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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1571 (6.7L Diesel - DTCS P0008 To P0401 - 2500 Hd) >> DTC Troubleshooting >> P0193-Fuel Pressure Sensor High >> 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. ACTIVE DTC 
    NOTE:

    If there are any 5-Volt supply DTCs present, repair those DTCs before proceeding.

    1. Turn the ignition on.
    2. With the scan tool, record all Freeze frame data.
    3. With the scan tool, erase DTCs.
    4. Turn the ignition off for 75 seconds.
    5. Turn the ignition on.
    6. With the scan tool, read DTCs.

      Did the DTC reset?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (K181) FRP SENSOR SIGNAL 1 CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Fuel Rail Pressure Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (K181) FRP Sensor Signal 1 circuit at the FRP Sensor harness connector.

      Is the reading above 5.2 volts?

      Yes 

      • Repair the (K181) Fuel Rail Pressure Sensor Signal 1 circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK FOR THE (K181) FRP SENSOR SIGNAL 1 CIRCUIT SHORTED TO THE (K350) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnected PCM C1 harness connector.
    3. Measure the resistance between the (K181) FRP Sensor Signal 1 circuit and the (K350) 5-Volt Supply circuit at the FRP Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short between the (K181) Fuel Rail Pressure Sensor Signal 1 circuit and the (K350) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K181) FRP SENSOR SIGNAL 1 CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K181) FRP Sensor Signal 1 circuit between the FRP Sensor harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K181) Fuel Rail Pressure Sensor Signal 1 circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (K179) FRP SENSOR 2 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Fuel Rail Pressure Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (K179) FRP Sensor 2 Signal circuit at the FRP Sensor harness connector.

      Is the reading above 5.2 volts?

      Yes 

      • Repair the (K179) Fuel Rail Pressure Sensor Signal 2 circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK FOR THE (K179) FRP SENSOR SIGNAL 2 CIRCUIT SHORTED TO THE (K350) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnected PCM C1 harness connector.
    3. Measure the resistance between the (K179) FRP Sensor Signal 2 circuit and the (K350) 5-Volt Supply circuit at the FRP Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short between the (K179) Fuel Rail Pressure Sensor 2 Signal circuit and the (K350) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK THE (K179) FRP SENSOR SIGNAL 2 CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K179) FRP Sensor Signal 2 circuit between the FRP Sensor harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (K1791) Fuel Rail Pressure Sensor Signal 2 circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. CHECK THE (K180) SENSOR RETURN FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K180) Sensor Return circuit between the FRP Sensor harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (K180) Sensor Return circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. CHECK THE FUEL RAIL PRESSURE SENSOR 
    1. Turn the ignition off.
    2. Reconnect the PCM C1 harness connector.
    3. Reconnect the FRP Sensor harness connector.
    4. Turn the ignition on.
    5. With the scan tool, erase DTCs.
    6. While monitoring scan tool, connect a jumper between the (K181) FRP Sensor Signal 1 circuit and the (K180) Sensor Return circuit at the FRP Sensor harness connector.

      Does the DTC P0192 set?

      Yes 

      • Replace the Fuel Rail Pressure Sensor in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10
  10. POWERTRAIN CONTROL MODULE 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. 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.

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

      Did the DTC return?

      Yes 

      No 

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