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.
1994 Mazda B2300 SE, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Model Identification
- Introduction
- Self-Diagnostic System
- Quick Test
- Additional System Functions
- Service Code Reference
- Circuit Tests
- Notes
- How To Use Circuit Tests
- Circuit Test Aa - No Start (3.0L)
- Circuit Test Ab - No Start (2.3L)
- Circuit Test B - Checking Vehicle Battery
- Circuit Test C - Reference Voltage
- Circuit Test DA - Temperature Sensor Test (ECT & IAT)
- Circuit Test Dc - Mass Airflow (MAF) Sensor
- Circuit Test Dg - Knock Sensor (KS)
- Circuit Test DH - Throttle Position (TP) Sensor
- Circuit Test DL - DPFE Sensor & EVR Solenoid
- Circuit Test DN - EVP Sensor & EVR Solenoid
- Circuit Test DP - Vehicle Speed Sensor (VSS)
- Circuit Test Dr - Cylinder Identification (CID) Circuit
- Circuit Test FD - Brake On-Off (Boo) Switch
- Circuit Test Ff - Power Steering Pressure (PSP) Switch
- Circuit Test G - MAF/TP Sensor Fuel Injector Pulse Width Test
- Circuit Test H - Fuel Control
- Circuit Test Ha - Adaptive Fuel
- Circuit Test J - Fuel Pump Circuit (Relay & Inertia Switch)
- Circuit Test KA - EGR Vacuum Regulator (EVR) Solenoid
- Circuit Test Kb - Canister Purge (CANP) Valve
- Circuit Test KD - Canister Purge (CANP) Solenoid
- Circuit Test KE - Idle Air Control (IAC) Solenoid
- Circuit Test Km - WAC & A/C Demand Switch
- Circuit Test KP - Octane Adjust
- Circuit Test M - Dynamic Response Test
- Circuit Test Ml - Self-Test Output Or Mil
- Circuit Test NA - Ignition Diagnostic Monitor (IDM) - B3000
- Circuit Test NB - Ignition Diagnostic Monitor (IDM) - B2300
- Circuit Test Pa - Spark Timing Check - B3000
- Circuit Test PB - Spark Timing Check (B2300)
- Circuit Test QA - No Codes/Codes Not Listed
- Circuit Test QB - Continuous Memory Code 512
- Circuit Test QC - Output State Check Not Functioning
- Circuit Test S - System Check
- Circuit Test Ta - CPP Switch/PNP Switch
- Circuit Test TC - Transmission Solenoids
- Summary
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.