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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (2.9L Pcm 2 - DTCS C1260-00 To P0276-00) >> DTC Troubleshooting >> P01C1-00-Fuel Rail Pressure Sensor B Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any 5-Volt Reference DTCs active or pending?

      Yes 

      • Perform the applicable diagnostic procedure(s). Refer to DTC INDEX .

      No 

      • Go To  3
  3. CHECK THE (K162) FUEL RAIL PRESSURE 2 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Fuel Rail Pressure Sensor 2 (FRPS) harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (K162) Fuel Rail Pressure 2 Signal circuit at the FRPS 2 harness connector.

      Is the reading above 5.2 volts?

      Yes 

      • Repair the (K162) Fuel Rail Pressure 2 Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK FOR THE (K162) FUEL RAIL PRESSURE 2 SIGNAL CIRCUIT SHORTED TO THE (K852) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnected PCM-2 C1 harness connector.
    3. Check for continuity between the (K162) Fuel Rail Pressure 2 Signal circuit and the (K852) 5-Volt Supply circuit at the FRPS 2 harness connector.

      Is there continuity between the (K162) Fuel Rail Pressure 2 Signal circuit and the (K852) 5-Volt Supply circuit?

      Yes 

      • Repair the short between the (K162) Fuel Rail Pressure 2 Signal circuit and the (K852) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  5. CHECK THE (K162) FUEL RAIL PRESSURE 2 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Check for continuity of the (K162) Fuel Rail Pressure 2 Signal circuit between the FRPS 2 harness connector and the PCM-2 C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (K162) Fuel Rail Pressure 2 Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (K900) SENSOR GROUND FOR AN OPEN/HIGH RESISTANCE 
    1. Connect the GPEC Adaptor to the PCM C2 harness connector.
    2. Check for continuity of the (K900) Ground circuit between the FRPS 2 harness connector and the PCM-2 C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K900) Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE ABILITY OF THE PCM TO READ THE FUEL RAIL PRESSURE SENSOR 2 SIGNAL 
    1. Turn the ignition off.
    2. Reconnect the PCM-2 C1 harness connectors.
    3. Turn the ignition on.
    4. While monitoring the scan tool, connect a jumper between the (K162) Fuel Rail Pressure 2 Signal circuit and the (K914) Sensor Ground circuit at the FRPS harness connector.
      NOTE:

      The P01C0-FUEL RAIL PRESSURE SENSOR B CIRCUIT LOW DTC should become active or pending with the jumper in place.

      Does the DTC display as described above?

      Yes 

      • Replace the Fuel Rail Pressure Sensor 2 in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM-2 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.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Connect all PCM-2 harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect 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. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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