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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF-DIAGNOSTICS
1999 Mazda 626 ES, 2.5 D, Standard
Engine Controls - Self-Diagnostics
1999 Mazda 626 ES, 2.5 D, StandardSECTION Engine Controls - Self-Diagnostics
- Introduction
- Self-Diagnostic System
- Quick Test
- Additional System Functions
- Summary
- Diagnostic Trouble Code Identification Table
- Diagnostic Tests
- Notes
- DTC P0102: Mass Airflow (MAF) Sensor
- DTC P0103: Mass Airflow (MAF) Sensor
- DTC P0106: EGR Boost Sensor
- DTC P0107: EGR Boost Sensor
- DTC P0108: EGR Boost Sensor
- DTC P0112 Or P0117: Temperature Sensor Input Low (IAT Or ECT)
- DTC P0113, P0118, P1112 Or P1117: Temperature Sensor (IAT Or ECT)
- DTC P0122: Throttle Position (TP) Sensor Low Input
- DTC P0123: Throttle Position (TP) Sensor High Input
- DTC P0125: Excessive Time To Enter Closed Loop
- DTC P0133 Or P0153: Heated Oxygen Sensor (Low Response)
- DTC P0135, P0141, P0147 Or P0155: Heated Oxygen Sensor Heater
- DTC P0136, P1137 Or P1138: Fuel Control
- DTC P0142, P1143 Or P1144: Fuel Control
- DTC P0171, P0172, P0174, P0175, P1130, P1131, P1132, P1150, P1151 Or P1152: Fuel Control - Ho2S Not Switching
- DTC P0230: Fuel Pump Relay
- DTC P0300, P0301, P0302, P0303, P0304, P0305 Or P0306: Misfire Detection Monitor
- DTC P0320: Distributor Ignition
- DTC P0325: Knock Sensor (KS) Circuit
- DTC P0340: Camshaft Position (CMP) Sensor Circuit
- DTC P0400: EGR Flow Malfunction
- DTC P0420 Or P0421: Catalyst Efficiency Monitor & Exhaust Systems
- DTC P0442: Evaporative Emission System (Small Leak)
- DTC P0443: Evaporative Emission System
- DTC P0446: Evaporative Emission System
- DTC P0452: Evaporative Emission System
- DTC P0453: Evaporative Emission System
- DTC P0455: Evaporative Emission System (Large Leak)
- DTC P0460: Fuel Gauge Sender Unit
- DTC P0500: Vehicle Speed Sensor (VSS)
- DTC P0505, P1504 Or P1507: Idle Air Control (IAC) Valve
- DTC P0603 Or P0605: Powertrain Control Module Malfunction
- DTC P0703 Or P1703: Brake Switch Malfunction
- DTC P0704: Clutch Switch Input Circuit
- DTC P1001: Unable To Activate Self-Test/SCP Communication Error Code Not Listed
- DTC P1100: Mass Airflow (MAF) Sensor Intermittent
- DTC P1101: Mass Airflow (MAF) Sensor Out Of Range
- DTC P1116: ECT Sensor
- DTC P1120: Throttle Position (TP) Sensor Out Of Range (Low)
- DTC P1121: Throttle Position (TP) Sensor
- DTC P1124: Throttle Position (TP) Sensor Out Of Range
- DTC P1125: Throttle Position (TP) Sensor
- DTC P1127: Fuel Control
- DTC P1250: Fuel Pressure Regulator Control (FPRC) Solenoid
- DTC P1409: EGR Valve Malfunction
- DTC P1410: EGR Boost Solenoid Valve Stuck
- DTC P1450: EVAP Control System
- DTC P1451: Canister Drain Cut Valve (CDCV) Malfunction
- DTC P1460: Wot A/C Cut-Off (WAC)
- DTC P1460: Wot A/C Cut-Off (Continuous Memory)
- DTC P1464: A/C Demand Out Of Range
- DTC P1474 Or P1479: Fan Control (FC) Relay
- DTC P1474 Or P1479: Fan Control (FC) Relay (Continuous Memory)
- DTC P1487: EGR Boost Solenoid Valve Circuit
- DTC P1501: Vehicle Speed Sensor (VSS)
- DTC P1506: Idle Air Control (IAC) Valve
- DTC P1602: Immobilizer Unit To Pcm Communication
- DTC P1603 Or P1604: Code Word Or Key Id Number Not Registered In Pcm
- DTC P1621: Code Word Or Key Id Number Not Registered In Pcm
- DTC P1622: Key Id Number Does Not Match
- DTC P1623: Code Word Or Key Id Number Read/Write Error In Pcm
- DTC P1624: Immobilizer Communication Counter = 0
- DTC P1650: Power Steering Pressure (PSP) Switch
- DTC P1652: Power Steering Pressure (PSP) Switch
- DTC P1703: Brake Switch Out Of Range
- Diagnostic Test Z (Intermittent)
RENDER: 1.0x
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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.