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HOMESERVICE MANUALSFORD2003WINDSTAR BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM TEST A THROUGH DU - CNG, FLEX-FUEL & GASOLINETEST DP: VEHICLE SPEED SENSOR/TRANSFER CASE SPEED SENSORTESTING
2003 Ford Windstar Base

Test DP: Vehicle Speed Sensor/Transfer Case Speed Sensor: Testing

2003 Ford Windstar BaseSECTION 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
P0500 1 3       DP30
P0500 2       DP1
P0501 3       DP1
P0503      DP20
P1500      DP20
P1501    DP15  
P1502 1       DP30
P1502 2       DP1
(1)
For pickup under 8500 GVW & 4WD Manual Shift-On-The-Fly.
(2)
For all Other vehicles.
(3)
For Excursion, Pickups 5.4L & 6.8L over 8500 GVW see FAULT CODE SETTING CONDITION .
    NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  1. 1) For Continuous Memory Only DTC P0500, P0501 & P1502: Check VSS Circuits For Open In Harness (VRS Type)
    DTCs P0500, P0501and P1502 indicate that PCM has detected an error in vehicle speed information received from Vehicle Speed Sensor (VSS), Transfer Case Speed Sensor (TCSS) or Anti-Lock Brake System (ABS) module. Possible causes for this fault are:
    • Open or short in VSS (+) or VSS (-) circuit.
    • Open in TCSS signal or TCSS signal return circuit.
    • Short to GND in VSS or TCSS circuit.
    • Short to PWR in VSS or TCSS circuit.
    • Open or short in VSC between PCM and appropriate control module.
    • Faulty wheel speed sensor(s).
    • Faulty wheel speed sensor(s) wiring harness.
    • Faulty module(s) connected to vehicle speed circuit.
    • Faulty transfer case, vehicle or wheel speed sensors.
    • Faulty drive mechanism for VSS or TCSS.

    Turn ignition switch to OFF position. Disconnect VSS connector. Disconnect PCM connector. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance of VSS(+) and VSS (-) circuits between PCM harness connector and VSS harness connector. See Figure and Figure . If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, repair open in affected VSS(+) or (-) circuit. Perform DRIVE CYCLES . Ensure OBD-II DRIVE CYCLE is performed to verify repair.

  2. 2) Check VSS Circuits For Shorts To Ground Or Power In Harness

    Using a DVOM, measure resistance between VSS(+) circuit, and PWR GND, VPWR and VSS(-) circuits at PCM harness connector. See WIRING DIAGRAMS . See Figure and Figure . If all resistance measurements are more than 5 ohms, go to next step. If any resistance measurement is 5 ohms or less, go to step .

  3. 3) Check VSS Resistance

    Using a DVOM, measure resistance between VSS terminals. If resistance is not 170-270 ohms, replace VSS. If resistance is 170-270 ohms, replace PCM.
    4. NOTE: For additional testing information, see DIAGNOSTIC AIDS .
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.