Jeep Liberty KJ. Manual - part 1133

CHECK THE (K244) ENGINE RPM SIGNAL CIRCUIT FOR AN OPEN

Turn the ignition off to the lock position.

Disconnect the TCM harness connector.

Disconnect the ECM harness connector.

Measure the resistance of the (K244) Engine RPM Signal circuit between the TCM harness connector and the ECM
harness connector.

Is the resistance above 5.0 ohms?

Yes

>> Repair the (K244) Engine RPM Signal circuit for an open

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

>> Go To 4

CHECK THE (K244) ENGINE RPM SIGNAL CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between ground and the (K244) Engine RPM Signal circuit.

Is the resistance below 5.0 ohms?

Yes

>> Repair the (K244) Engine RPM Signal circuit for a short to ground.

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

>> Go To 5

CHECK THE (K244) ENGINE RPM SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition on, engine not running.

Check the voltage of the (K244) Engine RPM Signal circuit.

Is the voltage above 0.5 volts?

Yes

>> Repair the (K244) Engine RPM Signal circuit for a short to voltage.

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

>> Go To 6

CHECK THE TCM

Turn the ignition off to the lock position.

Replace and program the TCM per the Service Information.

Start the engine and allow the engine to idle for 6 minutes.

Check the voltage of the (K244) Engine RPM Signal circuit.

Does the DTC reset?

Yes

>> Replace the ECM per the Service Information.

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

>> Test Complete.

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)

CHECK 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.

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)

>> Test Complete.

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)

21 - 477

P0731-GEAR RATIO ERROR IN 1ST

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

CUT UD PISTON SEAL

LOW FLUID LEVEL

CRACKED OR MIS-INSTALLED PRIMARY OIL FILTER OR SEAL

STUCK OR STICKING MAIN REGULATOR VALVE

FAILED OVERRUNNING CLUTCH

CUT UD ACCUMULATOR SEAL RING

BROKEN UD ACCUMULATOR PISTON

BROKEN REACTION SHAFT SUPPORT SEAL RING

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

INPUT SPEED SENSOR AND RELATED WIRING

TRANSMISSION SOLENOID/TRS ASSEMBLY

TRANSMISSION CONTROL MODULE

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.

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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)

Diagnostic Test

CHECK FOR RELATED DTCS

With the scan tool, check for other transmission DTCs.

If any of these DTCs are present, perform their respective tests first.

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

Yes

>> Refer to the Transmission category and perform the appropriate symptom. If any of these DTCs are

present, they may cause a Speed Ratio Error. Perform the test for P0944 first if it is present.

>> Go To 2

CHECK IF DTC P0731 IS CURRENT

With the scan tool, perform the 1st Gear Clutch Test. Follow the instructions on the scan tool.

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

CAUTION: Do not overheat the transmission.

Did the Clutch Test pass, Input Speed remain at zero?

Yes

>> Go To 3

>> Go To 4

CHECK FOR INTERMITTENT OPERATION

The conditions to set this DTC are not currently present.

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 fault P0731 was set in Park, Reverse, or Neutral, replace the Powertrain Control
Module.

•

If the DTC Event Data shows fault P0731 set with input RPM = zero, check the input speed sensor and related
wiring.

•

If the DTC Event Data shows fault P0731 set with line pressure significantly below desired line pressure, check
for the cause of low line pressure (i.e., oil level, mis-installed or damaged primary filter or filter seal, sticking
main regulator valve in pump, etc.).

•

If the DTC Event Data shows fault P0731 set with the UD pressure switch open (but line pressure matches
Desired Line Pressure), air check the UD hydraulic clutch circuit for leakage per the Service Information. If the
UD hydraulic clutch circuit is OK, replace the solenoid/TRS assembly.

Check the gearshift linkage adjustment.

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

Remove the Starter Relay.

CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear.

WARNING: The Starter Relay must be removed from the PDC. Failure to do so can result in personal injury
or death.

NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition.
Install the Transmission Simulator, Miller tool #8333.

Wiggle wiring and connectors while checking for intermittent operation with the Transmission Simulator.

Gear ratio DTCs can also be set under extreme temperature conditions.

Verify if the problem is only experienced under extreme hot or cold conditions.

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)

>> Test Complete.

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL)

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