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 234 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM 13B-MSP))ENGINE CONTROL SYSTEM OPERATION INSPECTIONFUEL INJECTOR OPERATION INSPECTIONFUEL INJECTOR (FS) (RS) OPERATION INSPECTION
1999 Mazda 626 ES, 2.5 D, Standard
Fuel Injector (FS) (RS) Operation Inspection
1999 Mazda 626 ES, 2.5 D, StandardSECTION Fuel Injector (FS) (RS) Operation Inspection
WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the WDS or equivalent to the DLC-2.
- Start the engine and let it at idle.
- Access the RPM PID.
- Verify that the fuel injector control wave is not outputted at the following PCM terminal. (See PCM
.)
- Terminal 2G (front rotor)
- Terminal 2D (rear rotor)
- If the fuel injector control signal is outputted, inspect the following and repair or replace defective parts.
- MAF sensor
- TP sensor
- IAT sensor
- Inspect the fuel injector control signal wave profile at the following PCM terminals while the RPM PID is 5,000 RPM or over.
(See PCM
.)
- Terminal 2G (front rotor)
- Terminal 2D (rear rotor)
- If not as specified, inspect the following and repair or replace defective parts.
Front rotor:
- Open circuit in wiring between fuel injector (FS) terminal A and main relay terminal C
- Open or short circuit in wiring between fuel injector (FS) terminal B and PCM terminal 2G
- Open or short internal circuit of fuel injector (FS)
Rear rotor:
- Open circuit in wiring between fuel injector (RS) terminal A and main relay terminal C
- Open or short circuit in wiring between fuel injector (RS) terminal B and PCM terminal 2D
- Open or short internal circuit or fuel injector (RS)
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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.