Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Ford >> 2002 >> Focus SVT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System Tests FD Through KA - EEC-V - Gasoline & NGV >> Test HB: Natural Gas Fuel Delivery System >> Testing

Test HB: Natural Gas Fuel Delivery System: Testing

NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION  table of fault code setting condition.
FAULT CODE SETTING CONDITION

Fault Code KOEO KOER Continuous Memory
P1180      HB17
P1181      HB17
    WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  1. 1) Check System Integrity
    Turn ignition switch to ON position for 5 seconds. Turn ignition switch to OFF position. Inspect fuel system for leaks, damaged or kinked hoses. See Figure or Figure . Inspect wiring harness for damage or loose connectors. Ensure vehicle has followed maintenance schedule. Ensure the following conditions are met:
    • Fuel Filter Element Is Okay
    • Inertia Fuel Shutoff (IFS) Is Set
    • Battery Is Fully Charged
    • Fuel System Fuses Are Okay

    Repair concerns as necessary. If vehicle exhibits poor fuel economy, perform fuel system pressure release procedure under FUEL SYSTEM VENTING in appropriate REMOVAL, OVERHAUL & INSTALLATION article. For a fuel smell symptom, go to step  16). For all other symptoms, go to next step.

  2. 2) Check Fuel Tank Pressure

    Turn ignition switch to OFF position. Install Filler Neck Venting Tool and Fuel Pressure Gauge from Fuel Delivery System Special Tool Kit (134-00114) to vehicle fueling connector. Open by-pass valve, located on fill valve. Refer to FUEL TANK VENTING procedure under COMPRESSED NATURAL GAS FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM VENTING in appropriate REMOVAL, OVERHAUL & INSTALLATION article. Turn ignition switch to ON position. Record fuel tank pressure. If fuel pressure reading is more than 500 psi (3448 kPa), turn ignition switch to OFF position. Close by-pass valve. Remove fuel tank venting tool and go to step  5). If fuel pressure is 500 psi (3448 kPa) or less, turn ignition switch to OFF position. Check fuel level. Add fuel to tank if necessary. If fuel level is okay, check for power at tank solenoid valve. Go to next step.
    3. NOTE: When energized by scan tool, FSV PWR circuit to fuel tank solenoid shutoff valve will remain ON for only 7 seconds.

  3. 3) Check FSV PWR & GND Circuits To Fuel Tank Solenoid Shutoff Valve
    Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, enter OUTPUT TEST MODE. Select ALL ON. Using a DVOM, measure voltage between FSV PWR and GND circuits at fuel tank solenoid shutoff valve harness connector. See WIRING DIAGRAMS article. Fuel tank solenoid shutoff valve is located on fuel tank (one per tank). If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, perform appropriate UNABLE TO VENT FUEL TANKS OR FUEL LINES diagnostic procedures under FUEL SYSTEM (NATURAL GAS VEHICLES) in appropriate SYSTEM & COMPONENT TESTING article to check for faulty fuel tank solenoid shutoff valve. Replace as necessary.

  4. 4) Check For Open GND Circuit To Fuel Tank Solenoid Shutoff Valve

    Using a DVOM, measure resistance between negative battery terminal and GND circuit at fuel tank solenoid shutoff valve harness connector. If resistance is less than 5 ohms, repair open in FSV PWR circuit to fuel tank solenoid shutoff valve. Verify symptom is no longer present. If resistance is 5 ohms or more, repair open in GND circuit to fuel tank solenoid shutoff valve. Verify symptom is no longer present.
    5. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  5. 5) Check Fuel Pressure
    Connect Fuel Pressure Gauge supplied in fuel delivery system special tool kit to Schrader valve located on fuel rail. If Schrader valve is not available on fuel rail, use scan tool and access FRP PID from PID/DATA MONITOR & RECORD menu. Release fuel pressure in fuel injection rail and fuel supply lines. See appropriate FUEL SYSTEM PRESSURE RELEASE procedure under FUEL SYSTEM VENTING in appropriate REMOVAL, OVERHAUL & INSTALLATION article. Turn ignition switch to ON position, or start engine (if possible). Turn ignition switch to OFF position. Wait 2 minutes and check fuel pressure using fuel pressure gauge or scan tool. If fuel pressure is 80-120 psi (552-827 kPa), go to next step. If fuel pressure is not 80-120 psi (552-827 kPa), replace fuel pressure regulator. Verify symptom is no longer present.
    6. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  6. 6) Check Fuel Rail Pressure Sensor Accuracy
    Turn ignition switch to OFF position. Connect fuel pressure gauge with vent hose supplied in fuel delivery system special tool kit to Schrader valve located on fuel rail. Turn ignition switch to ON position. Using scan tool, access FRP PID from PID/DATA MONITOR & RECORD menu. Record FRP PID pressure reading. Observe and record fuel pressure reading at fuel pressure gauge. Turn ignition switch to OFF position. Slowly open shutoff valve on fuel pressure gauge and bleed fuel pressure down to 50-70 psi (345-483 kPa). Remove fuel pump relay. Turn ignition switch to ON position. Using scan tool, record FRP PID pressure reading. Observe and record fuel pressure reading at fuel pressure gauge.

    Turn ignition switch to OFF position. Compare fuel pressure readings taken with fuel pump relay installed and removed. If FRP PID reading is not constant and within 10 psi (69 kPa) of fuel pressure reading at fuel pressure gauge, go to next step. If FRP PID value is constant and within 10 psi (69 kPa) of fuel pressure reading at fuel pressure gauge, for no-start vehicles go to step  10), for all others diagnose by symptom. See SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE & NGV article.

    7. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  7. 7) Verify Fuel Rail Solenoid Shutoff Valve Opens
    Ensure fuel pressure gauge with vent hose supplied in Kit (134-00114) are connected to Schrader valve located on fuel rail. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, access OUTPUT TEST MODE. See OUTPUT TEST MODE under ADDITIONAL SYSTEM FUNCTIONS. Select ALL ON. Start and stop tests several times by toggling START/STOP button on scan tool. An audible click should be heard or felt from fuel rail solenoid shutoff valve when START/STOP button is cycled on scan tool. Turn ignition switch to OFF position. If fuel rail solenoid shutoff valve did not operate as specified, go to next step. If fuel rail solenoid shutoff valve operated correctly, replace FRP sensor. Verify symptom is no longer present.
    8. NOTE: When energized by scan tool, FSV PWR circuit to fuel rail solenoid shutoff valve will remain ON for only 7 seconds.

  8. 8) Check FSV PWR & GND Circuits To Fuel Rail Solenoid Shutoff Valve
    Turn ignition switch to ON position. Using scan tool, again access OUTPUT TEST MODE. See OUTPUT TEST MODE under ADDITIONAL SYSTEM FUNCTIONS. Select ALL ON and press START. Using a DVOM, measure voltage between FSV PWR and GND circuits at fuel rail solenoid shutoff valve harness connector. See WIRING DIAGRAMS article. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, replace fuel rail solenoid shutoff valve. Verify symptom is no longer present.

  9. 9) Check For Open GND Circuit To Fuel Rail Solenoid Shutoff Valve

    Using a DVOM, measure resistance between battery negative terminal and GND circuit at fuel rail solenoid shutoff valve harness connector. See WIRING DIAGRAMS article. If resistance is less than 5 ohms, repair open in FSV PWR circuit to fuel rail solenoid shutoff valve. If resistance is 5 ohms or more, repair open in GND circuit to fuel rail solenoid shutoff valve. Verify symptom is no longer present.
    10. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  10. 10) Verify Fuel Rail Solenoid Shutoff Valve Seals
    Ensure fuel pressure gauge with vent hose supplied in fuel delivery system special tool kit are connected to Schrader valve located on fuel rail. Release fuel pressure in fuel injector rail and supply lines. See appropriate FUEL SYSTEM PRESSURE RELEASE procedure under FUEL SYSTEM VENTING in appropriate REMOVAL, OVERHAUL & INSTALLATION article. Disconnect fuel rail solenoid shutoff valve harness connector at fuel rail. Crank engine for 3 seconds (DO NOT start engine). Turn ignition switch to OFF position and wait 2 minutes. Using scan tool, access FRP PID from PID/DATA MONITOR & RECORD menu. Turn ignition switch to ON position and record FRP PID value. If FRP PID value is less than 10 psi (70 kPa), go to next step. If FRP PID value is 10 psi (70 kPa) or more, replace fuel rail solenoid shutoff valve. Verify symptom is no longer present.
    11. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  11. 11) Verify Fuel Rail Solenoid Shutoff Valve Partially Opens
    Turn ignition switch to OFF position. Ensure fuel pressure gauge with vent hose supplied in fuel delivery system special tool kit are connected to Schrader valve located on fuel rail. Release fuel pressure in fuel injector rail and supply lines. See appropriate FUEL SYSTEM PRESSURE RELEASE procedure under FUEL SYSTEM VENTING in appropriate REMOVAL, OVERHAUL & INSTALLATION article. Ensure fuel rail solenoid shutoff valve harness connector is disconnected. Turn ignition switch to ON position, then to OFF position. Reconnect fuel rail solenoid shutoff valve harness connector. Turn ignition switch to ON position. Using scan tool, access FRP PID and record FRP PID value. Record fuel rail pressure reading shown on fuel pressure gauge. Compare FRP PID value to fuel pressure gauge reading. If FRP PID value is within 10 psi (70 kPa) of fuel pressure reading at Schrader valve on fuel rail, turn ignition switch to OFF position and go to next step. If FRP PID value is not within 10 psi (70 kPa) of fuel pressure reading at Schrader valve on fuel rail, replace fuel rail solenoid shutoff valve. Verify symptom is no longer present.
    12. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  12. 12) Verify Fuel Rail Solenoid Shutoff Valve Fully Opens
    Ensure fuel pressure gauge with vent hose supplied in fuel delivery system special tool kit are connected to Schrader valve located on fuel rail. Release fuel pressure in fuel injector rail and supply lines. See FUEL SYSTEM PRESSURE RELEASE procedure under FUEL SYSTEM VENTING in appropriate REMOVAL, OVERHAUL & INSTALLATION article. Disconnect fuel rail solenoid shutoff valve harness connector. Turn ignition switch to ON position, then to OFF position. Reconnect fuel rail solenoid shutoff valve harness connector. Turn ignition switch to ON position and immediately start engine. Increase engine speed to 2500 RPM while monitoring FRP PID value. Record fuel rail pressure reading shown on fuel pressure gauge. Compare FRP PID value to fuel pressure gauge reading. If FRP PID value is within 10 psi (70 kPa) of fuel pressure at Schrader valve on fuel rail, go to next step. If FRP PID value is not within 10 psi (70 kPa) of fuel pressure at Schrader valve on fuel rail, replace fuel rail solenoid shutoff valve. Verify symptom is no longer present.
    13. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  13. 13) Check Fuel Pressure With Engine Running
    Start engine and allow to idle. Using scan tool, access FRP PID from PID/DATA MONITOR & RECORD menu. Record FRP PID value at idle speed. Increase engine speed to 2500 RPM. Again, record FRP PID value. If FRP PID value at idle is 80-120 (552-827 kPa), and more than 80 psi (552 kPa) at 2500 RPM, turn ignition switch to OFF position and go to next step. If FRP PID value is not as specified, check for plugged fuel lines. Repair as necessary and retest. If fuel lines are okay, replace fuel pressure regulator. Verify symptom is no longer present.
    14. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  14. 14) Verify Regulator Thermostat
    Start engine and allow to idle. Allow engine to reach normal operating temperature. Using a thermometer or temperature probe, measure temperature at fuel pressure regulator coolant bowl or coolant outlet. If temperature is 59-140°F (15-60°C), turn ignition switch to OFF position and go to next step. If fuel pressure regulator coolant bowl temperature is less than 59°F (15°C), turn ignition switch to OFF position. Check coolant lines and coolant system for proper operation. Repair as necessary and retest. If coolant lines and system are okay, replace fuel pressure regulator. If fuel pressure regulator coolant bowl temperature is more than 140°F (60°C), turn ignition switch to OFF position. Replace fuel pressure regulator. Verify symptom is no longer present.
    15. WARNING: Always refer to safety procedures to reduce possibilty of injury. See FUEL SYSTEM SAFETY PRECAUTIONS .

  15. 15) Verify Fuel Injector Flow
    Turn ignition switch to ON position, then to OFF position. Using scan tool, access FRP PID from PID/DATA MONITOR & RECORD menu. Record initial FRP PID value. Connect Fuel Injector Tester from Fuel Delivery System Special Tool Kit (134-00114) to suspect fuel injector. Using scan tool, access pulse width of 200 milliseconds and activate fuel injector tester. Record final FRP PID value. Subtract final FRP PID value from initial FRP PID value to find fuel pressure drop. Repeat procedure for remaining fuel injectors. Fuel pressure drop should be 35-50 psi (241-345 kPa) and all injectors should be within 3 psi (20 kPa) of each other. If fuel injectors are not within specification, replace faulty fuel injector(s). If fuel injectors are within specification, no concern is indicated at this time. If symptom still exists, diagnose by symptom. See SYMPTOMS under TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE & NGV article.
    16. NOTE: If vehicle has sat for several hours with engine off, a slight NGV smell may be detected in and around intake manifold area. This is normal, as fuel injectors leak down from fuel rail to intake manifold over several hours.

  16. 16) Check For Fuel Leak
    Turn ignition switch to OFF position. Install fuel pressure gauge supplied in fuel delivery system special tool kit to Schrader valve located on fuel rail. Turn ignition switch to ON position. Fuel pressure should be more than 85 psi (586 kPa). Using Natural Gas Sniffer from fuel delivery system special tool kit, or by covering fuel system components, lines and joints with soapy water solution, check for fuel leaks. If no bubbles develop and/or sniffer does not detect a leak, fuel leaks cannot be found and testing is complete. If bubbles develop or sniffer senses a leak, isolate fault and repair or replace component as necessary.
    17. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  17. 17) Continuous Memory DTC P1180 & P1181: Check Fuel Pressure
    Inspect fuel lines, fuel regulator and fuel filter for leaks and restrictions. Repair as necessary. If no leaks or restrictions are found, go to next step.

  18. 18) Check Fuel Tank Pressure

    Connect scan tool to Data Link Connector (DLC). Place gearshift lever in "P" position. Start engine and allow to idle. Using scan tool, access TANKPR PID from NGVM PID/DATA MONITOR & RECORD menu. Record TANKPR PID value. Using scan tool, access FRP PID from PCM PID/DATA MONITOR & RECORD menu. Record FRP PID value. Locate approximate TANKPR PID value and determine PCM inferred pressure using PCM INFERRED PRESSURE SPECIFICATIONS  table. If PCM inferred pressure is plus or minus 22 psi of FRP PID value, no concern is indicated at this time. Service any other DTCs that are present. If PCM inferred pressure is not plus or minus 22 psi of FRP PID value, go to next step (for DTC P1180), or replace fuel pressure regulator (for DTC P1181).
    PCM INFERRED PRESSURE SPECIFICATIONS

    TANKPR PID Value - kPa PCM Inferred Pressure - psi
    2000 109
    3000 108.4
    4000 106.9
    5000 106.5
    6000 106
    7000 105.6
    8000 105
    9000 104.5
    10,000 103.4
    11,000 103
    12,000 102.5
    13,000 102.3
    14,000 101.8
    16,000 100.8
    17,000 99.8
    18,000 99.3
    19,000 99
    20,000 98.5
    21,000 97.5
    22,000 97.3
    23,000 96.3
    24,000 96
    26,000 96
    28,000 95.5
    30,000 94

  19. 19) Check Fuel Filter For Water Or Other Contamination

    Disassemble fuel filter and check for water or any other contamination. If contamination is present, clean contaminants from filter housing and replace filter. If no contamination is present, go to next step.

  20. 20) Check Fuel Line For Restriction

    Visually inspect all fuel lines for damage which may lead to restrictions and leakage. Repair as necessary. If all fuel lines are okay, replace fuel pressure regulator.
scientia non olet · About Mike's Workshop Manuals