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Home >> Mazda >> 1999 >> B2500 SX, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Self-Diagnostics - EEC-V - 6.8L (99S E Series & 99S F350 To F550)) >> System Tests >> Test Kc: Fuel Shutoff Valve Relay >> Diagnostic Aids

Diagnostic Aids

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

Fig 1: Identifying Fuel Shutoff System Circuits (Crown Victoria)
G99F02643Courtesy of FORD MOTOR CO.
Fig 2: Identifying Fuel Shutoff System Circuits (Econoline & Pickup)
G99H02644Courtesy of FORD MOTOR CO.
NOTE: Fuel Shutoff Valve (FSV) relay is also referred to as fuel valve relay.

  1. 1) KOEO & KOER DTC P0230

    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.
    NOTE: Fuel Shutoff Valve (FSV) relay is also referred to as fuel valve relay.

    Turn ignition off. Disconnect Fuel Shutoff Valve (FSV) relay connector. Relay is located in left front of engine compartment, in battery junction box. Turn ignition on. Measure voltage between VPWR terminal at FSV relay wiring harness connector and chassis ground. See Fig 1 or Fig 2 . 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. NOTE: To identify FSV relay terminals, refer to numbers molded on relay.

  2. 2) Check FSV Relay
    Turn ignition off. Measure resistance between terminals No. 85 and 86 at FSV relay. Resistance should be 40-120 ohms. Also measure resistance between terminal No. 85 and terminals No. 30 and 87 at FSV relay. Resistance should be more than 10,000 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 Power

    Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition on. Measure voltage between FSV terminal at FSV relay wiring harness connector and chassis ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in FSV circuit.

  4. 4) Check FSV Circuit For Short To Ground

    Turn ignition off. Disconnect scan tool from Data Link Connector (DLC). Measure resistance between FSV terminal at FSV relay wiring harness connector and chassis ground. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in FSV circuit.

  5. 5) Check For Open FSV Circuit

    Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Measure resistance between FSV terminal at FSV relay wiring harness connector and PCM connector pin No. 80. If resistance is 5 ohms or more, repair open 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.

  6. 6) Check PCM FSV Circuit

    Reconnect PCM connector and FSV relay. Connect scan tool to DLC. Turn ignition on. Using scan tool, select FSVF PID from PID/DATA monitor menu. If PID value indicates YES, replace PCM. If PID value indicates NO, go to next step.

  7. 7) Check FSV Primary Circuit

    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. While cranking engine, observe FSVF PID value. If PID value indicates YES during cranking, replace PCM. If 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 next step.
    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.
    8. NOTE: Fuel Shutoff Valve (FSV) relay is also referred to as fuel pump relay.

  8. 10) KOEO & KOER DTC P0232
    This DTC indicates PCM detected high FSVM circuit voltage when fuel shutoff valves were commanded off. Attempt to start engine. If engine starts, go to next step. If engine does not start, go to step  15).

  9. 11) Check Power To FSV PWR Circuit

    Turn ignition and all accessories off. Disconnect scan tool. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition on. Measure voltage between PCM connector pin No. 40 (FSVM) and ground. 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 off. Disconnect FSV relay. Turn ignition on. Measure voltage between PCM connector pin 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 power in FSVM or FSV PWR circuit.

  11. 13) Check for Open FSVM Circuit

    Turn ignition off. Disconnect FSV relay. Measure resistance between PCM connector pin No. 40 and FSV PWR terminal at FSV relay wiring harness connector. 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 off. Disconnect Inertia Fuel Shutoff (IFS) switch. Measure resistance between terminals "C" and NC at IFS switch wiring harness connector. 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 Circuit Continuity

    Disconnect FSV relay. Measure resistance of FSV PWR circuit between FSV relay wiring harness connector and IFS wiring harness connector. 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 FSV PWR circuit between IFS switch and FSVM connection.

  14. 17) Check FSV PWR Circuit Resistance

    Measure resistance of FSV PWR circuit to fuel solenoid shutoff valves between IFS wiring harness connector and chassis ground. If resistance is less than 10 ohms, fault cannot be identified at this time. Verify previous test step results. If resistance is 10 ohms or more, repair open FSV PWR circuit.
    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

    This DTC indicates a fuel shutoff valve secondary circuit fault. If DTC P0230 is also present and not been diagnosed, go to step  1). Attempt to start engine. If engine starts, replace PCM. If engine does not start, go to next step.

  16. 21) Check B+ To Fuel Shutoff Valve (FSV) Relay

    Turn ignition off. Disconnect FSV relay wiring harness connector. Measure voltage between chassis ground and B+ terminal at FSV relay wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check 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 Resistance

    Measure resistance between negative battery terminal and FSV PWR terminal at FSV relay wiring harness connector. 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

    If Continuous Memory DTC P0230 is also present, go to step  40). Turn ignition off. Connect scan tool to Data Link Connector (DLC). Using scan tool, select FSVM PID. PID value should indicate OFF. Observe PID value for indication of fault performing the following:
    • Wiggle and bend FSV PWR circuit between FSV relay and fuel solenoid shutoff valves.
    • Wiggle and bend fuel shutoff valve ground circuits.
    • 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.
    • Check connectors for clean tight connection.

    Fault will be indicated by FSVM PID indicating ON. 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 .

    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

    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 Fuel Shutoff Valve (FSV) relay.
    • FSV relay contacts open.
    • Open in FSV PWR circuit.

    Turn ignition off. Disconnect Inertia Fuel Shutoff (IFS) switch. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect a jumper wire between PCM connector pins No. 77 and 80. Connect DVOM between PCM connector pins No. 40 and 51. Turn ignition on. Voltage should be more than 10 volts. Observe DVOM for indication of fault while performing the following:

    • Wiggle and bend B+ circuit to Fuel Shutoff Valve (FSV) relay.
    • Wiggle and bend FSV PWR circuit between FSV relay and FSVM circuit splice.
    • Lightly tap on FSV relay to simulate road shock.
    • Check connectors for clean tight connection.

    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 .

    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

    This DTC indicates a fuel shutoff valve primary circuit fault. Possible causes for this fault are:
    • Open VPWR circuit to Fuel Shutoff Valve (FSV) relay.
    • Open coil in FSV relay.
    • Open in FSV circuit.

    Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on and wait 5 seconds. Using scan tool, select FSVF PID from PID/DATA monitor menu. Observe PID value for indication of fault while performing the following:

    • Wiggle and bend FSV circuit between PCM connector pin No. 80 and FSV relay.
    • Wiggle and bend VPWR circuit PCM power relay and FSV relay.
    • Lightly tap on FSV relay to simulate road shock.
    • Check connectors for clean tight connection.

    Fault will be indicated if FSVF PID switches to 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 .

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