Dodge Durango (HB). Manual — part 1251
P0733-GEAR RATIO ERROR IN 3RD
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
BENT OR BROKEN ACCUMULATOR COVER ON MAIN VALVE BODY
WORN SOLENOID SWITCH VALVE OR PLUGS
STUCK OR STICKING MAIN REGULATOR VALVE
BURNED UD OR OD CLUTCH
CUT OD OR UD PISTON SEAL
BROKEN OR MISSING UD OR OD BLEED ORIFICE IN MAIN VALVE BODY
BROKEN OR MISSING BLEED ORIFICE IN UD OR OD CLUTCH PISTON
CUT OD OR UD ACCUMULATOR PISTON SEAL
CRACKED OD OR UD ACCUMULATOR PISTON
CUT OR MISSING #6 CHECK BALL
TRANSMISSION SOLENOID/TRS ASSEMBLY
BROKEN WELD - REVERSE CARRIER HUB TO CARRIER
BROKEN REACTION SHAFT SUPPORT SEAL RING
POOR MACHINING ON PUMP VALVE BODY FACE
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.
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0733-GEAR RATIO ERROR IN 3RD (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 EATX DTC EVENT DATA
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 P0733?
Yes
>> Go To 4
No
>> Go To 3
3.
TARGET GEAR IN 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 = 3rd, or with
both OD 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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P0733-GEAR RATIO ERROR IN 3RD (CONTINUED)
6.
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 misin-
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.
No
>> 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.
7.
CHECK TO SEE IF DTC P0733 IS CURRENT
With the scan tool, perform the 3rd 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 OD clutch is faulty, the overrunning clutch will hold and the slip test will pass. The 3rd gear
clutch test will not detect a faulty OD 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
No
>> Go To 10
8.
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.
No
>> Go To 9
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0733-GEAR RATIO ERROR IN 3RD (CONTINUED)
9.
CHECK FOR SLIPPAGE
With the scan tool, erase Transmission DTCs.
Road test the vehicle. Check operation in 3rd gear, 4th gear, and Reverse.
Is there an obvious slippage noticed in 3rd gear, or runaway on the 2–3 shift?
Yes
>> Go To 12
No
>> Go To 16
10.
UD HYDRAULIC CLUTCH CIRCUIT
Remove Transmission Oil Pan and check for excessive debris.
Remove the Valve Body and air check the UD hydraulic clutch circuit (in the case) per the Service Information.
NOTE: The UD clutch passage contains a small bleed orifice, a small amount of air leakage is normal.
Were there any problems found, excessive debris and/or excessive air leakage in the UD hydraulic clutch
circuit?
Yes
>> Repair as necessary. Check the UD clutch piston seals, reaction shaft support seal rings and dribbler
assemblies, and the flatness of the pump valve body and pump housing faces. Check main regulator
valve for sticking in the bore.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 11
11.
UD ACCUMULATOR PISTON
Check the UD bleed orifice, accumulator piston, and accumulator piston seal in the main valve body.
Were there any problems found?
Yes
>> Repair as necessary. Refer to the Service Information for proper repair procedures.
No
>> Replace the Transmission Solenoid/TRS Assembly per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
12.
EXCESSIVE DEBRIS
Remove the Transmission Oil Pan and check for excessive debris.
Remove the valve body and check if the accumulator cover is intact.
Air check the OD hydraulic clutch circuit (in the case) per the Service Information.
NOTE: The OD clutch passage contains a small bleed orifice which connects to the Reverse clutch hydrau-
lic circuit, a small amount of air leakage into the Reverse clutch passage is normal.
Were there any problems found, excessive debris, and/or excessive air leakage in the OD hydraulic clutch
circuit?
Yes
>> Repair as necessary. Refer to the Service Information for proper repair procedures. Note: Check the
bleed orifice in the OD/Reverse clutch piston.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 13
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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