Dodge Dakota (ND). Manual — part 1059
P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED)
For the Transmission circuit diagram (Refer to )(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:
The DTC is set if the 4C Pressure Switch reads open or closed at the wrong time in a given gear.
Possible Causes
RELATED RELAY DTC’S PRESENT
DTC P0871 ALSO PRESENT
LOSS OF 12-VOLT FEED
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT OPEN
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
EXCESSIVE FLUID LEAKAGE WITH 2C CLUTCH CIRCUIT
#5 AND/OR #7 CHECK BALL CUT OR DAMAGED
LOW LINE PRESSURE
TRANSMISSION SOLENOID/TRS ASSEMBLY
POWERTRAIN CONTROL MODULE
WIRING AND CONNECTORS
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 five pressure switches to monitor the fluid pressure in the LR, 2C, 4C, UD, and OD
clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown.
GEAR
L/R
2C
4C
UD
OD
REVERSE
OPEN
OPEN
OPEN
OPEN
OPEN
P/N
CLOSED
OPEN
OPEN
OPEN
OPEN
1ST
CLOSED*
OPEN
OPEN
CLOSED
OPEN
2ND
OPEN
CLOSED
OPEN
CLOSED
OPEN
2ND PRIME
OPEN
OPEN
CLOSED
CLOSED
OPEN
DRIVE
OPEN
OPEN
OPEN
CLOSED
CLOSED
4TH
OPEN
OPEN
CLOSED
OPEN
CLOSED
5TH
OPEN
CLOSED
OPEN
OPEN
CLOSED
*L/R is closed if output speed is below 100 rpm in Drive and Manual 2. L/R is open in Manual 1.
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
ND
P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED)
Diagnostic Test
1.
DETERMINING IF RELATED RELAY DTC’S ARE PRESENT
With the scan tool, check for other transmission DTC’s.
Are there any Transmission Control Relay related DTC’s present?
Yes
>> Refer to the Transmission category and perform the appropriate symptom.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
EATX DTC DATA SHOW CURRENT DTC
With the scan tool, check the EATX DTC EVENT DATA.
Does the EATX DTC EVENT DATA show data for DTC P0988?
Yes
>> Go To 3
No
>> Refer to the Transmission category and perform the appropriate symptom shown in the EATX DTC
EVENT DATA.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
3.
MULTIPLE DTCS PRESENT
With the scan tool, check for other transmission DTC’s.
Are there two or more related Pressure Switch Sense DTCs present in addition to P0988?
Yes
>> Go To 4
No
>> Go To 7
4.
RELATED DTC PRESENT
With the scan tool, check the EATX DTC EVENT DATA for P0988.
NOTE: Make sure to record all EATX DTC EVENT DATA stored in the scan tool for future reference in this
test procedure.
Do all the pressure switches read CLOSED in the EATX DTC EVENT DATA for P0988?
Yes
>> Refer to Transmission category and perform diagnostics for the DTC P0888.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
EATX DTC EVENT DATA READ OPEN
In the EATX DTC EVENT DATA recorded earlier, read the state of all pressure switches.
Do all the pressure switches read OPEN?
Yes
>> Go To 6
No
>> Go To 7
ND
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
21 - 629
P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED)
6.
LOW LINE PRESSURE
In the EATX DTC EVENT DATA recorded earlier, compare the Line Pressure and the Desired Line Pressure.
Is the Line Pressure less than 40 psi, and significantly below the Desired Line Pressure?
Yes
>> Repair as necessary to correct low line pressure. Check fluid level and adjust as necessary. If fluid level
is OK, check the Primary Oil Filter seal for a split, crack, or improperly installed. If the filter and seal are
OK, check the Main Regulator Valve in the Oil Pump. Refer to the Service Information for the above
procedures.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Replace the Transmission Solenoid/TRS Assembly per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
7.
DTC P0871 ALSO PRESENT
With the scan tool, check Transmission DTCs.
Is the DTC P0871 also present?
Yes
>> Refer to the Transmission category and perform the appropriate symptom.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 8
8.
EATX DTC EVENT DATA READ PARK REVERSE OR NEUTRAL
With the scan tool, check the EATX DTC EVENT DATA for P0988.
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 show the DTC set in Park, Neutral, or Reverse for P0988?
Yes
>> Go To 13
No
>> Go To 9
9.
EATX DTC EVENT DATA READ CLOSED
With the scan tool, check the EATX DTC EVENT DATA for P0988.
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 show the 4C Pressure Switch reading CLOSED?
Yes
>> Go To 11
No
>> Go To 10
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
ND
P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED)
10.
PRIMARY OIL FILTER SEAL
In the EATX DTC EVENT DATA recorded earlier, compare the Line Pressure and the Desired Line Pressure.
Is the Line Pressure less than 40 psi, and significantly below the Desired Line Pressure?
Yes
>> Repair as necessary to correct low line pressure. Check fluid level and adjust as necessary. If fluid level
is OK, check the Primary Oil Filter seal for a split, crack, or improperly installed. If the filter and seal are
OK, check the Main Regulator Valve in the Oil Pump. Refer to the Service Information for the above
procedures.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 15
11.
PCM AND WIRING
Turn the ignition off to the lock position.
Remove the Starter Relay.
NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the
starter.
Install the Transmission Simulator, Miller tool #8333.
NOTE: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the Transmission Simulator, turn the Pressure Switch selector switch to the 4C position.
With the scan tool, monitor the 4C Pressure Switch while pressing the Pressure Switch test button on the Trans-
mission Simulator.
Did the state of the 4C Pressure Switch change while pressing the Pressure Switch Test button?
Yes
>> Go To 12
No
>> Go To 13
12.
TRANSMISSION SOLENOID/TRS ASSEMBLY
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.
Where there any problems found?
Yes
>> Repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Replace the Transmission Solenoid/TRS Assembly per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
ND
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
21 - 631
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