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Home >> Dodge and Ram >> 2009 >> Durango Hybrid >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Transmission Electronic Hydraulic Control Module (TEHCM) - Electrical Diagnostics >> DTC Troubleshooting >> P077B-Output Speed Sensor Circuit - Direction Error >> Diagnostic Test

Diagnostic Test

  1. CHECK IF THE DTC RESETS 
    WARNING: On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury. Refer to Electrical/Battery System - Warning
    1. With the scan tool, read and record the Environmental Data for all DTCs.
    2. Erase the DTC and using the Environmental Data recorded earlier, test drive the vehicle while trying to duplicate the conditions in which the DTC originally set.

      Does the DTC reset?

      Yes 

      • Go to step  2

      No 

      • Go to step  10
  2. CHECK THE (T378) OUTPUT SPEED SENSOR SUPPLY CIRCUIT 
    Fig 1: Checking Output Speed Sensor Circuit
    GC0106961Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the Output Speed Sensor harness connector.
    3. Turn the ignition on to the run position.
    4. Measure the voltage of the (T378) Output Speed Sensor Supply circuit.

      Is the voltage between 6.0 to 12.0 volts?

      Yes 

      • Go to step  5

      No 

      • Go to step  3
  3. CHECK THE (T378) OUTPUT SPEED SENSOR SUPPLY CIRCUIT FOR AN OPEN 
    Fig 2: Checking Output Speed Sensor Circuit
    GC0106962Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the Transmission C2 harness connector and connect the 24 Pin Jumper harness 10155 to the Transmission C2 connector of the transmission.
      CAUTION: When performing circuit testing, use the appropriate test leads from the Dedicated Test Leads 10159. Probing the vehicle harness connectors or the jumper harness connectors will damage the terminals resulting in poor terminal to pin connection.
    3. Turn the ignition on to the run position.
    4. Measure the voltage of the (T378) Output Speed Sensor Supply circuit.

      Is the voltage between 6.0 to 12.0 volts?

      Yes 

      No 

      • Go to step  4
  4. CHECK THE (T378) OUTPUT SPEED SENSOR SUPPLY CIRCUIT AT THE TEHCM 
    Fig 3: Checking Output Speed Sensor Circuit
    GC0106963Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Remove the transmission oil pan and disconnect the Output Speed Sensor internal connector to the TCM.
      CAUTION: When performing circuit testing, use the appropriate test leads from the Dedicated Test Leads 10159. Probing the vehicle harness connectors or the jumper harness connectors will damage the terminals resulting in poor terminal to pin connection.
    3. Turn the ignition on to the run position.
    4. Measure the voltage of the (T378) Output Speed Sensor Supply circuit.

      Is the voltage between 6.0 to 12.0 volts?

      Yes 

      No 

      • Using the schematics as a guide, check the Transmission Electro Hydraulic Control Module (TEHCM) connectors and terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Refer to any Technical Service Bulletins and Service Information Updates for possible causes that may apply. Verify that the TCM is equipped with the latest software and is properly programmed. If no problems are found, replace and program the TEHCM in accordance with the Service Information. Using the scan tool, perform the Resolver Offset Learn Trigger procedure.
      • Perform 2-MODE HYBRID TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Electronic Hydraulic Control (TEHCM) - Standard Procedure .
  5. CHECK THE (T14) OUTPUT SPEED SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 4: Checking Output Speed Sensor Circuit
    GC0106964Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the Transmission C2 harness connector.
    3. Measure the resistance between ground and the (T14) Output Speed Signal circuit.

      Is the resistance below 100k Ohms?

      Yes 

      No 

      • Go to step  6
  6. CHECK THE (T14) OUTPUT SPEED SIGNAL CIRCUIT FOR AN OPEN 
    Fig 5: Checking Output Speed Sensor Circuit
    GC0106965Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (T14) Output Speed Signal circuit between the Output Speed Sensor harness connector and the Transmission C2 harness connector.

      Is the resistance below 1.0 Ohm?

      Yes 

      • Go to step  7

      No 

  7. CHECK THE (T14) OUTPUT SPEED SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 6: Checking Output Speed Sensor Circuit
    GC0106966Courtesy of CHRYSLER LLC
    1. Turn the ignition on to the run position.
    2. Measure the voltage of the (T14) Output Speed Signal circuit.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  8
  8. CHECK THE OUTPUT SPEED SENSOR 
    1. Remove the Output Speed Sensor.
    2. Inspect the Output Speed Sensor tone wheel (K2 clutch shell) for burrs or improperly machined.
    3. If no problems are found, replace the Output Speed Sensor in accordance with the Service Information.
    4. Perform 2-MODE HYBRID TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Electronic Hydraulic Control (TEHCM) - Standard Procedure .

      Did the DTC reset during the road test?

      Yes 

      • Go to step  9

      No 

      • Test complete.
  9. CHECK THE TRANSMISSION C2 INTERNAL WIRING HARNESS 
    1. Remove the transmission oil pan in accordance with the Service Information.
    2. Check the Transmission internal C2 pigtail wiring harness terminals and connectors to the TEHCM for corrosion, damage, or terminal push out. Check the wiring for chafing, open, or a short to ground.

      Were there any problems found with the Transmission internal C2 pigtail wiring harness?

      Yes 

      No 

      • Using the schematics as a guide, check the Transmission Electro Hydraulic Control Module (TEHCM) connectors and terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Refer to any Technical Service Bulletins and Service Information Updates for possible causes that may apply. Verify that the TCM is equipped with the latest software and is properly programmed. If no problems are found, replace and program the TEHCM in accordance with the Service Information. Using the scan tool, perform the Resolver Offset Learn Trigger procedure.
      • Perform 2-MODE HYBRID TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Electronic Hydraulic Control (TEHCM) - Standard Procedure .
  10. CHECK THE WIRING AND CONNECTORS 
    1. The conditions necessary to set this DTC are not present at this time.
    2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
    3. Check Service Information Tune-ups or Service Bulletins for any possible causes that may apply.
    4. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
    5. Wiggle the wires while checking for shorted and open circuits.

      Were there any problems found?

      Yes 

      No 

      • Test complete.
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