Jeep Liberty KJ. Manual — part 1171
14.
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT OPEN
Turn the ignition off to the lock position.
Remove the Transmission Simulator, Miller tool #8333.
Disconnect the TCM harness connector.
Measure the resistance of the (T48) 4C Pressure Switch Sense circuit
from the Transmission Solenoid/TRS Assembly harness connector to
the appropriate terminal of the TCM harness connector.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (T48) 4C Pressure Switch Sense circuit for an
open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1. (Refer to 21 - TRANSMISSION/TRANS-
AXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PRO-
CEDURE)
No
>> Go To 15
15.
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (T48) 4C Pressure
Switch Sense circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T48) 4C Pressure Switch Sense circuit for a
short to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1. (Refer to 21 - TRANSMISSION/TRANS-
AXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PRO-
CEDURE)
No
>> Go To 16
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)
KJ
16.
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHER CIRCUITS
Disconnect the TCM harness connector.
Disconnect the Transmission Solenoid/TRS Assembly harness connec-
tor.
NOTE: Make sure the Transmission Solenoid/TRS Assembly har-
ness connector is disconnected.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the (T48) 4C Pressure Switch Sense
circuit and all other circuits in the Transmission Solenoid/TRS Assembly
harness connector.
Is the resistance below 5.0 ohms between the (T48) 4C Pres-
sure Switch Sense circuit and any other circuit(s) in the Trans-
mission Solenoid/TRS Assembly harness connector?
Yes
>> Repair the (T48) 4C Pressure Switch Sense circuit for a
short to other circuit(s).
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1. (Refer to 21 - TRANSMISSION/TRANS-
AXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PRO-
CEDURE)
No
>> Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion,
damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems
are found, replace the TCM per the Service Information. With the scan tool, perform QUICK LEARN.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)
17.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this 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.
If the DTC EVENT DATA shows the DTC P0987 set while the Line Pressure was significantly below the Desired
Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter
or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the
Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and
related wiring.
Where there any problems found?
Yes
>> Repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)
No
>> Test Complete.
KJ
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)
21 - 629
P0988-4C PRESSURE SWITCH RATIONALITY
For a complete wiring diagram Refer to Section 8W
21 - 630
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)
KJ
•
When Monitored:
Continuously with the ignition on, engine running, with the transmission in gear.
•
Set Condition:
The DTC is set if the 4C Pressure Switch reads open or closed at the wrong time in a given gear.
Possible Causes
RELATED TCM POWER INPUT DTCS PRESENT
DTC P0871 ALSO PRESENT
LOSS OF 12-VOLT FEED
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT OPEN
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
EXCESSIVE FLUID LEAKAGE WITH 2C CLUTCH CIRCUIT
#5 AND/OR #7 CHECK BALL CUT OR DAMAGED
LOW LINE PRESSURE
TRANSMISSION SOLENOID/TRS ASSEMBLY
TRANSMISSION CONTROL MODULE
WIRING AND CONNECTORS
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)
Theory of Operation
The Transmission system uses five pressure switches to monitor the fluid pressure in the LR, 2C, 4C, UD, and OD
clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown.
GEAR
L/R
2C
4C
UD
OD
REVERSE
OPEN
OPEN
OPEN
OPEN
OPEN
P/N
CLOSED
OPEN
OPEN
OPEN
OPEN
1ST
CLOSED*
OPEN
OPEN
CLOSED
OPEN
2ND
OPEN
CLOSED
OPEN
CLOSED
OPEN
2ND PRIME
OPEN
OPEN
CLOSED
CLOSED
OPEN
DRIVE
OPEN
OPEN
OPEN
CLOSED
CLOSED
4TH
OPEN
OPEN
CLOSED
OPEN
CLOSED
5TH
OPEN
CLOSED
OPEN
OPEN
CLOSED
*L/R is closed if output speed is below 100 rpm in Drive and Manual 2. L/R is open in Manual 1.
Diagnostic Test
1.
DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT
With the scan tool, read Transmission DTCs
Are there any TCM Power Input DTCs present also?
Yes
>> Refer to the Transmission category and perform the appropriate symptom.
No
>> Go To 2
KJ
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)
21 - 631
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