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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 ((Powertrain Control Module (Pcm) - Electrical Diagnostics - 40TE Automatic Transmission)) >> DTC Troubleshooting >> P0845-2/4 Hydraulic Pressure Test >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECKING FOR LOSS OF PRIME DTC 
    1. With the scan tool, check for other Transmission DTCs.

      Is the DTC P0944 present also?

      Yes 

      No 

      • Go To  2
  2. CHECK FOR RELATED TRANSMISSION DTCS 
    1. With the scan tool, read Transmission DTCs.

      Are any of the DTCs P0732, P0734 and/or P0846 present also?

      Yes 

      No 

      • Go To  3
  3. CHECK FOR CONTAMINATED FLUID 
    1. Check the transmission fluid for water or other contamination.

      Is the transmission fluid contaminated?

      Yes 

      • Repair the cause of the transmission fluid contamination in accordance with the Service Information. Refer to FLUID, STANDARD PROCEDURE .

      No 

      • Go To  4
  4. CHECK IF THE DTC P0845 IS CURRENT 
    1. With the scan tool, view DTCs.

      Is the status Active or is the Starts Since Set counter 2 or less for this DTC?

      Yes 

      • Go To  5

      No 

      • Go To  10
  5. CHECK THE PCM AND WIRING WITH THE TRANSMISSION SIMULATOR 
    1. Turn the ignition off to the lock position.
    2. Remove the Starter Relay.
      CAUTION:

      Removal of the Starter Relay will prevent the vehicle from being started in gear.

      WARNING:

      The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury.

      NOTE:

      Failure to remove the Starter Relay can cause a Transmission - No Response condition.

    3. Install the (special tool #8333B, Simulator, Transmission) and the Electronic Transmission Adapter kit.
    4. Ignition on, engine not running.
    5. With the Transmission Simulator, turn the Pressure Switch selector switch to 2/4.
    6. With the scan tool, monitor the 2/4 Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator.
    7. Wiggle the wires leading to the PCM while pressing and holding the Pressure Switch Test button.

      Did the 2/4 Pressure Switch state change from open to closed when the test button was pressed, and remain closed while wiggling the wires?

      Yes 

      No 

      • Go To  6
  6. CHECK THE (T47) 2/4 PRESSURE SIGNAL CIRCUIT FOR AN OPEN 
    Fig 1: Checking 2/4 Pressure Signal Circuit For An Open
    GC0149995Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the (special tool #8333B, Simulator, Transmission) and the Electronic Transmission Adapter kit.
    3. Disconnect the PCM C1 harness connector.
    4. Measure the resistance of the (T47) 2/4 Pressure Signal circuit between the PCM C1 harness connector and the Transmission Solenoid/Pressure Switch Assembly harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      No 

      • Go To  7
  7. CHECK THE (T47) 2/4 PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Checking 2/4 Pressure Signal Circuit For A Short To Ground
    GC0149996Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (T47) 2/4 Pressure Signal circuit.

      Is the resistance below 5.0 Ohms?

      Yes 

      No 

      • Go To  8
  8. CHECK THE (T47) 2/4 PRESSURE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 3: Checking 2/4 Pressure Signal Circuit For A Short To Voltage
    GC0149997Courtesy of CHRYSLER GROUP, LLC
    1. Remove the PCM/TCM relay and with a fused jumper wire, jumper the Transmission Control Output to B(+).
    2. Ignition on, engine not running.
    3. Measure the voltage of the (T47) 2/4 Pressure Signal circuit.

      Is the voltage above 0.5 of a volt?

      Yes 

      No 

      • Go To  9
  9. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN 
    Fig 4: Checking Transmission Control Output Circuit For An Open
    GC0149998Courtesy of CHRYSLER GROUP, LLC
    NOTE:

    Fused jumper must still be in place.

    1. Using a 12-volt test light connected to ground, check (T16) Transmission Control 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 

      • 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. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace and program the PCM in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL . With the scan tool, perform Quick Learn.
      • Perform the 40/41TE TRANSMISSION VERIFICATION TEST. Refer to 40/41 TE TRANSMISSION VERIFICATION TEST  .

      No 

      • Repair the Transmission Control Output circuit for an open or high resistance. If the fuse is open make sure to check for a short to ground.
      • Perform the 40/41TE TRANSMISSION VERIFICATION TEST. Refer to 40/41 TE TRANSMISSION VERIFICATION TEST  .
  10. CHECK THE WIRING AND CONNECTORS 
    1. The conditions necessary to set the DTC are not present at this time.
    2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
    3. Wiggle the wires while checking for shorted and open circuits.
    4. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.

      Were there any problems found?

      Yes 

      No 

      • Test Complete.
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