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Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0500: Vehicle Speed Sensor Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to next step.
  2. Verify Current Input Signal Status - Is Concern Intermittent Or Constant -  Start engine. Using scan tool, access VS PID data. Drive vehicle at 12.4 and 24.8 MPH. If PID and vehicle speed does not match, go to next step. If PID and vehicle speed matches, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  3. Check Input/Output Check Mode -  Turn ignition on, engine off. Check for instrument cluster DTCs. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. If DTCs 10 or 12 are not present, go to next step. If DTCs 10 or 12 are present, diagnose and repair as necessary.
  4. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problems are found, go to next step. If any problems are found, repair as necessary. After repair, go to step  10.
  5. Inspect Cruise Control Module Connector -  Disconnect cruise control module 16-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problems are found, go to next step. If any problems are found, repair as necessary. After repair, go to step  10.
  6. Inspect Instrument Cluster Connector For Poor Connection -  Disconnect instrument cluster connectors. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problems are found, go to next step. If any problems are found, repair as necessary. After repair, go to step  10.
  7. Inspect Voltage -  Connect PCM 104-pin harness connector. Turn ignition on, engine off. Measure voltage at instrument cluster 20-pin harness connector terminal No. 3O (Green/Red wire). If 5 volts are not present, go to next step. If 5 volts are present, replace instrument cluster. After repair, go to step  10.
  8. Inspect Instrument Cluster Circuit For Open Circuit -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check continuity of Green/Red wire between PCM 104-pin harness connector terminal No. 58 and instrument cluster 20-pin harness connector terminal No. 3O. See Figure. If continuity is present, go to next step. If continuity is not present, repair open circuit in Green/Red wire. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  10.
  9. Inspect Instrument Cluster Circuit For Short To Ground -  Check continuity between instrument cluster harness connector 3O (Green/Red wire) and ground. If continuity is present, repair short circuit to ground in Green/Red wire between instrument cluster and PCM. Go to next step. If continuity is not present, replace instrument cluster. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0500 Completed -  Reconnect all connectors. Turn ignition on, engine off. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Using scan tool, access PID data for LOAD and RPM. Drive vehicle with LOAD PID at 40 percent or more and engine speed at 1800 RPM or more. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0500 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P0500 is not present, go to next step.
  11. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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