Dodge Dakota (ND). Manual — part 1042
P0871-OD PRESSURE SWITCH RATIONALITY
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0871-OD PRESSURE SWITCH RATIONALITY (CONTINUED)
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 and engine running.
•
Set Condition:
The appropriate DTC is set if one of the pressure switches are open or closed at the wrong time in a given
gear.
Possible Causes
RELATED RELAY DTC’S PRESENT
LINE PRESSURE DTCS PRESENT
NO. 4 OR 6 CHECK BALL CUT OR DAMAGED
(T9) OD PRESSURE SWITCH SENSE CIRCUIT OPEN
(T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
(T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO ANOTHER CIRCUIT
LOW LINE PRESSURE
WIRING AND CONNECTORS
CUT OD/REV PISTON SEAL
BROKEN OR MISSING DO/REV PISTON BLEED ORIFICE
BROKEN REACTION SHAFT SUPPORT SEAL RING
POOR MACHINING ON PUMP VALVE BODY FACE
BROKEN OR MISSING DRIBBLER ORIFICE ASSEMBLY IN REACTION SHAFT SUPPORT
TRANSMISSION SOLENOID/TRS ASSEMBLY
CUT OD ACCUMULATOR PISTON SEAL
CRACKED OD ACCUMULATOR PISTON
BROKEN OR MISSING OD BLEED ORIFICE IN MAIN VALVE BODY
POWERTRAIN CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - DIAGNOSIS AND TESTING).
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P0871-OD PRESSURE SWITCH RATIONALITY (CONTINUED)
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
3RD
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 closed in Manual 1.
**May be open when rolling in Neutral or at low oil temperatures.
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.
LINE PRESSURE DTCS PRESENT
With the scan tool, read Transmission DTCs.
Are there any Line Pressure DTCs present?
Yes
>> Refer to the Transmission category and perform the appropriate symptom.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
CHECK FOR OTHER PRESSURE SWITCH DTCS
With the scan tool, check Transmission DTCs.
Are there two or more other pressure switch rationality DTCs present in addition to P0871?
Yes
>> Go To 5
No
>> Go To 4
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0871-OD PRESSURE SWITCH RATIONALITY (CONTINUED)
4.
CHECK IF DTC IS CURRENT
With the scan tool, check 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 show data for P0871
Yes
>> Go To 8
No
>> Refer to the Transmission Category and perform the appropriate symptom.
5.
RELATED DTC PRESENT
With the scan tool, check 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.
Do all the pressure switches read CLOSED in the EATX DTC EVENT DATA?
Yes
>> Refer to the Transmission category and perform diagnostics for P0888. Follow instructions as if the DTC
is current.
No
>> Go To 6
6.
CHECK IF PRESSURE SWITCHES 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 7
No
>> Go To 8
7.
CHECK FOR LOW LINE PRESSURE
In the EATX DTC EVENT DATA recorded earlier, compare the Line Pressure to 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 weal for a spit, crack , or improperly installed. If the filer 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.
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