Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Mazda B2300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
System Tests: Notes
NOTE:
These test procedures are only to be performed when referenced from another procedure. DO NOT perform these tests unless referenced to do so.
GENERAL TEST INDEX
| Test | Used To Diagnose |
|---|---|
| VEHICLE REFERENCE VOLTAGE | VREF Malfunctions |
| TACHOMETER OUTOUT FAILURE | Clean Tachometer Output Malfunctions |
| MALFUNCTION INDICATOR LAMP | MIL Malfunctions |
| INTERMITTENT | Intermittent Concerns |
| FUEL DELIVERY SYSTEM | Fuel Delivery Concerns |
| POSITIVE CRANKCASE VENTILATION SYSTEM | PCV System |
| PCM POWER RELAY | Electronic Engine Control Power Relay Failure |
| CRANKSHAFT POSITION SENSOR | CKP Sensor, Harness & PCM Malfunctions |
| FUEL PUMP INSPECTION | Fuel Pump Function |
| FUEL LINE PRESSURE/FUEL PRESSURE HOLD INSPECTION | Fuel Line Pressure & Pressure Hold |
| FUEL INJECTOR INSPECTION | Fuel Injector Concerns |
| EGR VALVE | EGR Valve |
| EGR VACUUM REGULATOR | EGR Vacuum Regulator Solenoid |
| DIFFERENTIAL PRESSURE FEEDBACK EGR SENSOR | Differential Pressure Feedback EGR Sensor |
| NO START | No Start Condition |
| IGNITION SCOPE PINPOINT | Ignition Coil Malfunction & Misfires |
Factory Service Tools
Use the Manual With the Right Hardware
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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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