Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2006
P0845-2/4 HYDRAULIC PRESSURE TEST
For a complete wiring diagram Refer to Section 8W.
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
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•
When Monitored:
In any forward gear with engine speed above 1000 RPM, shortly after a shift and every minute thereafter.
•
Set Condition:
After a shift into a forward gear, with engine speed greater than 1000 RPM, the PCM momentarily turns on
element pressure to the clutch circuits that don’t have pressure to identify the correct pressure switch closes.
If the pressure switch does not close 2 times the DTC sets
Possible Causes
LOSS OF PRIME P0944 PRESENT
(T16) TCM POWER INPUT CIRCUIT OPEN
(T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT OPEN
(T47) 2/4 PRESSURE SWITCH CIRCUIT SHORT TO GROUND
(T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
TRANSMISSION SOLENOID/PRESSURE SWITCH ASSEMBLY
INTERNAL TRANSMISSION
POWERTRAIN CONTROL MODULE
Always perform the 42RLE Pre-Diagnostic Troubleshooting Procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
Theory of Operation
Background: Pressure switches are normally off or open (no pressure applied) and read high (+12 volts). When an
element is applied the corresponding pressure switch closes to ground (0 volts) or turns on. The controller tests the
OD and 24 pressure switches when they are off (ie. when the corresponding friction element is not applied) by
briefly applying the OD and 24 elements which will cause the corresponding pressure switch to close. The test
verifies that the switches are operational and that the switch will close when the corresponding element is applied.
If a switch fails to respond, it is re-tested. The MIL illuminates and the transmission system defaults to Limp-in
mode.
PRESSURE SWITCH STATES
GEAR
L/R
2/4
OD
R
OP
OP
OP
P/N
CL
OP
OP
1st
CL
OP
OP
2nd
OP
CL
OP
D
OP
OP
CL
OD
OP
CL
CL
OP = OPEN
CL = CLOSED
Diagnostic Test
1.
CHECKING FOR LOSS OF PRIME DTC
With the scan tool, check for other Transmission DTCs.
Is the DTC P0944 present also?
Yes
>> Refer to the Transmission category and perform the appropriate diagnostic procedure.
No
>> Go To 2
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
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2.
CHECK FOR RELATED TRANSMISSION DTC’S
With the scan tool, read Transmission DTC’s.
Are any of the DTCs P0732, P0734 and/or P0846 present also?
Yes
>> Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
No
>> Go To 3
3.
CHECK TO SEE IF DTC P0845 IS CURRENT
With the scan tool, Check the STARTS SINCE SET counter for P0845.
NOTE: This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter 2 or less?
Yes
>> Go To 4
No
>> Go To 10
4.
PCM AND WIRING
Turn the ignition off to the lock position.
Remove the Starter Relay.
CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable
the starter.
Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A.
NOTE: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the Transmission Simulator, turn the Pressure Switch selector switch to 2/4.
With the scan tool, monitor the UD Pressure Switch state while pressing the Pressure Switch Test button on the
Transmission Simulator.
Wiggle the wires leading to the PCM while pressing and holding the Pressure Switch Test button.
Did the 2/4 Pressure Switch state change to closed and remain closed while wiggling the wires?
Yes
>> Go To 5
No
>> Go To 6
5.
INTERNAL TRANSMISSION
View repair.
Repair
Disassemble and inspect the Valve Body per the Service Information and repair or replace as neces-
sary. If no problems are found in the Valve Body, replace the Transmission Solenoid/Pressure Switch
Assembly.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
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6.
(T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT OPEN
Turn the ignition off to the lock position.
Disconnect the PCM C4 harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly har-
ness connector.
NOTE: Check connectors - Clean/repair as necessary.
CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.
Measure the resistance of the (T47) 2/4 Pressure Switch Sense circuit
from the appropriate terminal of special tool #8815 to the Transmission
Solenoid/Pressure Switch Assembly harness connector.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (T47) 2/4 Pressure Switch Sense circuit for an
open.
Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1. (Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - 42RLE - STANDARD PROCEDURE)
No
>> Go To 7
7.
(T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
Turn the ignition off to the lock position.
Disconnect the PCM C4 harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly har-
ness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the (T47) 2/4 Pressure
Switch Sense circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T47) 2/4 Pressure Switch Sense circuit for a
short to ground.
Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1. (Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - 42RLE - STANDARD PROCEDURE)
No
>> Go To 8
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