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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1665 (66RFE Automatic Transmission - DTCS P0218 To P0870 - 2500 Hd) >> DTC Troubleshooting >> P0870-Od Hydraulic Pressure Test >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR RELATED DTCS 
    1. With the scan tool, read TCM DTCs and record on the repair order.

      Are any Loss of Prime, TCM Power Input and or Line Pressure Sensor DTCs set?

      Yes 

      No 

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

      Is DTC P2706 set?

      Yes 

      No 

      • Go To  3
  3. CHECK FOR RELATED DTCS 
    1. With the scan tool, read Transmission DTCs.

      Are DTCs, P0733, P0734, P0735 and or P0871 present?

      Yes 

      • Go To  13

      No 

      • Go To  4
  4. CHECK FOR AN ACTIVE DTC 
    1. Record the Event Data and Environmental Data.
    2. With the scan tool, erase DTCs.
    3. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    4. With the scan tool, read TCM DTCs.

      Did the DTC return?

      Yes 

      • Go To  5

      No 

      • Go To  17
  5. CHECK LINE PRESSURE 
    1. Start the Engine.
    2. Warm the transmission to 82°C (180°F).
    3. Firmly apply the brakes.
    4. With the scan tool, read the Line Pressure during the following step.
    5. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least five seconds in each range.

      Did the line pressure remain at a steady value between 585 and 655 kPa (85 and 95 psi) in each position?

      Yes 

      • Go To  6

      No 

      • Go To  11
  6. CHECK THE LINE PRESSURE SENSOR CONNECTION 
    1. Turn the ignition on.
    2. With the scan tool, read the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the transmission.

      Did the Line Pressure reading on the scan tool change from a higher value to about 207 kPa (30 psi) or 0.7 volts when the connector was pushed inward?

      Yes 

      • Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK THE LINE PRESSURE SENSOR OPERATION 
    1. Turn the ignition off.
    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. Failure to do so can result in possible serious or fatal injury.

      NOTE:

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

    3. Install the Transmission Simulator (special tool #8333B, Simulator, Transmission).
    4. With the Transmission Simulator, select the OFF position on the Input/Output Speed switch.
    5. Turn the ignition on.
    6. With the scan tool, read the Line Pressure while turning the Pressure Switch selector to each of the three line pressure positions on the Transmission Simulator.
      NOTE:

      All three scan tool Line Pressure readings should be steady and ±14 kPa (2.0 psi) or 0.1 volts from the reading specified on the Transmission Simulator.

      Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions?

      Yes 

      No 

      • Go To  8
  8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN 
    1. Turn the ignition off.
    2. Disconnect the Transmission Simulator.
    3. Disconnect the PCM C2 harness connector.
      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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    4. Important:  The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.
    5. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
    6. Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector and the GPEC Diagnostic Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

  9. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (F856) 5-volt Supply circuit at the GPEC Diagnostic Adaptor.

      Is there continuity between ground and the (F856) 5-volt Supply circuit?

      Yes 

      No 

      • Go To  10
  10. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
      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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    2. Important:  The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.
    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
    4. Disconnect all related in-line harness connections (if equipped).
    5. Disconnect the related component harness connectors.
    6. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    7. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    10. With the scan tool, erase DTCs.
    11. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    12. With the scan tool, read PCM DTCs.

      Did the DTC return?

      Yes 

      No 

  11. COMPARE SCAN TOOL TO PRESSURE GAUGE 
    1. Turn the ignition off.
    2. Connect the Line Pressure Adapter (special tool #8259, Adapter, Pressure Test) and 0-300 psi Pressure Gauge (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Refer to 66RFE AUTOMATIC TRANSMISSION - (SERVICE INFORMATION) - 2500 HD for proper installation procedure.
      CAUTION:

      Apply the parking brake.

    3. Start the Engine.
    4. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear.
      CAUTION:

      Do not overheat the transmission.

    5. With the gear selector in PARK, raise the engine speed to 1, 500 rpm and compare line pressure readings.
    6. Firmly apply the brakes, move the gear selector into REVERSE, raise the engine speed to 1, 500 rpm and compare the line pressure readings.
    7. Firmly apply the brakes, move the gear selector into DRIVE, raise the rpm to 1, 500 rpm and compare the line pressure readings.

      Does the scan tool Line Pressure readings match the Pressure Gauge readings ± 10 psi?

      Yes 

      • Go To  12

      No 

  12. CHECK PCM AND WIRING 
    1. Turn the ignition off.
    2. Remove the Line Pressure Adapter (special tool #8259, Adapter, Pressure Test) and 0-300 psi Pressure Gauge (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.).
    3. 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. Failure to do so can result in possible serious or fatal injury.

      NOTE:

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

    4. Install the Transmission Simulator (special tool #8333B, Simulator, Transmission).
    5. On the Transmission Simulator, turn the Pressure Switch selector switch to OD.
    6. Turn the ignition on.
    7. With the scan tool, read the OD Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the OD Pressure Switch.

      Did the OD Pressure Switch state change to closed and remain closed while wiggling the wires?

      Yes 

      • Go To  13

      No 

      • Go To  15
  13. CHECK FOR EXCESSIVE DEBRIS 
    1. Turn the ignition off.
    2. Remove the Transmission Simulator (special tool #8333B, Simulator, Transmission).
    3. Remove and inspect the Transmission Oil Pan in accordance with the Service Information.

      Does the Transmission Oil Pan contain excessive debris or contamination?

      Yes 

      No 

      • Go To  14
  14. CHECK THE OD HYDRAULIC CLUTCH CIRCUIT 
    1. Remove the Valve Body and air check the OD hydraulic clutch circuit (in the case) for leakage in accordance with the Service Information.
      NOTE:

      The OD hydraulic clutch circuit contains a small bleed orifice which connects to the Reverse hydraulic clutch circuit. A small amount of air leakage is normal.

      Was excessive air leakage noticed during the air check?

      Yes 

      • Repair as necessary. Check the OD/Rev clutch piston seals, bleed orifice assembly, reaction shaft support seal rings, and machining of the main mating faces on the pump housing, pump valve body and reaction shaft support.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .

      No 

      • Disassemble and inspect the Valve Body and repair as necessary. Inspect the OD Accumulator piston and seals. Check for an extra check ball downstream from the No. 6 check ball pocket and repair as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  15. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    1. Disconnect all PCM harness connectors.
      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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    2. Important:  The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.
    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
    4. Disconnect the Transmission Solenoid/TRS Assembly harness connector.
    5. Check for continuity between the (T9) OD Pressure Signal circuit and all other circuits at the GPEC Diagnostic Adaptor.

      Is there continuity between the (T9) OD Pressure Signal circuit and any other circuit?

      Yes 

      No 

      • Go To  16
  16. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
      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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    2. Important:  The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.
    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
    4. Disconnect all related in-line harness connections (if equipped).
    5. Disconnect the related component harness connectors.
    6. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    7. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    10. With the scan tool, erase DTCs.
    11. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    12. With the scan tool, read PCM DTCs.

      Did the DTC return?

      Yes 

      No 

  17. CHECK WIRING AND CONNECTORS 
    1. The conditions necessary to set this 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 set.
    5. If the Event Data shows DTC P0870 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring.

      Where any problems found?

      Yes 

      No 

      • Test complete.
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