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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1650 (Engine Controls - Pinpoint Tests - (Hybrid) - Fault Code Index, Pinpoint Tests A - DN) >> Pinpoint Test DD: Fuel Rail Pressure Temperature (FRPT) Sensor >> Test Procedure

Test Procedure

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. DD1 DTCS P0182, P0183, P0190, P0191, P0192 AND P0193: CHECK FOR SELF-TEST DTCS 

    Are any of the following DTCs present during the PCM self-test: P0182, P0183, P0190, P0191, P0192 or P0193? 

    Yes No
    For KOEO and KOER DTCs P0182 and P0183, GO to  DD16.
    For continuous memory DTCs P0182 and P0183, GO to  DD23.
    For continuous memory DTC P0190, GO to  DD2.
    For DTC P0191, GO to  DD11.
    For KOEO and KOER DTCs P0192 and P0193, GO to  DD2.
    For continuous memory DTCs P0192 and P0193, GO to  DD10.    		 Unable to duplicate or identify the fault at this time.
    The concern is elsewhere. RETURN to SYMPTOM CHARTS for further direction.
  2. DD2 CONTINUOUS MEMORY DTC P0190, KOEO AND KOER DTCS P0192 AND P0193: CHECK THE FRPT SENSOR FOR FUEL LEAKS 
    NOTE: Repair any fuel pump DTCs prior to this test.
    • Start the engine using the engine running diagnostic mode. Refer to DIAGNOSTIC MODES .
    • Idle the engine for 2 minutes.
    • Key in OFF position.
    • Remove FRPT sensor vacuum hose.
    • Inspect the FRPT sensor and vacuum hose for traces of fuel.

    Is fuel present? 

    Yes No
    Key in OFF position. INSTALL a new FRPT sensor.
    REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.
    GO to Pinpoint Test HC .    		 RECONNECT the vacuum hose.
    GO to  DD3.
  3. DD3 CHECK THE VREF VOLTAGE TO FRPT SENSOR 
    • FRPT Sensor connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) FRPT Sensor Connector, Harness Side ( - ) FRPT Sensor Connector, Harness Side
      VREF - Pin 2 SIGRTN - Pin 4

    Is the voltage between 4 V - 6 V? 

    Yes No
    Key in OFF position.
    For DTC P0190, GO to  DD10.
    For DTC P0192, GO to  DD4.
    For DTC P0193, GO to  DD6.    		 Key in OFF position.
    GO to Pinpoint Test C .
  4. DD4 INDUCE A HIGH VOLTAGE ON THE FRP CIRCUIT 
    • Connect a 5 amp fused jumper wire between the following:
      Point A FRPT Sensor Connector, Harness Side Point B FRPT Sensor Connector, Harness Side
      FRP - Pin 1 VREF - Pin 2
    • Key ON, engine OFF.
    • Access the PCM and monitor the FRP V PID.

    Is the voltage greater than 4.75 V? 

    Yes No
    Key in OFF position. INSTALL a new FRPT sensor. Key in OFF position.
    REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC. REMOVE the jumper wire.
    GO to Pinpoint Test HC . GO to  DD5.
  5. DD5 CHECK THE FRP CIRCUIT FOR A SHORT TO SIGRTN AND GND IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) FRPT Sensor Connector, Harness Side ( - ) FRPT Sensor Connector, Harness Side
      FRP - Pin 1 SIGRTN - Pin 4
    • Measure the resistance between:
      ( + ) FRPT Sensor Connector, Harness Side ( - ) Vehicle Battery
      FRP - Pin 1 Negative terminal

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DD24. REPAIR the short circuit.
  6. DD6 INDUCE A LOW VOLTAGE ON THE FRP CIRCUIT 
    • Connect a 5 amp fused jumper wire between the following:
      Point A FRPT Sensor Connector, Harness Side Point B FRPT Sensor Connector, Harness Side
      FRP - Pin 1 SIGRTN - Pin 4
    • Key ON, engine OFF.
    • Access the PCM and monitor the FRP V PID.

    Is the voltage less than 0.1 V? 

    Yes No
    Key in OFF position. INSTALL a new FRPT sensor.
    REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.
    GO to Pinpoint Test HC .    		 Key in OFF position.
    GO to  DD7.
  7. DD7 CHECK THE FRP CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) FRPT Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      FRP - Pin 1 FRP - Pin E27

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  DD8. REPAIR the open circuit.
  8. DD8 CHECK THE FRP CIRCUIT FOR A SHORT TO VREF 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) PCM Connector, Harness Side
      VREF - Pin E40 FRP - Pin E27

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DD9. REPAIR the short circuit.
  9. DD9 CHECK THE FRP CIRCUIT FOR A SHORT TO PWR IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) FRPT Sensor Connector, Harness Side ( - )
      FRP - Pin 1 Ground

    Is any voltage present? 

    Yes No
    Key in OFF position. REPAIR the short circuit to PWR. GO to  DD24.
  10. DD10 CONTINUOUS MEMORY DTCS P0192 AND P0193: CHECK THE FRP CIRCUIT FOR AN INTERMITTENT CONCERN 
    NOTE: Repair any fuel pump DTCs prior to this test.
    NOTE: The FRP can vary from 275 - 485 kPa (40 - 70 psi).
    • Key ON, engine OFF.
    • Access the PCM and monitor the FRP V and FRP PIDs.
    • Carefully wiggle all accessible wiring and connectors associated with the circuit and look for a change in the PID state.

    Is a fault indicated during the wiggle test? 

    Yes No
    Key in OFF position. Key in OFF position.
    REPAIR as necessary. GO to Pinpoint Test Z .
  11. DD11 DTC P0191: CHECK FOR FUEL PUMP DRIVER MODULE (FPDM) DTCS 
    • Check for self-test DTCs.

    Are DTCs P1233, P1235 or P1237 present? 

    Yes No
    DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS . GO to  DD12.
  12. DD12 INSPECT ALL THE VACUUM HOSES CONNECTED TO THE INTAKE MANIFOLD FOR LEAKS 
    • Key in OFF position.
    • FRPT Sensor connector connected.
    • Key ON, engine running.
    • Allow the engine idle to stabilize.
    • Inspect all the vacuum hoses connected to the intake manifold for leaks.

    Are any vacuum hose concerns present? 

    Yes No
    ISOLATE the fault and REPAIR as necessary. GO to  DD13.
  13. DD13 CHECK THE FRPT CONNECTOR FOR DAMAGE OR CORROSION 
    • Key in OFF position.
    • FRPT Sensor connector disconnected.
    • Inspect the sensor, wiring, and connector for damage, corrosion, or water intrusion.

    Is a concern present? 

    Yes No
    REPAIR as necessary. GO to  DD14.
  14. DD14 CHECK THE FRP PID 
    NOTE: The fuel pressure is likely to increase after the fuel pressure is relieved with the system closed. The rate and amount of the fuel pressure increase is dependent upon the ambient air and fuel temperatures.
    NOTE: Prepare to record the FRP PID value within 5 seconds after the engine is shut off and also after the fuel pressure is relieved.
    • FRPT Sensor connector connected.
    • Key ON, engine running.
    • Allow the engine idle to stabilize.
    • Access the PCM and monitor the FRP PID.
    • Key in OFF position.
    • Key ON, engine OFF.
    • Record the FRP PID value within 5 seconds of the key off.
    • Relieve the fuel pressure. Refer to the FUEL SYSTEM PRESSURE RELEASE procedure.
    • Disable the fuel pump.
    • Key ON, engine OFF.
    • Record the FRP PID value within 5 seconds of completing the fuel system pressure release procedure.

    Is the difference between the recorded FRP PID values greater than 34 kPa (5 psi)? 

    Yes No
    GO to Pinpoint Test HC . GO to  DD15.
  15. DD15 COMPARE THE FRP PID TO THE MECHANICAL GAUGE 
    NOTE: Most mechanical gauges are referenced to atmospheric pressure. The FRPT sensor is referenced to manifold pressure. In order to make a valid comparison, the engine must be off.
    NOTE: The vehicle may exhibit a long crank until the fuel system is pressurized.
    • Key in OFF position.
    • Connect a mechanical fuel pressure gauge.
    • Key ON, engine OFF.
    • Monitor the mechanical gauge.
    • Access the PCM and monitor the FRP PID.
    • Compare the FRP PID value to the mechanical gauge.
    • Key in OFF position.
    • Pressurize the fuel system. Refer to the FUEL SYSTEM PRESSURE RELEASE procedure.
    • Key ON, engine running.
    • Allow the fuel pressure to stabilize.
    • Key in OFF position.
    • Key ON, engine OFF.
    • Compare the FRP PID value to the mechanical gauge.

    Are the FRP PID values within 34 kPa (5 psi) of the mechanical gauge readings? 

    Yes No
    GO to  DD24. INSTALL a new FRPT sensor.
    REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.
    GO to Pinpoint Test HC .
  16. DD16 KOEO AND KOER DTCS P0182 OR P0183: CHECK THE RESISTANCE OF THE FRPT SENSOR 
    • Key in OFF position.
    • FRPT Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) FRPT Sensor Connector, Component Side ( - ) FRPT Sensor Connector, Component Side
      FRT - Pin 3 SIGRTN - Pin 4

    Is the resistance between 2K ohms - 96k ohms? 

    Yes No
    GO to  DD17. INSTALL a new FRPT sensor.
    REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.
    GO to Pinpoint Test HC .
  17. DD17 CHECK THE FRPT FOR INTERNAL SHORTS 
    • Measure the resistance between:
      ( + ) FRPT Sensor Connector, Component Side ( - )
      FRT - Pin 3 Ground
    • Measure the resistance between:
      ( + ) FRPT Sensor Connector, Component Side ( - ) FRPT Sensor Connector, Component Side
      FRT - Pin 3 FRP - Pin 1
      FRT - Pin 3 VREF - Pin 2

    Are the resistances greater than 10K ohms? 

    Yes No
    For DTC P0182, GO to  DD18.
    For DTC P0183, GO to  DD20.    		 INSTALL a new FRPT sensor.
    REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.
    GO to Pinpoint Test HC .
  18. DD18 CHECK THE FRT CIRCUT(S) FOR A SHORT TO SIGRTN OR GND IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) PCM Connector, Harness Side
      FRT - Pin E6 SIGRTN - Pin E41
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - )
      FRT - Pin E6 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DD19. REPAIR the short circuit.
  19. DD19 INDUCE A HIGH VOLTAGE ON THE FRT CIRCUIT 
    • PCM connector connected.
    • Key ON, engine OFF.
    • Access the PCM and monitor the FRT V PID.

    Is the voltage greater than 4.5 V? 

    Yes No
    Unable to identify the fault at this time.
    GO to Pinpoint Test Z .    		 GO to  DD24.
  20. DD20 CHECK THE FRT AND SIG RTN CIRCUIT(S) FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) FRPT Sensor Connector, Harness Side
      FRT - Pin E6 FRT - Pin 3
      SIGRTN - Pin E41 SIGRTN - Pin 4

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DD21. REPAIR the open circuit.
  21. DD21 CHECK THE FRT SIGNAL FOR A SHORT TO VREF AND FRP 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) PCM Connector, Harness Side
      FRT - Pin E6 VREF - Pin E40
      FRT - Pin E6 FRP - Pin E27

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  DD22. REPAIR the short circuit.
  22. DD22 INDUCE A LOW VOLTAGE ON THE FRT CIRCUIT 
    • PCM connector connected.
    • Connect a 5 amp fused jumper wire between the following:
      Point A FRPT Sensor Connector, Harness Side Point B FRPT Sensor Connector, Harness Side
      FRT - Pin 3 SIGRTN - Pin 4
    • Key ON, engine OFF.
    • Access the PCM and monitor the FRT V PID.

    Is the voltage less than 0.2 V? 

    Yes No
    Unable to identify the fault at this time.
    GO to Pinpoint Test Z .    		 GO to  DD24.
  23. DD23 CONTINUOUS MEMORY DTCS P0182 OR P0183: INTERMITTENT CHECK 
    NOTE: The PID referred to below may read as EFT on some diagnostic tools.
    • Key ON, engine OFF.
    • Access the PCM and monitor the FRT V PID.
    • While observing the PID, carry out the following:
      • Tap on the sensor to simulate road shock.
      • Wiggle the sensor connector.
      • Wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM.
    • Check the FRPT and the PCM connectors for damage and corrosion.

    Is a concern present? 

    Yes No
    ISOLATE the fault and REPAIR as necessary. DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  24. DD24 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins.
      • corrosion.
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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