Diagnostic Aids

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

• Fuel Shutoff Valve (FSV) Relay
• Inertia Fuel Shutoff (IFS) Switch
• Wiring Harness Circuits (B+, FSV, FSVM, GND, FSV PWR & VPWR). See Fig 1.
• Powertrain Control Module (PCM)

Fig 1: Identifying Fuel Shutoff System Circuits (Crown Victoria, Econoline & Pickup)

Courtesy of FORD MOTOR CO.

1. 1) KOEO & KOER DTC P0230: Check VPWR Voltage To FSV Relay
   
   This DTC indicates a fuel shutoff valve primary circuit failure has been indicated. Possible causes are:
   • Open Or Shorted Fuel Shutoff Valve (FSV) Circuit
   • Open VPWR Circuit To FSV Relay
   • Faulty FSV Relay
   • Faulty PCM

   Turn ignition switch to OFF position. Remove FSV relay. On Crown Victoria, FSV relay is located in left rear of engine compartment, in relay center. On Econoline and Pickup, FSV relay is located in left front of engine compartment, in battery junction box. On all models, turn ignition switch to ON position. Using a DVOM, measure voltage between negative battery terminal and FSV relay cavity No. 86 (VPWR circuit). See Figure and Fig 1 . If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit between PCM power relay and FSV relay.

2. 2) Check FSV Relay
   
   Turn ignition switch to OFF position. Using a DVOM, measure resistance between FSV relay terminals No. 85 and 86. See Figure. Resistance should be 40-120 ohms. Also, measure resistance between FSV relay terminal No. 85 and terminals No. 30 and 87. Resistance should be more than 10 k/ohms. If resistance is not as specified, replace FSV relay. If resistance is as specified, go to next step.
3. 3) Check FSV Circuit For Short To VPWR In Harness
   
   Ensure ignition switch is turned to OFF position. Disconnect PCM connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition switch to ON position. Using a DVOM, measure voltage between negative battery terminal and FSV relay cavity No. 85 (FSV circuit). If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to VPWR in FSV circuit.
4. 4) Check FSV Circuit For Short To Ground In Harness
   
   Turn ignition switch to OFF position. Disconnect scan tool from Data Link Connector (DLC). Using a DVOM, measure resistance between negative battery terminal and FSV relay cavity No. 85 (FSV circuit). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in FSV circuit.
5. 5) Check For Open FSV Circuit
   
   Ensure ignition switch is turned to OFF position and PCM connector is disconnected. Inspect connector for loose, damaged or corroded terminals. Using a DVOM, measure resistance of FSV circuit between FSV relay cavity No. 85 and PCM harness connector terminal No. 80. See Figure and Fig 1 . If resistance is 5 ohms or more, repair open in FSV circuit. If resistance is less than 5 ohms and KOEO DTC P0231 or P0232 is also present with DTC P0230, go to next step. If resistance is less than 5 ohms and specified DTCs are not present, replace PCM.
NOTE: Test steps  6) and  7) check FSV circuit in PCM. To perform, FSVF PID must be monitored with scan tool. FSVF PID will indicate NO when no fault is detected, and YES when a fault is detected.
6. 6) Check FSV Primary Circuit In PCM
   Reconnect PCM harness connector and FSV relay. Connect scan tool to DLC. Turn ignition switch to ON position. DO NOT start engine. Using scan tool, select FSVF PID from PID/DATA MONITOR & RECORD menu. If FSVF PID value indicates YES, replace PCM. If FSVF PID value indicates NO, go to next step.
7. 7) Check FSV Primary Circuit In PCM (While Cranking Engine)
   
   Ensure battery is fully charged. To perform this step, ensure scan tool is connected to a power source that is powered with key in START position (battery power). While cranking engine, observe FSVF PID value. If FSVF PID value indicates YES during cranking, replace PCM. If FSVF PID value indicates NO during cranking, FSV primary circuit is okay. If DTC P0231 is present, go to step  20). If DTC P0232 is present, go to step  10).
   NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 10). No test procedures have been omitted.
NOTE: Fuel Shutoff Valve (FSV) relay may also be referred to as fuel valve relay (Crown Victoria) or fuel pump relay (all others).
8. 10) KOEO & KOER DTC P0232: Check If Engine Starts
   This DTC indicates PCM detected high FSVM circuit voltage when fuel shutoff valves were commanded off. Possible causes are:
   • Inertia Fuel Shutoff (IFS) Switch Open Or Not Reset
   • Open Circuit Between Fuel Shutoff Valve (FSV) Relay & FSVM Connection To FSV PWR Circuit
   • Poor FSV Ground
   • Internal Open In FSV
   • FSV Secondary Circuits Shorted To VPWR
   • FSV Relay Contacts Always Closed
   • Open FSVM Circuit Between PCM & Connection To FSV PWR Circuit
   • Faulty PCM (Engine Will Start)

   Attempt to start engine. If engine starts, go to next step. If engine does not start, go to step  15).

9. 11) Check If VPWR Is Always Supplied To FSV PWR Circuit
   
   Turn ignition switch to OFF position. Ensure all accessories are off. Disconnect scan tool from DLC. Disconnect PCM connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition switch to ON position. Using a DVOM, measure voltage between ground and PCM harness connector terminal No. 40 (FSVM). If voltage is 1.5 volts or more, go to next step. If voltage is less than 1.5 volts, go to step  13).
10. 12) Check FSV Relay
    
    Turn ignition switch to OFF position. Remove FSV relay. On Crown Victoria, FSV relay is located in left rear of engine compartment, in relay center. On Econoline and Pickup, FSV relay is located in left front of engine compartment, in battery junction box. On all models, turn ignition switch to ON position. Using a DVOM, measure voltage between PCM harness connector terminal No. 40 (FSVM) and ground. If voltage is less than 1.5 volts, replace FSV relay. If voltage is 1.5 volts or more, repair short to VPWR in FSVM or FSV PWR circuit.
11. 13) Check FSVM Circuit Between PCM & FSV Relay For Open
    
    Turn ignition switch to OFF position. Remove FSV relay. On Crown Victoria, FSV relay is located in left rear of engine compartment, in relay center. On Econoline and Pickup, FSV relay is located in left front of engine compartment, in battery junction box. On all models, measure resistance between PCM harness connector terminal No. 40 and FSV relay cavity No. 87 (FSV PWR circuit). See Figure and Fig 1 . If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in FSVM circuit.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 15). No test procedures have been omitted.
12. 15) Check IFS Switch
    
    Turn ignition switch to OFF position. Disconnect Inertia Fuel Shutoff (IFS) switch. Ensure IFS switch is reset. Using a DVOM, measure resistance between IFS switch terminals (Dark Green/Yellow and Pink/Black wires in harness). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, reset or replace IFS switch.
13. 16) Check FSV PWR Circuit Between IFS Switch & FSV Relay For Open
    
    Remove FSV relay. On Crown Victoria, FSV relay is located in left rear of engine compartment, in relay center. On Econoline and Pickup, FSV relay is located in left front of engine compartment, in battery junction box. On all models, measure resistance of Dark Green/Yellow wire (FSV PWR circuit) between FSV relay cavity No. 87 and IFS switch harness connector. See Figure and Fig 1 . If resistance is less than 5 ohms, reconnect FSV relay and go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Yellow wire between IFS switch and FSVM connection.
14. 17) Check FSV PWR Circuit Resistance To Ground Through Fuel Shutoff Valves
    
    Using a DVOM, measure resistance of FSV PWR circuit to fuel solenoid shutoff valves between IFS harness connector and negative battery terminal. If resistance is less than 10 ohms, fault cannot be identified at this time. Verify previous test step results and go to appropriate symptom under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - CNG & GASOLINE article. If resistance is 10 ohms or more, repair open in FSV PWR circuit between IFS switch and common splice between fuel tank solenoid valves, or fuel rail cutoff solenoid valve. See WIRING DIAGRAMS article.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 17) to step 20). No test procedures have been omitted.
15. 20) DTC P0231: Check If Engine Starts
    
    This DTC indicates a Fuel Shutoff Valve (FSV) secondary circuit fault. Possible causes are:
    • Open B+ Circuit To FSV Relay
    • Open FSV PWR Circuit Between FSV Relay & Connection To FSVM Circuit
    • Faulty FSV Relay
    • Faulty PCM (Engine Will Start)

    If DTC P0230 is also present and has not been diagnosed, go to step  1) to check primary fuel shutoff valve circuit fault. Attempt to start engine. If engine does not start, go to next step. If engine starts, turn ignition switch to OFF position. Disconnect PCM connector and go to step  13).

16. 21) Check B+ Voltage To Fuel Shutoff Valve Relay
    
    Turn ignition switch to OFF position. Remove FSV relay. On Crown Victoria, FSV relay is located in left rear of engine compartment, in relay center. On Econoline and Pickup, FSV relay is located in left front of engine compartment, in battery junction box. On all models, measure voltage between negative battery terminal and FSV relay cavity No. 30 (B+ circuit). See Figure and Fig 1 . If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check B+ circuit fuse. If fuse is blown, check for short to ground in FSV PWR or B+ circuit. If fuse is okay, repair open in B+ circuit.
17. 22) Check FSV PWR Circuit For Open Between FSV Relay & FSVM Splice
    
    Using a DVOM, measure resistance between ground and FSV relay cavity No. 87 (FSV PWR circuit). If resistance is less than 10 ohms, replace FSV relay. If resistance is 10 ohms or more, repair open in FSV PWR circuit.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 30). No test procedures have been omitted.
18. 30) Continuous Memory DTC P0232: Check Harness For Open Or Short To VPWR
    
    If Continuous Memory DTC P0230 is also present, go to step  40). Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position, engine off. Using scan tool, select FSVM PID from PID/DATA MONITOR & RECORD menu. FSVM PID value should indicate OFF. Observe FSVM PID value for indication of fault while performing the following:
    • Shake, wiggle and bend FSV PWR circuit between FSV relay and fuel shutoff solenoid valves.
    • Shake, wiggle and bend fuel shutoff valve ground circuits.
    • Shake, wiggle and bend FSVM circuit between PCM and splice to FSV PWR circuit.
    • Lightly tap on Inertia Fuel Shutoff (IFS) switch to simulate road shock.

    A fault is indicated when FSVM PID value indicates ON (open or short to VPWR is detected). If any faults are found, isolate fault and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to TEST Z, step 1) .

    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 30) to step 35). No test procedures have been omitted.
19. 35) Continuous Memory DTC P0231: Check Fuel Shutoff Valves Secondary Circuits Between B+ Supply & FSVM Connection
    
    This DTC indicates that sometime during vehicle operation when fuel shutoff valves were commanded on, FSVM circuit voltage went low. Possible causes for this fault are:
    • Open B+ Circuit To FSV Relay
    • Open FSV PWR Circuit Between FSV Relay & Connection To FSVM Circuit
    • Faulty FSV Relay
    • Faulty PCM (Engine Will Start)

    Turn ignition switch to OFF position. Disconnect Inertia Fuel Shutoff (IFS) switch. Disconnect PCM connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect a jumper wire between PCM harness connector terminal No. 80 and ground. Connect DVOM between PCM harness connector terminal No. 40 and ground. Turn ignition switch to ON position. FSV relay should activate and voltage should be more than 10 volts. Observe DVOM for indication of fault while performing the following:

    • Shake, wiggle and bend B+ circuit to Fuel Shutoff Valve (FSV) relay.
    • Shake, wiggle and bend FSV PWR circuit between FSV relay and FSVM circuit splice.
    • Lightly tap on FSV relay to simulate road shock.
    • Check FSV relay connector for corrosion or damaged terminals.

    Fault will be indicated by sudden change in DVOM voltage. If any faults are found, isolate fault and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to TEST Z, step 1) .

    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 35) to step 40). No test procedures have been omitted.
20. 40) Continuous Memory DTC P0230: Check Fuel Shutoff Valve Primary Circuits
    
    This DTC indicates a fuel shutoff valve primary circuit fault. Possible causes for this fault are:
    • Open Or Shorted Fuel Shutoff Valve (FSV) Circuit
    • Open VPWR Circuit To FSV Relay
    • Faulty FSV Relay
    • Faulty PCM

    Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position and wait 5 seconds. Using scan tool, select FSVF PID from PID/DATA MONITOR & RECORD menu. FSVF PID should indicate NO (PCM detects VPWR through relay coil and FSV circuit at terminal No. 80). Observe FSVF PID value for indication of fault while performing the following:

    • Shake, wiggle and bend FSV circuit between PCM harness connector terminal No. 80 and FSV relay.
    • Shake, wiggle and bend VPWR circuit between PCM power relay and FSV relay.
    • Lightly tap on FSV relay to simulate road shock.
    • Check PCM and FSV relay connectors for clean tight connection.

    If a fault is detected (open circuit), FSVF PID will indicate YES. If any faults are found, isolate fault and repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to TEST Z, step 1) .