Jeep Liberty KJ. Manual - part 1134

CHECK INTERNAL TRANSMISSION

Repair internal transmission as necessary. Refer to the Service Information.

If there were any line pressure DTCs present along with this DTC, make sure to inspect the: Primary oil filter and
seal, Transmission Oil Pump, and the Main regulator valve per the Service Information.

If DTCs P0876 and/or P0875 were present in addition to the P0731, replace the Transmission Solenoid/TRS Assem-
bly in addition to necessary internal repairs.

Pay particular attention to the following list of possible causes when repairing the transmission:

•

Cut UD piston seal

•

Failed overrunning clutch

•

Cut UD accumulator seal ring

•

Broken UD accumulator piston

•

Low line pressure

•

Broken/missing main valve body bleed orifice

•

Broken/missing dribbler orifice assembly in reaction shaft support

•

Poor machining on pump valve body face

•

Transmission Solenoid/TRS Assembly

View repair

Repair

Repair internal transmission per the Service Information.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)

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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)

P0732-GEAR RATIO ERROR IN 2ND

For a complete wiring diagram Refer to Section 8W

•

When Monitored:
Continuously with the ignition on, engine running, with the transmission in gear.

•

Set Condition:
If the ratio of the Input RPM to the Output RPM does not match the current gear ratio. This DTC can take up
to five minutes of problem identification before illuminating the MIL

Possible Causes

RELATED DTC’S PRESENT

INPUT SPEED SENSOR OR WIRING

LOW FLUID LEVEL

CRACKED OR MIS-INSTALLED PRIMARY OIL FILTER OR SEAL

WORN SOLENOID SWITCH VALVE OR PLUGS

STUCK OR STICKING MAIN REGULATOR VALVE

BURNED UD OR 2C CLUTCH

CUT 2C OR UD PISTON SEAL

BROKEN 2C PISTON CASTING

BROKEN OR MISSING 2C BLEED ORIFICE

BROKEN OR MISSING UD BLEED ORIFICE

CUT 2C OR UD ACCUMULATOR PISTON SEAL

CRACKED 2C OR UD ACCUMULATOR PISTON

CUT OR MISSING #5 OR #7 CHECK BALL

TRANSMISSION SOLENOID/TRS ASSEMBLY

BROKEN WELD - REACTION CARRIER TO REVERSE SUN GEAR

MISSING TEETH ON INPUT CLUTCH HUB TONE WHEEL

Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting Procedure before proceeding. (Refer to
21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)

Theory of Operation

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM.
These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through
the following checks:

1) Once in a particular gear, if the gear ratio varies from the correct gear ratio, the corresponding in-gear trouble
code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent may result in the DTCs P0715 and/or
P0720 being set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the pulses from the input speed
sensor when at a stop in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the
output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause
the DTC P1794 to set.

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)

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Diagnostic Test

CHECK FOR RELATED DTCS

With the scan tool, check for other transmission DTCs.

Are there any Transmission: solenoid, line pressure, speed sensor, and/or loss of prime DTCs present?

Yes

>> Refer to appropriate symptom in the Transmission category. Perform the test for P0944-LOSS OF

PRIME first if it is present.

>> Go To 2

CHECK IF DTC IS CURRENT

With the scan tool, read and record the DTC EVENT DATA.

NOTE: Make sure to record all DTC EVENT DATA stored in the scan tool for future reference in this test
procedure.

Does the DTC EVENT DATA display information for the DTC P0732?

Yes

>> Go To 4

>> Go To 3

CHECK DTC EVENT DATA

In the DTC EVENT DATA, identify the DTC that was recorded earlier.

Does the DTC EVENT DATA display information for the DTC P1790, with target gear = 2nd, or with both
2C and UD clutches applying?

Yes

>> Go To 4

>> Go To 7

CHECK RPM IN DTC EVENT DATA

Refer to the DTC EVENT DATA recorded earlier.

Does the Input RPM read zero?

Yes

>> Check the input speed sensor and wiring. Refer to test P0715 and diagnose as if the DTC is current.

>> Go To 5

CHECK LINE PRESSURE READING

Refer to the DTC EVENT DATA recorded earlier.

Is the line pressure reading more than 10 psi below the desired line pressure?

Yes

>> Go To 6

>> Go To 7

CHECK TRANSMISSION OIL FILTER

Turn the ignition off to the lock position.

Remove and inspect the Transmission Oil Pan for excessive debris per the Service Information.

Remove and inspect the Primary Oil Filter per the Service Information.

NOTE: Make sure the Primary Transmission Oil Filter and seal are properly installed and are not cracked or
split.

Does the Oil Pan contain excessive debris and/or is the Primary Oil Filter cracked, plugged or mis-in-

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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)

stalled?

Yes

>> Repair the plugged, cracked, or split Primary Transmission Oil Filter and/or seal. If excessive clutch

debris is present, check the clutches for damage. Refer to the Service Information for the proper
hydraulic clutch repair procedure.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)

>> Remove the Transmission Oil Pump per the Service Information. Check the main Regulator Valve for

sticking in its bore, scoring, and/or damage and clean and repair as necessary. If no problem is found,
replace the Transmission Solenoid/TRS Assembly.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)

CHECK IF THE DTC P0732 IS CURRENT

With the scan tool, perform the 2nd Gear Clutch Test. Follow the instructions on the scan tool.

Increase the throttle angle, TPS Degree, to 30° for no more than a few seconds.

CAUTION: Do not overheat the transmission.

NOTE: If the 2C clutch is faulty, the overrunning clutch will hold and the slip test will pass. The 2nd gear
clutch test will not detect a faulty 2C clutch. However, it will detect a faulty UD clutch.

Did the clutch test pass, did the Input Speed remain at zero?

Yes

>> Go To 8

>> Go To 10

CHECK FOR INTERMITTENT OPERATION

Check the Shifter adjustment per the Service Information.

Intermittent gear ratio DTCs can be set by problems in the Input and Output Speed Sensor circuits and/or Speed
Sensor Ground circuit.

Check the Speed Sensor wiring and connectors for good connection, then perform a wiggle test using the Trans-
mission Simulator, Miller tool #8333.

Were 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)

>> Go To 9

CHECK FOR SLIPPAGE

With the scan tool, erase Transmission DTCs.

Road test the vehicle.

Is there an obvious slippage noticed in 2nd gear, or runaway on the 1–2 shift?

Yes

>> Go To 12

>> Go To 15

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