LEMON Manuals: Even more car manuals for everyone
Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (42RLE Automatic Transmission - Electrical Diagnostics) >> Electrical Diagnostics >> DTC Troubleshooting >> P0845-2/4 Hydraulic Pressure Test >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  CHECKING FOR LOSS OF PRIME DTC 

    With the scan tool, check for other Transmission DTCs.

    Is the DTC P0944 present also? 

    Yes 

    1. Perform appropriate DTC test(s) in this article.

    No 

    1. Go To step  2).
  2. 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 

    1. Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information.
    2. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1  

    No 

    1. Go To step  3).
  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 

    1. Go To step  4).

    No 

    1. Go To step  10).
  4. 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 

    1. Go To step  5).

    No 

    1. Go To step  6).
  5. 5)  INTERNAL TRANSMISSION  

    View repair. 

    Repair 

    1. Disassemble and inspect the Valve Body per the Service Information and repair or replace as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/Pressure Switch Assembly.
    2. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1  
  6. 6)  (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT OPEN 
    Fig 1: Checking 2/4 Pressure Switch Sense Circuit For Open
    GC0012643Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off to the lock position.

    Disconnect the PCM C4 harness connector.

    Disconnect the Transmission Solenoid/Pressure Switch Assembly harness 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 

    1. Repair the (T47) 2/4 Pressure Switch Sense circuit for an open.
    2. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1  

    No 

    1. Go To step  7).
  7. 7)  (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND 
    Fig 2: Checking 2/4 Pressure Switch Sense Circuit For Short To Ground
    GC0012644Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off to the lock position.

    Disconnect the PCM C4 harness connector.

    Disconnect the Transmission Solenoid/Pressure Switch Assembly harness 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 

    1. Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to ground.
    2. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1  

    No 

    1. Go To step  8).
  8. 8)  (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE 
    Fig 3: Checking 2/4 Pressure Switch Sense Circuit For Short To Voltage
    GC0012645Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off to the lock position.

    Disconnect the PCM C4 harness connector.

    Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.

    Remove the Transmission Control Relay.

    NOTE: Check connectors - Clean/repair as necessary.

    Connect a jumper wire between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit.

    Ignition on, engine not running.

    Measure the voltage of the (T47) 2/4 Pressure Switch Sense circuit.

    Is the voltage above 0.5 volts? 

    Yes 

    1. Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to voltage.
    2. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1  

    No 

    1. Go To step  9).
  9. 9)  TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN 
    Fig 4: Checking Transmission Control Relay Output Circuit For Open
    GC0012646Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off to the lock position.

    Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.

    Remove the Transmission Control Relay.

    NOTE: Check connectors - Clean/repair as necessary.

    Connect a jumper wire between the (Internal) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector.

    Ignition on, engine not running.

    Using a 12-volt test light connected to ground, check (T16) Transmission Control Relay Output circuit in the Transmission Solenoid/Pressure Switch Assembly harness connector.

    NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

    Does the test light illuminate brightly? 

    Yes 

    1. 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, then program Pinion Factor in the Front Control Module. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)
    2. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1  

    No 

    1. Repair the Transmission Control Relay Output circuit for an open or high resistance. If the fuse is open make sure to check for a short to ground.
    2. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1  
  10. 10)  INTERMITTENT WIRING AND CONNECTORS 

    The conditions necessary to set the 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.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1  

    No 

    1. Test Complete.
scientia non olet · About LEMON Manuals