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.
2001 Mazda B2500 SE, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics
- Introduction
- Self-Diagnostic System
- Quick Test
- Additional System Functions
- Programming Pcm
- Summary
- Diagnostic Trouble Code Definitions
- System Tests
- How To Use System Tests
- Test A: No-Start/Vehicle Will Not Start
- Test B: EEC-V Power Relay
- Test C: Reference Voltage
- Test DA: Temperature Sensor Test (IAT, ECT & EOT)
- Test Db: Engine Fuel Temperature Sensor
- Test Dc: Mass Airflow Sensor
- Test Dd: Fuel Rail Pressure Sensor
- Test DF: Vehicle Speed Circuit Check
- Test Dg: Knock Sensor
- Test DH: Throttle Position Sensor
- Test DL: Cylinder Head Temperature Sensor
- Test Dm: Thermal Manifold Absolute Pressure Sensor
- Test DP: Vehicle Speed Sensor/Transfer Case Speed Sensor
- Test DQ: Barometric Pressure Sensor
- Test Dr: Camshaft Position Sensor
- Test DS: Air Conditioning Pressure Sensor
- Test DT: Power Steering Pressure Sensor
- Test DU: Intake Air Temperature 2
- Test FD: Brake Pedal Position Switch
- Test Ff: Power Steering Pressure Switch
- Test FH: Generator Load Input
- Test H: Fuel Control
- Test HC: Fuel Delivery System
- Test Hd: Misfire Detection Monitor
- Test He: EGR System
- Test Hf: Catalyst Efficiency Monitor & Exhaust Systems
- Test Hg: PCV System
- Test HK: Variable Cam Timing
- Test HM: Secondary Air Injection System
- Test HU: Air Intake System
- Test HX: Evaporative Emission Monitor & System
- Test HY: Generator/Regulator System
- Test JB: Secondary Ignition
- Test JD: Crankshaft Position Sensor
- Test JE: Integrated Ignition Coil Failure
- Test JF: Integrated Ignition Coil On Plug Failure
- Test JH: Tachometer Output Failure
- Test KA: Fuel Pump Relay
- Test Kb: Fuel Pump Driver Module
- Test Kc: Fuel Shutoff Valve Relay
- Test KD: Electric Exhaust Gas RECIRCULATION
- Test KE: Idle Air Control Valve
- Test KF: Fan Control Relay
- Test KH: Hydraulic Cooling Fan
- Test Km: Wot A/C Cut-Off
- Test KP: Charge Air Cooler Pump
- Test KQ: Thermostat Heater Control
- Test NB: Malfunction Indicator Light
- Test NC: Ignition Engine Speed Input Circuit
- Test ND: Engine Rpm/Vehicle Speed Limiter
- Test QA: Unable To Activate Self-Test/SCP Communication Error/DTC Not Listed
- Test QB: KOEO DTC P0603, P1605 Or KOEO, KOER & Continuous Memory DTC P1633
- Test QC: OBD-II Monitor Testing Not Complete; DTC P1000
- Test QD: DTC P1260
- Test Ta: Park/Neutral Position Or Clutch Pedal Position Switches
- Test Tb: Transmission Control Switch/Transmission Control Indicator Lamp
- TEST TG: 4x4 LOW RANGE
- Test Th: Reverse Switch
- Test TJ: Output Shaft Speed Sensor
- Test Z: Intermittent
- System Tests (Evaporative Emissions)
- Notes
- Canister Vent Solenoid Closing Procedure
- Evaporative Emissions System Leak Test
- Test A: DTC P0442: Small Leak Detected In EVAP System
- Test B: DTC P0455: Major Leak Or No Flow Detected In EVAP System Or DTC P1443: Very Small Or No Purge Flow Detected In EVAP System
- Test C: DTC P1450: Excessive Vacuum Detected In Fuel Tank
Factory Service Tools
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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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