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HOMESERVICE MANUALSMAZDA2006B4000 BASE, AUTOMATICREPAIR AND DIAGNOSISELECTRICALGAUGESTROUBLESHOOTING (INSTRUMENTATION/DRIVER INFORMATION)PINPOINT TEST 4: INACCURATE SPEEDOMETER READINGPOSSIBLE CAUSES
2006 Mazda B4000 Base, Automatic

Possible Causes

2006 Mazda B4000 Base, AutomaticSECTION Possible Causes
  • incorrect tire size
  • PCM
  • instrument cluster
INACCURATE SPEEDOMETER READING PINPOINT TEST REFERENCE

PINPOINT TEST 4 INACCURATE SPEEDOMETER READING
STEP INSPECTION ACTION
1 CHECK THE TIRES FOR CORRECT SIZE
  • Check for factory recommended tire size.
  • Are the tires the correct size? 
 Yes Go to next step.
No Install new tires as necessary. Test the system for normal operation.
2 CHECK THE INSTRUMENT CLUSTER PID
  • Connect the diagnostic tool.
  • Key ON.
  • Enter the following diagnostic mode on the diagnostic tool:
    • Instrument Cluster PID
  • Select and monitor the instrument cluster English/metric PID.
  • Does the PID read KPH for a KPH instrument cluster, or MPH for a MPH instrument cluster? 
 Yes If the speedometer operates correctly but is inaccurate, go to step 4.
If the speedometer is inoperative, see PINPOINT TEST 5: SPEEDOMETER/ODOMETER IS INOPERATIVE  .
No Go to next step.
3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
  • Disconnect all instrument cluster connectors.
  • Check for:
    • corrosion
    • pushed-out pins
  • Connect all instrument cluster connectors and make sure they seat correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present? 
 Yes Install a new instrument cluster. See INSTRUMENT CLUSTER . Test the system for normal operation.
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
4 CHECK FOR CORRECT PCM OPERATION
  • Disconnect the PCM connector.
  • Check for:
    • corrosion
    • pushed-out pins
  • Connect the PCM connector and make sure it seats correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present? 
 Yes Install a new PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . Test the system for normal operation.
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • 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.