission category and perform the appropriate symptom.
No
>> Go To 2
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
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