Dodge Durango (HB). Manual — part 1249
P0731-GEAR RATIO ERROR IN 1ST (CONTINUED)
Diagnostic Test
1.
DETERMINING IF RELATED DTC’S ARE PRESENT
With the scan tool, check for other transmission DTC’s
If any of these DTC’s are present, perform their respective tests first.
Are there any Transmission; solenoid, line pressure, speed sensor, and/or loss of prime DTC’s 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.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
CHECK TO SEE 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
No
>> Go To 4
3.
CHECK FOR INTERMITTENT OPERATION
The conditions to set this DTC are not currently present.
With the scan tool, check the EATX 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, misinstalled or damaged primary filter or filter seal, sticking main reg-
ulator 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.
NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition.
Install Transmission Simulator, Miller tool #8333.
Wiggle wiring and connectors while checking for intermittent operation with the Transmission Simulator.
Gear ratio DTC’s 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.
No
>> Test Complete.
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0731-GEAR RATIO ERROR IN 1ST (CONTINUED)
4.
INTERNAL TRANSMISSION
Repair internal transmission as necessary. Refer to the Service Information.
If there were any line pressure DTC’s 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 DTC’s P0876 and/or P0875 were present in addition to the P0731, replace the Transmission Solenoid/TRS
Assembly in addition to necessary internal repairs.
Pay particular attention to the following list of possible causes when repairing the transmission condition.
- Cut UD piston seal
- 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
- Transmission Solenoid/TRS Assembly
View repair.
Repair
Repair internal transmission per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0732-GEAR RATIO ERROR IN 2ND
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE -
SCHEMATICS AND DIAGRAMS)
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 MISINSTALLED 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 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - DIAGNOSIS AND TESTING).
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.
HB
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0732-GEAR RATIO ERROR IN 2ND (CONTINUED)
Diagnostic Test
1.
DETERMINING IF RELATED DTC’S ARE PRESENT
With the scan tool, check for other transmission DTC’s
Are there any Transmission; solenoid, line pressure, speed sensor, and/or loss of prime DTC’s present?
Yes
>> Refer to appropriate symptom in the Transmission category. Perform the test for P0944–LOSS OF
PRIME first if it is present.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
CHECK IF DTC IS CURRENT
With the scan tool, read and record the EATX DTC EVENT DATA.
NOTE: Make sure to record all EATX DTC EVENT DATA stored in the scan tool for future reference in this
test procedure.
Does the EATX DTC EVENT DATA display information for the DTC P0732?
Yes
>> Go To 4
No
>> Go To 3
3.
CHECK EATX DTC EVENT DATA
In the EATX DTC EVENT DATA, identify the DTC that was recorded earlier.
Does the EATX 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
No
>> Go To 7
4.
CHECK RPM IN EATX DTC EVENT DATA
Refer to the EATX 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.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
CHECK LINE PRESSURE READING
Refer to the EATX DTC EVENT DATA recorded earlier.
Is the line pressure reading more than 10 psi below the desired line pressure?
Yes
>> Go To 6
No
>> Go To 7
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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