Dodge Dakota (ND). Manual - part 1020

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.

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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

P0732-GEAR RATIO ERROR IN 2ND (CONTINUED)

Diagnostic Test

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.

>> Go To 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

>> Go To 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

>> Go To 7

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.

>> Go To 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

>> Go To 7

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

21 - 473

P0732-GEAR RATIO ERROR IN 2ND (CONTINUED)

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.

>> 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.

CHECK TO SEE IF 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.

>> Go To 9

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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

P0732-GEAR RATIO ERROR IN 2ND (CONTINUED)

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

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 clutch hydraulic
circuit?

Yes

>> Repair as necessary. Check the UD clutch piston seals, reaction shaft support seal rings and the drib-

bler assembly, 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.

>> 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.

>> 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.

If grey sludge is present, check for a improperly assembled 2C clutch with the thick reaction plate not against the
case.

Remove the valve body and air check the 2C hydraulic clutch circuit (in the 2C/4C clutch retainer) per the Service
Information.

NOTE: The 2C clutch passage contains a small bleed orifice, a small amount of air leakage is normal.

Were there any problems found, excessive debris, improperly assembled 2C clutch and/or excessive air
leakage in the 2C hydraulic clutch circuit?

Yes

>> Repair as necessary. Refer to the Service Information for proper repair procedures. Note: Check the 2C

piston seals and bleed orifice.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Go To 13

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

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