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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0500: Vehicle Speed Sensor Circuit - Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Verify Current Input Signal Status - Is Concern Intermittent Or Constant -  Connect WDS or equivalent to DLC-2. Start engine. Access VSS PID using WDS or equivalent.
    • Vehicle speed: 12.4 MPH
    • Vehicle speed: 24.8 MPH
    If PID readings are within specification, go to intermittent concern troubleshooting procedure. Refer to INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If PID reading are not within specification, go to next step.
  4. Inspect VSS Connector For Poor Connection -  Verify VSS connector is connected securely. If connection is okay, go to next step. If connector is loose, reconnect VSS harness connector securely. After repair, go to step  11.
  5. Inspect VSS -  Perform VSS inspection. Refer to VEHICLE SPEED SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If VSS is okay, go to next step. If VSS is faulty, replace VSS. After repair, go to step  11.
  6. Inspect VSS Circuit For Short To Power -  Turn ignition off. Disconnect VSS harness connector. See Fig 1. Turn ignition on, engine off. Measure voltage at following terminals:
    • VSS harness connector terminal "A"
    • VSS harness connector terminal "B"
    If voltage reading is not present at either terminal, go to next step. If any voltage reading is present, repair short circuit to power in suspected wire or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  11.
    Fig 1: Identifying VSS Circuits & Harness Connector Terminals
    G00221512Courtesy of MAZDA MOTORS CORP.
  7. Inspect VSS Circuit For Short To Ground -  Check for continuity between following terminals and body ground:
    • VSS harness connector terminal "A"
    • VSS harness connector terminal "B"
    If continuity is not present, go to next step. If continuity is present in either terminal, repair short circuit to ground in suspected wire or replace wire harness. After repair, go to step  11.
  8. Inspect VSS Circuits For Shorts -  Check for continuity between VSS harness connector terminals "A" and "B". See Fig 1. If continuity is not present, go to next step. If continuity is present, repair short circuit or replace wire harness. After repair, go to step  11.
  9. Inspect PCM Connector For Poor Connection -  Disconnect PCM harness connectors. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If malfunction is not present, go to next step. If any malfunction is present, repair suspected terminal or replace wire harness. After repair, go to step  11.
  10. Inspect VSS Circuit For Open Circuit -  Check for continuity between following terminals:
    • VSS harness connector terminal "A" and PCM harness connector terminal "2I"
    • VSS harness connector terminal "B" and PCM harness connector terminal "2L"
    If continuity is not present, repair open circuit in suspected wire or replace harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step. If continuity is present, check VSS pulse wheel for damage. If VSS pulse wheel damage is present, replace VSS pulse wheel. After repair, go to next step.
  11. Verify Trouble Shooting Of DTC P0500 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from PCM memory using WDS or equivalent. Warm up engine. Access RPM and LOAD PID using WDS or equivalent. Drive vehicle under following conditions for 18 seconds.
    • Engine speed: 2000 RPM or more
    • Gear: Gear is in position other than NEUTRAL
    • Load: 40 percent or more
    If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  12. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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