1995 Mazda B3000 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

How To Use Trouble Code Charts

  1. Ensure all non-OBD-II related faults found while performing steps in BASIC TESTING article have been corrected. DO NOT  perform any test unless specifically instructed by a QUICK TEST procedure. Follow each test step in order until fault is found. DO NOT  replace any part unless directed to do so. When more than one diagnostic trouble code is retrieved, start with first code displayed.
  2. Tests ensure electrical circuits are okay before sensors or other components are replaced. Always test circuits for continuity between sensor and PCM. Test all circuits for short to power, opens or short to ground. Voltage Reference (VREF) and Voltage Power (VPWR) circuits should be tested with ignition on or as specified in TROUBLE CODE CHARTS.
  3. DO NOT  measure voltage or resistance at PCM. DO NOT  connect any test light unless specified in testing procedure. All measurements are made by probing rear of connector (wiring harness side). Isolate both ends of a circuit and turn ignition off when checking for shorts or continuity, unless instructed otherwise.
  4. Disconnect solenoids and switches from harness before measuring continuity and resistance or applying voltage. After each repair, check all component connections and repeat QUICK TEST.
  5. An open circuit is defined as a resistance reading of greater than 5 ohms. This specification tolerance may be too high for some items in OBD-II system. If resistance approaches 5 ohms, always clean suspect connector and coat it with protective dielectric silicone grease. A short is defined as a resistance reading of less than 10,000 ohms to ground, unless stated otherwise in TROUBLE CODE CHARTS.
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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.

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