Dodge Ram Truck 1500-2500-3500. Manual — part 1619
P0845-2C HYDRAULIC PRESSURE TEST (CONTINUED)
14.
(T147) 2C PRESSURE SWITCH SENSE CIRCUIT OPEN
Turn the ignition off to the lock position.
Remove the Transmission Simulator, Miller tool #8333.
Disconnect the PCM C4 harness connector and connect Miller tool
#8815.
Measure the resistance of the (T147) 2C Pressure Switch Sense cir-
cuit from the Transmission Solenoid/TRS Assembly harness connector
to the appropriate terminal of Miller tool #8815.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (T147) 2C Pressure Switch Sense circuit for an
open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 15
15.
(T147) 2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (T147) 2C Pressure
Switch Sense circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T147) 2C Pressure Switch Sense circuit for a
short to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 16
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AUTOMATIC TRANSMISSION - 545RFE - ELECTRICAL DIAGNOSTICS
DR/DH
P0845-2C HYDRAULIC PRESSURE TEST (CONTINUED)
16.
(T147) 2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHER CIRCUITS
Disconnect all PCM harness connectors.
Disconnect the Transmission Solenoid/TRS Assembly harness connec-
tor.
NOTE: Make sure the Transmission Solenoid/TRS Assembly har-
ness connector is disconnected.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the (T147) 2C Pressure Switch
Sense circuit and all other circuits in the Transmission Solenoid/TRS
Assembly harness connector.
Is the resistance below 5.0 ohms between the (T147) 2C Pres-
sure Switch Sense circuit and any other circuit(s) in the Trans-
mission Solenoid/TRS Assembly harness connector?
Yes
>> Repair the (T147) 2C Pressure Switch Sense circuit for a
short to other circuit(s).
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion,
damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems
are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
17.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
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.
With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.
If the EATX DTC EVENT DATA shows the DTC P0845 set while the Line Pressure was significantly below the
Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary
oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set
while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure
Sensor and related wiring.
Where there any problems found?
Yes
>> Repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Test Complete.
DR/DH
AUTOMATIC TRANSMISSION - 545RFE - ELECTRICAL DIAGNOSTICS
21 - 409
P0846-2C PRESSURE SWITCH RATIONALITY
21 - 410
AUTOMATIC TRANSMISSION - 545RFE - ELECTRICAL DIAGNOSTICS
DR/DH
P0846-2C 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, engine running, with the transmission in gear.
•
Set Condition:
The DTC is set if the 2C Pressure Switch reads open or closed at the wrong time in a given gear.
Possible Causes
RELATED RELAY DTC’S PRESENT
(T147) 2C PRESSURE SWITCH SENSE CIRCUIT OPEN
(T147) 2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
(T147) 2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHER CIRCUITS
EXCESSIVE FLUID LEAKAGE IN 2C CLUTCH CIRCUIT
NO. 5 AND/OR NO. 7 CHECK BALL CUT OR DAMAGED
EXTRA CHECK BALL DOWNSTREAM OF THE NO. 7 CHECK BALL SOCKET
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
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.
DR/DH
AUTOMATIC TRANSMISSION - 545RFE - ELECTRICAL DIAGNOSTICS
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