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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (1.4L 16-Valve Turbo - DTCS P1041-00 To P2101-00 - 500) >> DTC Troubleshooting >> P1185-00-General Pressure Sensor Correlation >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Diagnose and repair any Boost Pressure or MAP Sensor DTCs before proceeding with this test.

    NOTE:

    Diagnose and repair any system voltage DTCs before continuing with this test.

    1. Start the engine and allow it to reach normal operating temperature.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    2. With the scan tool, read DTCs.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECKING THE MAP SENSOR 
    1. Perform the diagnostic procedure for CHECKING THE MAP SENSOR OPERATION. Refer to CHECKING THE MAP SENSOR OPERATION .

      Were any problems found?

      Yes 

      No 

      • Go To  3
  3. CHECKING THE BAROMETRIC PRESSURE SENSOR 
    NOTE:

    The Barometric Pressure Sensor is internal to the PCM.

    NOTE:

    The Barometric Pressure should be approximately equal to the actual barometric pressure. If necessary, compare the Barometric Pressure value of the tested vehicle to the value of a known good vehicle of a similar make and model.

    1. Compare the Barometric Pressure of the tested vehicle to the value of a known good vehicle of a similar make and model.

      Is the Barometric Pressure value of the tested vehicle equal to the value of the know good vehicle (plus or minus 2%)?

      Yes 

      • Go To  4

      No 

      • Go To  17
  4. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Boost Pressure Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage between ground and the (F856) 5-Volt Supply circuit at the Boost Pressure Sensor harness connector.
      NOTE:

      The voltage should be 5.0 volts (plus or minus 0.1 of a volt).

      Is the voltage displayed as described above?

      Yes 

      • Go To  5

      No 

      • Go To  12
  5. CHECK FOR THE (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K37) BOOST PRESSURE SIGNAL CIRCUIT 
    1. Disconnect the Powertrain Control Module (PCM) harness connectors.
    2. Check for continuity between the (F856) 5-Volt Supply circuit and the (K37) Boost Pressure Signal circuit at the Boost Pressure Sensor harness connector.

      Is there continuity between (F856) 5-Volt Supply circuit and the (K37) Boost Pressure Signal circuit?

      Yes 

      No 

      • Go To  6
  6. CHECK THE (K37) BOOST PRESSURE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition on.
    2. Measure the voltage between ground and the (K37) Boost Pressure Signal circuit at the Boost Pressure Sensor harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go To  7
  7. Check The (K37) BOOST PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Check for continuity between ground and the (K37) Boost Pressure Signal circuit at the Boost Pressure Sensor harness connector.

      Is there continuity between ground and the (K37) Boost Pressure Signal circuit?

      Yes 

      No 

      • Go To  8
  8. CHECK FOR THE (K37) BOOST PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    1. Check for continuity between the (K37) Boost Pressure Signal circuit and the (K900) Sensor Ground circuit at the Boost Pressure Sensor harness connector.

      Is there continuity between the (K37) Boost Pressure Signal circuit and the (K900) Sensor Ground circuit?

      Yes 

      No 

      • Go To  9
  9. CHECK THE (K37) BOOST PRESSURE SIGNAL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    NOTE:

    When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

    1. Measure the resistance of the (K37) Boost Pressure Signal circuit between the Boost Pressure Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  10

      No 

  10. CHECK THE (K900) SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    NOTE:

    When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

    1. Measure the resistance of the (K900) Sensor Ground circuit between the Boost Pressure Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  11

      No 

  11. CHECK THE BOOST PRESSURE SENSOR SIGNAL VOLTAGE 
    1. Turn the ignition off.
    2. Connect the Powertrain Control Module (PCM) harness connectors.
    3. Connect a jumper wire between the (K900) Sensor Ground circuit and the (K37) Boost Pressure Signal circuit at the Boost Pressure Sensor harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read the Boost Pressure Sensor signal voltage.
      NOTE:

      The voltage should be 0.0 volts (plus or minus 0.1 of a volt) with the jumper wire in place.

      Is the voltage on the scan tool displayed as described above?

      Yes 

      • Go To  12

      No 

      • Go To  17
  12. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage between ground and the (F856) 5-Volt Supply circuit at the Boost Pressure Sensor harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go To  13
  13. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Check for continuity between ground and the (F856) 5-Volt Supply circuit at the Boost Pressure Sensor harness connector.

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

      Yes 

      No 

      • Go To  14
  14. CHECK FOR THE (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    1. Check for continuity between the (F856) 5-Volt Supply circuit and the (K900) Sensor Ground circuit at the Boost Pressure Sensor harness connector.

      Is there continuity between the (K900) Sensor Ground circuit and the (F856) 5-Volt Supply circuit?

      Yes 

      No 

      • Go To  15
  15. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    NOTE:

    When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

    1. Measure the resistance of the (F856) 5-Volt Supply circuit between the Boost Pressure Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  16

      No 

  16. BOOST PRESSURE SENSOR 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure Sensor and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.
    4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
    5. Look for the data to change or for the DTC to reset during the wiggle test.
    6. Perform any Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

  17. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor and the Powertrain Control Module (PCM) and between the Boost Pressure Sensor and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
    5. Look for the data to change or for the DTC to reset during the wiggle test.
    6. Perform any Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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