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.
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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 151 (ENGINE CONTROL SYSTEM (L3))
1999 Mazda 626 ES, 2.5 D, Standard
Section 151 (Engine Control System (L3))
1999 Mazda 626 ES, 2.5 D, StandardSECTION Section 151 (Engine Control System (L3))
WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Control System Component Location Index
- Control System Diagram
- Control System Wiring Diagram
- Pcm Removal/Installation
- Pcm Inspection
- Using The WDS Or Equivalent
- Without Using the SST
- Inspection Using An Oscilloscope (Reference)
- Pcm Replacement
- Clutch Switch Inspection
- Neutral Switch Inspection
- Power Steering Pressure (PSP) Switch Inspection
- Variable Tumble Control (VTC) Shutter Valve Switch Inspection
- Accelerator Pedal Position (App) Sensor Inspection
- Throttle Position (TP) Sensor Inspection
- Mass Air Flow (MAF) Sensor Inspection
- Intake Air Temperature (IAT) Sensor Inspection
- Engine Coolant Temperature (ECT) Sensor Removal/Installation
- Engine Coolant Temperature (ECT) Sensor Inspection
- Barometric Pressure (BARO) Sensor Inspection
- Manifold Absolute Pressure (Map) Sensor Inspection
- Knock Sensor (KS) Inspection
- Knock Sensor (KS) Removal/Installation
- Camshaft Position (CMP) Sensor Inspection
- Crankshaft Position (CKP) Sensor Inspection
- Crankshaft Position (CKP) Sensor Removal/Installation
- Heated Oxygen Sensor (Ho2S) Inspection
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.