Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

CHECK TO SEE IF DTC P0890 IS PRESENT
1. With the scan tool, view DTCs.
  Is the status Active for this DTC or is the Starts Since Set counter set at 0?
  
  Yes
  - Go to step 2
  No
  - Go to step 5
(T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

Fig 1: CHECKING OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the PCM C4 harness connector.
3. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
4. Ignition on, engine not running.
5. With the scan tool under TIPM, actuate the Transmission.
  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 PCM Pinout Box 8815 to perform diagnosis.
6. Measure the voltage of the (T9) OD Pressure Switch Sense circuit.
  Is the voltage above 0.5 volt?
  
  Yes
  - Repair the (T9) OD Pressure Switch Sense circuit for a short to voltage.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 3
(T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

Fig 2: CHECKING PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
Courtesy of CHRYSLER LLC
1. With the scan tool under TIPM, actuate the Transmission.
2. Measure the voltage of the (T47) 2/4 Pressure Switch Sense circuit.
  Is the voltage above 0.5 volt?
  
  Yes
  - Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to voltage.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 4
(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

Fig 3: CHECKING PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
Courtesy of CHRYSLER LLC
1. With the scan tool under TIPM, actuate the Transmission.
2. Measure the voltage of the (T50) L/R Pressure Switch Sense circuit.
  Is the voltage above 0.5 volts?
  
  Yes
  - Repair the (T50) L/R Pressure Switch Sense circuit for a short to voltage.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  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 and program the PCM in accordance with the Service Information. With the scan tool, perform Quick Learn.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
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 wiring and connectors 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
  - Repair as necessary.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Test Complete.